AMD: ''Nvidia are full of sh*t and asshurt''

[QUOTE="Bebi_vegeta"]

[QUOTE="tormentos"] I may regret this since Ron actually quote me allot to talk about something i did not say...but never the less.. We were able to enable PhysX on all graphics cards by editing the WillowEngine.ini and setting the PhysX level to 2. As far as we could tell the Radeon HD 7970 and GeForce GTX 680 look the same with PhysX set to high but admittedly we have not played a great deal of the game and ave only use a few guns. However the cloth effects and rock debris effects from shooting stuff with the Gearbox Rifle look the same. Furthermore all PhysX effects are offloaded to the CPU when using an AMD graphics card so depending on your processor the performance will vary quite a lot. As we were using the Core i7-3960X the hit wasnt nearly as significant as you will experience with a lesser processor. So yeah Physx can run on AMD GPU by just editing the WillowEngine.ini... http://www.techspot.com/review/577-borderlands-2-performance/page5.html And the result may shock you..:lol ^^^^^^ ""With PhysX set to high, the GTX 680 became 19% slower at 1920x1200, averaging just 60fps instead of 74fps. Surprisingly, the HD 7970 did slightly better dropping 15% from 72fps to 61fps, and as far as we could tell, the PhysX effects looked identical on both brand of cards. When using cards such as the GTX 560, we were still able to achieve playable performance with PhysX set to high despite a 17% dip in frame rate. The HD 6870 took a similar hit dropping 18% from 51fps to just 42fps, but this is probably a worthwhile tradeoff for many gamers."" :lol: Ron you ow me...ShadowriverUB

So is the GPU doing the work or the CPU ? Cause I want to know if PhysX is possible running on AMD gpu... like how Nvidia does it.

Again, I'm talking PhysX. Now... just clear as text tell me if AMD GPU can run it like Nvdia GPU.

[QUOTE="ronvalencia"][QUOTE="tormentos"] I may regret this since Ron actually quote me allot to talk about something i did not say...but never the less.. We were able to enable PhysX on all graphics cards by editing the WillowEngine.ini and setting the PhysX level to 2. As far as we could tell the Radeon HD 7970 and GeForce GTX 680 look the same with PhysX set to high but admittedly we have not played a great deal of the game and ave only use a few guns. However the cloth effects and rock debris effects from shooting stuff with the Gearbox Rifle look the same. Furthermore all PhysX effects are offloaded to the CPU when using an AMD graphics card so depending on your processor the performance will vary quite a lot. As we were using the Core i7-3960X the hit wasnt nearly as significant as you will experience with a lesser processor. So yeah Physx can run on AMD GPU by just editing the WillowEngine.ini... http://www.techspot.com/review/577-borderlands-2-performance/page5.html And the result may shock you..:lol ^^^^^^ ""With PhysX set to high, the GTX 680 became 19% slower at 1920x1200, averaging just 60fps instead of 74fps. Surprisingly, the HD 7970 did slightly better dropping 15% from 72fps to 61fps, and as far as we could tell, the PhysX effects looked identical on both brand of cards. When using cards such as the GTX 560, we were still able to achieve playable performance with PhysX set to high despite a 17% dip in frame rate. The HD 6870 took a similar hit dropping 18% from 51fps to just 42fps, but this is probably a worthwhile tradeoff for many gamers."" :lol: Ron you ow me...tormentos

AMD GPU doesn't run PhysX i.e. it would require

1. PTX to AMD IL translator.

2. PhysX ported to OpenCL.

PS; I was NVIDIA fanboy and played with programming the CUDA G8X.

[QUOTE="Bebi_vegeta"]

[QUOTE="tormentos"] I may regret this since Ron actually quote me allot to talk about something i did not say...but never the less.. We were able to enable PhysX on all graphics cards by editing the WillowEngine.ini and setting the PhysX level to 2. As far as we could tell the Radeon HD 7970 and GeForce GTX 680 look the same with PhysX set to high but admittedly we have not played a great deal of the game and ave only use a few guns. However the cloth effects and rock debris effects from shooting stuff with the Gearbox Rifle look the same. Furthermore all PhysX effects are offloaded to the CPU when using an AMD graphics card so depending on your processor the performance will vary quite a lot. As we were using the Core i7-3960X the hit wasnt nearly as significant as you will experience with a lesser processor. So yeah Physx can run on AMD GPU by just editing the WillowEngine.ini... http://www.techspot.com/review/577-borderlands-2-performance/page5.html And the result may shock you..:lol ^^^^^^ ""With PhysX set to high, the GTX 680 became 19% slower at 1920x1200, averaging just 60fps instead of 74fps. Surprisingly, the HD 7970 did slightly better dropping 15% from 72fps to 61fps, and as far as we could tell, the PhysX effects looked identical on both brand of cards. When using cards such as the GTX 560, we were still able to achieve playable performance with PhysX set to high despite a 17% dip in frame rate. The HD 6870 took a similar hit dropping 18% from 51fps to just 42fps, but this is probably a worthwhile tradeoff for many gamers."" :lol: Ron you ow me...ShadowriverUB

So is the GPU doing the work or the CPU ? Cause I want to know if PhysX is possible running on AMD gpu... like how Nvidia does it.

[QUOTE="tormentos"][QUOTE="Bebi_vegeta"]

So no ? Or should I look on google ?

Bebi_vegeta

So is the GPU doing the work or the CPU ? Cause I want to know if PhysX is possible running on AMD gpu... like how Nvidia does it.

[QUOTE="Bebi_vegeta"]

[QUOTE="tormentos"] I may regret this since Ron actually quote me allot to talk about something i did not say...but never the less.. We were able to enable PhysX on all graphics cards by editing the WillowEngine.ini and setting the PhysX level to 2. As far as we could tell the Radeon HD 7970 and GeForce GTX 680 look the same with PhysX set to high but admittedly we have not played a great deal of the game and ave only use a few guns. However the cloth effects and rock debris effects from shooting stuff with the Gearbox Rifle look the same. Furthermore all PhysX effects are offloaded to the CPU when using an AMD graphics card so depending on your processor the performance will vary quite a lot. As we were using the Core i7-3960X the hit wasnt nearly as significant as you will experience with a lesser processor. So yeah Physx can run on AMD GPU by just editing the WillowEngine.ini... http://www.techspot.com/review/577-borderlands-2-performance/page5.html And the result may shock you..:lol ^^^^^^ ""With PhysX set to high, the GTX 680 became 19% slower at 1920x1200, averaging just 60fps instead of 74fps. Surprisingly, the HD 7970 did slightly better dropping 15% from 72fps to 61fps, and as far as we could tell, the PhysX effects looked identical on both brand of cards. When using cards such as the GTX 560, we were still able to achieve playable performance with PhysX set to high despite a 17% dip in frame rate. The HD 6870 took a similar hit dropping 18% from 51fps to just 42fps, but this is probably a worthwhile tradeoff for many gamers."" :lol: Ron you ow me...tormentos

So is the GPU doing the work or the CPU ? Cause I want to know if PhysX is possible running on AMD gpu... like how Nvidia does it.

http://www.pcper.com/reviews/Graphics-Cards/Borderlands-2-PhysX-Performance-and-PhysX-Comparison-GTX-680-and-HD-7970/GPU-

UPDATE: I did finally get an answer from Gearbox about the slow downs we were seeing on the AMD results. Apparently when larger collections of PhysX simulations are running on the CPU, those threads can take quite a bit longer than they would when running on the GPU. As a result, the CPU (and rest of the game engine code) becomes "blocked" waiting for a single thread to finish, which results in the lower CPU utilization we saw on the AMD results as well as the lower overall performance. Because PhysX is an NVIDIA engine, even if Gearbox chose to they likely couldn't add in additional multi-threaded capabilities to the PhysX code path so the slow down here is likely to stay

7970 can render additional objects generated by the single thread PhysX CPU.

AMD GPU doesn't run PhysX i.e. it would require

1. PTX to AMD IL translator.

2. PhysX ported to OpenCL.

PS; I was NVIDIA fanboy and played with programming the CUDA G8X.

ronvalencia

[QUOTE="Bebi_vegeta"]

[QUOTE="tormentos"] I may regret this since Ron actually quote me allot to talk about something i did not say...but never the less.. We were able to enable PhysX on all graphics cards by editing the WillowEngine.ini and setting the PhysX level to 2. As far as we could tell the Radeon HD 7970 and GeForce GTX 680 look the same with PhysX set to high but admittedly we have not played a great deal of the game and ave only use a few guns. However the cloth effects and rock debris effects from shooting stuff with the Gearbox Rifle look the same. Furthermore all PhysX effects are offloaded to the CPU when using an AMD graphics card so depending on your processor the performance will vary quite a lot. As we were using the Core i7-3960X the hit wasnt nearly as significant as you will experience with a lesser processor. So yeah Physx can run on AMD GPU by just editing the WillowEngine.ini... http://www.techspot.com/review/577-borderlands-2-performance/page5.html And the result may shock you..:lol ^^^^^^ ""With PhysX set to high, the GTX 680 became 19% slower at 1920x1200, averaging just 60fps instead of 74fps. Surprisingly, the HD 7970 did slightly better dropping 15% from 72fps to 61fps, and as far as we could tell, the PhysX effects looked identical on both brand of cards. When using cards such as the GTX 560, we were still able to achieve playable performance with PhysX set to high despite a 17% dip in frame rate. The HD 6870 took a similar hit dropping 18% from 51fps to just 42fps, but this is probably a worthwhile tradeoff for many gamers."" :lol: Ron you ow me...tormentos

So is the GPU doing the work or the CPU ? Cause I want to know if PhysX is possible running on AMD gpu... like how Nvidia does it.

This is what I read...

Furthermore all PhysX effects are offloaded to the CPU when using an AMD graphics card so depending on your processor the performance will vary quite a lot. As we were using the Core i7-3960X the hit wasnt nearly as significant as you will experience with a lesser processor.

[QUOTE="tormentos"][QUOTE="clyde46"] Yet, Nvidia are ahead in the GPU wars. Chozofication

Actually the original Xbox had the absolute top of the line GPU from Nvidia at the time.  The only "downgrade" was a single digit clockspeed reduction, might have been less than 5mhz, can't remember.

The Xbox was the only console that could ever have such a GPU though because it was so huge...

[QUOTE="ronvalencia"]

AMD GPU doesn't run PhysX i.e. it would require

1. PTX to AMD IL translator.

2. PhysX ported to OpenCL.

PS; I was NVIDIA fanboy and played with programming the CUDA G8X.

tormentos

This is what I read...

 

Furthermore all PhysX effects are offloaded to the CPU when using an AMD graphics card so depending on your processor the performance will vary quite a lot. As we were using the Core i7-3960X the hit wasnt nearly as significant as you will experience with a lesser processor.

Bebi_vegeta

[QUOTE="Bebi_vegeta"]This is what I read...

Furthermore all PhysX effects are offloaded to the CPU when using an AMD graphics card so depending on your processor the performance will vary quite a lot. As we were using the Core i7-3960X the hit wasnt nearly as significant as you will experience with a lesser processor.

tormentos

7970 can render additional objects generated by the single thread PhysX CPU (based on Gearbox's statement).

What's need is PTX to AMD IL JIT translator or NVIDIA port PhysX to OpenCL.

[QUOTE="Bebi_vegeta"]This is what I read...

 

Furthermore all PhysX effects are offloaded to the CPU when using an AMD graphics card so depending on your processor the performance will vary quite a lot. As we were using the Core i7-3960X the hit wasnt nearly as significant as you will experience with a lesser processor.

tormentos

Then why did your own link say that ?

Furthermore all PhysX effects are offloaded to the CPU when using an AMD graphics card so depending on your processor the performance will vary quite a lot. As we were using the Core i7-3960X the hit wasnt nearly as significant as you will experience with a lesser processor.

[QUOTE="Bebi_vegeta"]

[QUOTE="tormentos"] I may regret this since Ron actually quote me allot to talk about something i did not say...but never the less.. We were able to enable PhysX on all graphics cards by editing the WillowEngine.ini and setting the PhysX level to 2. As far as we could tell the Radeon HD 7970 and GeForce GTX 680 look the same with PhysX set to high but admittedly we have not played a great deal of the game and ave only use a few guns. However the cloth effects and rock debris effects from shooting stuff with the Gearbox Rifle look the same. Furthermore all PhysX effects are offloaded to the CPU when using an AMD graphics card so depending on your processor the performance will vary quite a lot. As we were using the Core i7-3960X the hit wasnt nearly as significant as you will experience with a lesser processor. So yeah Physx can run on AMD GPU by just editing the WillowEngine.ini... http://www.techspot.com/review/577-borderlands-2-performance/page5.html And the result may shock you..:lol ^^^^^^ ""With PhysX set to high, the GTX 680 became 19% slower at 1920x1200, averaging just 60fps instead of 74fps. Surprisingly, the HD 7970 did slightly better dropping 15% from 72fps to 61fps, and as far as we could tell, the PhysX effects looked identical on both brand of cards. When using cards such as the GTX 560, we were still able to achieve playable performance with PhysX set to high despite a 17% dip in frame rate. The HD 6870 took a similar hit dropping 18% from 51fps to just 42fps, but this is probably a worthwhile tradeoff for many gamers."" :lol: Ron you ow me...ShadowriverUB

So is the GPU doing the work or the CPU ? Cause I want to know if PhysX is possible running on AMD gpu... like how Nvidia does it.

 

Then why did your own link say that ?

 

Furthermore all PhysX effects are offloaded to the CPU when using an AMD graphics card so depending on your processor the performance will vary quite a lot. As we were using the Core i7-3960X the hit wasnt nearly as significant as you will experience with a lesser processor.

Bebi_vegeta

[QUOTE="Bebi_vegeta"]

 

Then why did your own link say that ?

 

Furthermore all PhysX effects are offloaded to the CPU when using an AMD graphics card so depending on your processor the performance will vary quite a lot. As we were using the Core i7-3960X the hit wasnt nearly as significant as you will experience with a lesser processor.

tormentos

So you're saying he edited the InI file... yet, still stated it was dependent of the CPU when using a AMD card... ohhhhhhhhhkayyyyyyyyyyyyyyyyyyyy. Makes no sense... since it's not depending CPU for Nvidia but it's dependent CPU for AMD ?

It seems like he's saying he enable the PhysX by changing a InI file but the workload is done on the CPU.

This is very vague... More testing and explanation needed.

[QUOTE="Bebi_vegeta"]

Then why did your own link say that ?

Furthermore all PhysX effects are offloaded to the CPU when using an AMD graphics card so depending on your processor the performance will vary quite a lot. As we were using the Core i7-3960X the hit wasnt nearly as significant as you will experience with a lesser processor.

tormentos

Modifying the ini file doesn't mean it will do the said function.

[QUOTE="ShadowriverUB"][QUOTE="Bebi_vegeta"]

So is the GPU doing the work or the CPU ? Cause I want to know if PhysX is possible running on AMD gpu... like how Nvidia does it.

Bebi_vegeta

Again, I'm talking PhysX. Now... just clear as text tell me if AMD GPU can run it like Nvdia GPU.

[QUOTE="Bebi_vegeta"]

[QUOTE="ShadowriverUB"] Both, CUDA and aspecially OpenCL goal is to utilize both CPU and GPU and any other programmable processing unit that software any access to, to execute computing processes writen in single code, insted of making specialised code for specific kind of hardware. Even CUDA name tells you thet: ".Compute Unified Device Architecture"ShadowriverUB

Again, I'm talking PhysX. Now... just clear as text tell me if AMD GPU can run it like Nvdia GPU.

Maybe you should look at the beging of the argument lol...

[QUOTE="Bebi_vegeta"]

[QUOTE="ShadowriverUB"] Both, CUDA and aspecially OpenCL goal is to utilize both CPU and GPU and any other programmable processing unit that software any access to, to execute computing processes writen in single code, insted of making specialised code for specific kind of hardware. Even CUDA name tells you thet: ".Compute Unified Device Architecture"ShadowriverUB

Again, I'm talking PhysX. Now... just clear as text tell me if AMD GPU can run it like Nvdia GPU.

The theory for unified CPU and GPU via CUDA is sound, but there's politics i.e. you probably see it via NVIDIA ARM + CUDA combo i.e. NVIDIA's HSA that runs only on NVIDIA hardware.

[QUOTE="tormentos"][QUOTE="Bebi_vegeta"]

 

Then why did your own link say that ?

 

Furthermore all PhysX effects are offloaded to the CPU when using an AMD graphics card so depending on your processor the performance will vary quite a lot. As we were using the Core i7-3960X the hit wasnt nearly as significant as you will experience with a lesser processor.

ronvalencia

This thread is just getting silly :?

[QUOTE="ronvalencia"][QUOTE="tormentos"] Because that is what happen when you don't run physx on the GPU,and or when you have and non Nvidia card,but since he edited the InI file they actually bypass that let me give you another example.. Remember how Nvidia 7800GTX and 7900 GTX line could not do HDR+AA at the same time while AMD cards like the Xenos and X1900 could.? Remember how some geeks were actually enabling both on the 7900GTX by doing some file edits.?tormentos

This is different to PhysX running on AMD GPUs. Call me when NVIDIA ports PhysX to OpenCL or AMD IL or AMD HSA.

[QUOTE="ShadowriverUB"][QUOTE="Bebi_vegeta"]

Again, I'm talking PhysX. Now... just clear as text tell me if AMD GPU can run it like Nvdia GPU.

ronvalencia

Here is what you need to know. Nvidia is hurt. PhysX will run on PS4 no matter were. PhysX ran great on PS3. PhysX even ran on Wii and 360.. There are other Physics engines to like Havok, Oh and for the dude still doubting my link.. ""Although you may need an Nvidia card to max the game at 2560x1600 with more than 60fps, AMD's mid-range and high-end GPUs offered playable results at all three tested resolutions. Additionally, thanks to a mod, most Radeon owners will be able to enjoy Borderlands 2 in all its glory with PhysX enabled. In fact, based on our testing, Radeon cards seem to handle PhysX slightly better than their GeForce counterparts. When running Borderlands 2 at 1920x1200, the HD 7970 only took a 15% performance hit after enabling PhysX (dropping from 72fps to 61fps), whereas the GTX 680 fell 19% from 74fps to 60fps."" http://www.techspot.com/review/577-borderlands-2-performance/page7.html OWNED.... A mod allowed Radeons to run Physx it wasn't the CPU and Radeons card like the 7970 actually did better..tormentos

PhysX ran on PS3 but didn't have the full package... I'm pretty sure it's the same for the rest of the consoles if they even had any of said features.

Still doesn't explain why he mentionned it was CPU dependent when AMD card was used.... which is not mention when using Nvidia card.

Also, it's still very vague to see if all was rendered exactly the same... and this is one game only deal ?

So more tested is needed and better documenting aswell.

Here is what you need to know. Nvidia is hurt. PhysX will run on PS4 no matter were. PhysX ran great on PS3. PhysX even ran on Wii and 360.. There are other Physics engines to like Havok, Oh and for the dude still doubting my link.. ""Although you may need an Nvidia card to max the game at 2560x1600 with more than 60fps, AMD's mid-range and high-end GPUs offered playable results at all three tested resolutions. Additionally, thanks to a mod, most Radeon owners will be able to enjoy Borderlands 2 in all its glory with PhysX enabled. In fact, based on our testing, Radeon cards seem to handle PhysX slightly better than their GeForce counterparts. When running Borderlands 2 at 1920x1200, the HD 7970 only took a 15% performance hit after enabling PhysX (dropping from 72fps to 61fps), whereas the GTX 680 fell 19% from 74fps to 60fps."" http://www.techspot.com/review/577-borderlands-2-performance/page7.html OWNED.... A mod allowed Radeons to run Physx it wasn't the CPU and Radeons card like the 7970 actually did better..tormentos

This is different to PhysX running on AMD GPUs. Call me when NVIDIA ports PhysX to OpenCL or AMD IL or AMD HSA.ronvalencia

[QUOTE="tormentos"][QUOTE="ronvalencia"] Modifying ini file doesn't mean it will do the said function. ronvalencia

This is different to PhysX running on AMD GPUs. Call me when NVIDIA ports PhysX to OpenCL or AMD IL or AMD HSA.

[QUOTE="ronvalencia"]This is different to PhysX running on AMD GPUs. Call me when NVIDIA ports PhysX to OpenCL or AMD IL or AMD HSA.tormentos

Wtf? i have posted HSA support for current discrete GCN GPUs i.e. "Extend to Discrete GPU"

You only proven Physx running on the CPU.

Tell me something I dont know

Nvidia's butthurt is more visible from space than the Chinese Wall

PhysX ran on PS3 but didn't have the full package... I'm pretty sure it's the same for the rest of the consoles if they even had any of said features.

 

Still doesn't explain why he mentionned it was CPU dependent when AMD card was used.... which is not mention when using Nvidia card.

Also, it's still very vague to see if all was rendered exactly the same... and this is one game only deal ?

So more tested is needed and better documenting aswell.

Bebi_vegeta

Yeah,that´s exactly what they said :roll: And Nvidia is a much bigger and way more profitabe company than AMD,why would there be any butthurt is beyond me,unlike AMD,Nvidia is ablçe to be picky with contracts,that´s why they didn´t do any console builds,they don´t need to and they ask for way more than AMD,for AMD these console deals have been their saving grace and even with that Nvidia still is by far the most profitable company.MrYaotubo

You think Nvidia does not care they didn't get these contracts? lol

AMD needed these contracts from the consoles to get out of the slum that their in financially. AMD was able to provide an all in one package for them to use instead of having to spend more in R&D combining multiple items from multiple companies. AMD isnt providing hardware that's any faster or better then what Nvidia is able to come up with on the gpu front. Nvidia just points out that these consoles are no where near the level of pc's using upper tier gpu's and AMD are just trying to keep the hype up with these consoles to make them more appealing since AMD needs this business.04dcarraher

Don't care. I'll still use nVidia. I used to use AMD back in the day, then I got a job and had more money. Now I use Intel and nVidia. Better overclocking, much better drivers, SLI is better/more consistant than Crossfire, and I don't need power per dollar... just power.

[QUOTE="Bebi_vegeta"]PhysX ran on PS3 but didn't have the full package... I'm pretty sure it's the same for the rest of the consoles if they even had any of said features.

 

Still doesn't explain why he mentionned it was CPU dependent when AMD card was used.... which is not mention when using Nvidia card.

Also, it's still very vague to see if all was rendered exactly the same... and this is one game only deal ?

So more tested is needed and better documenting aswell.

tormentos

[QUOTE="Bebi_vegeta"]PhysX ran on PS3 but didn't have the full package... I'm pretty sure it's the same for the rest of the consoles if they even had any of said features.

 

Still doesn't explain why he mentionned it was CPU dependent when AMD card was used.... which is not mention when using Nvidia card.

Also, it's still very vague to see if all was rendered exactly the same... and this is one game only deal ?

So more tested is needed and better documenting aswell.

tormentos

Ps3 is also gimped, some PhysX feature are not even in some games...

[QUOTE="tormentos"][QUOTE="Bebi_vegeta"]

Then why did your own link say that ?

Furthermore all PhysX effects are offloaded to the CPU when using an AMD graphics card so depending on your processor the performance will vary quite a lot. As we were using the Core i7-3960X the hit wasnt nearly as significant as you will experience with a lesser processor.

ronvalencia

Modifying the ini file doesn't mean it will do the said function.

[QUOTE="ronvalencia"]This is different to PhysX running on AMD GPUs. Call me when NVIDIA ports PhysX to OpenCL or AMD IL or AMD HSA.tormentos

Yet in this benchmark the GTX 680 averages 69 fps while the 7970 averages 33 fps. http://www.pcper.com/reviews/Graphics-Cards/Borderlands-2-PhysX-Performance-and-PhysX-Comparison-GTX-680-and-HD-7970/GPU-

This site recommends disabling physx on amd gpu's. http://www.hardocp.com/article/2012/10/01/borderlands_2_gameplay_performance_iq_review/3

[QUOTE="tormentos"][QUOTE="ronvalencia"]This is different to PhysX running on AMD GPUs. Call me when NVIDIA ports PhysX to OpenCL or AMD IL or AMD HSA.Cranler

Yet in this benchmark the GTX 680 averages 69 fps while the 7970 averages 33 fps. http://www.pcper.com/reviews/Graphics-Cards/Borderlands-2-PhysX-Performance-and-PhysX-Comparison-GTX-680-and-HD-7970/GPU-

This site recommends disabling physx on amd gpu's. http://www.hardocp.com/article/2012/10/01/borderlands_2_gameplay_performance_iq_review/3

[QUOTE="tormentos"][QUOTE="ronvalencia"]This is different to PhysX running on AMD GPUs. Call me when NVIDIA ports PhysX to OpenCL or AMD IL or AMD HSA.Cranler

Yet in this benchmark the GTX 680 averages 69 fps while the 7970 averages 33 fps. http://www.pcper.com/reviews/Graphics-Cards/Borderlands-2-PhysX-Performance-and-PhysX-Comparison-GTX-680-and-HD-7970/GPU-

This site recommends disabling physx on amd gpu's. http://www.hardocp.com/article/2012/10/01/borderlands_2_gameplay_performance_iq_review/3