Silly post. You don't what you are quoting.
PS4's faster GPU read (one direction) is due to GDDR5's 176 GB/s peak. Even if you applied 5870's 71 precent efficiency, it still has ~124 GB/s.
X1's read (one direction) would mostly come from it's DDR3 which is limited to 68 GB/s peak. PS4 wins the GPU read memory bandwidth component while X1 wins the GPU write memory bandwidth component i.e. write to 32 MB ESRAM.
PS4's numbers for either 176GB/s peak or 124 GB/s would be reduce for concurrent read AND write e.g. 88 GB/s or 62 GB/s respectively.
Alpha blending requires both read and write, hence 133 GB/s (agreagate for read and write) from 192 GB/s peak ESRAM based prototype machine.
http://www.edge-online.com/news/power-struggle-the-real-differences-between-ps4-and-xbox-one-performance
Xbox One does, however, boast superior performance to PS4 in other ways. Lets say you are using procedural generation or raytracing via parametric surfaces that is, using a lot of memory writes and not much texturing or ALU Xbox One will be likely be faster, said one developer
http://www.edge-online.com/news/gaijin-games-on-why-war-thunder-isnt-coming-to-xbox-one/
How much more powerful?
AY: It depends what youre doing. GPU, like 40 per cent more powerful. DDR5 is basically 50 per cent more powerful than DDR3, but the memory write [performance] is bigger on Xbox One so it depends on what youre doing.
How is that going to translate to on-screen results for the kinds of games you want to make? So to optimise War Thunder on both consoles you could hypothetically make a better, prettier version on PS4?
AY: Yep.
KY: Probably yes. But again, thats not a very big deal.
Gaijin's statement on memory writes backed by another source.
Interestingly, "50 percent more power" on GDDR5 vs DDR3 area would yield 102 GB/s i.e. 1.5 x 68 GB/s = 102 GB/s. My 5870's ~71 percent efficiency factor for PS4 was optimistic (it wouldn't be optimistic when PS4 CPU's <20GB/s is factored in).
----------------------
For statement
Our contacts have told us that memory reads on PS4 are 40-50 per cent quicker than Xbox One, and its ALU (Arithmetic Logic Unit) is around 50 per cent faster. One basic example we were given suggested that without optimisation for either console, a platform-agnostic development build can run at around 30FPS in 1920×1080 on PS4, but itll run at 20-something FPS in 1600×900 on Xbox One. Xbox One is weaker and its a pain to use its ESRAM, concluded one developer
Unlike my posted dev statements, claims from http://www.edge-online.com/news/power-struggle-the-real-differences-between-ps4-and-xbox-one-performance/ doesn't have thier name on it.
The ability to effectively use ESRAM is mostly due to dev's skills i.e. it would be hard for devs who are not use to X1 or Xbox 360's dual memory speeds/different memory size setup.
PS; PS4's Radeon HD drivers must have $uck to have 50 percent faster memory over DDR3 (with 68GB/s peak) i.e. it's slightly slower than my posted Radeon HD 5870's OpenCL (on Windows) memory benchmarks.
For GDDR5's "50 percent" faster (read) memory over DDR3 (with 68GB/s peak), it's 1.5 x 68GB/s peak = 102 GB/s.
AMD Radeon HD 5870 has theoretical 153 GB/s memory bandwidth.
AMD Radeon HD 5870 has theoretical 153 GB/s with a 108 GB/s practical i.e. 70.5 percent efficient.
It looks like Sony's PS4 is running AMD's Radeon HD *like* drivers on FreeBSD.
ronvalencia
Hypocrite Hypocrite Hypocrite.
So Edge is good when it say the xbox is close when it say it not Edge = bad.
133GB/s alpha blending came from a nameless developer in other word you are a huge Hypocrite,so when some one say something about the xbox one even if it is a nameless developer is true,but when the same is done to the PS4 is a lie.
Since day 1 you started quoting 133GB/s alpha blending which came up from a nameless developer on an leak on DF,that one is true in your eyes,but now that a nameless develover leak that the PS4 is performing way better is a lie and a nameless developer has no credibility.
My god what a sad lemming you are.
But wait there is more,using Ronvalencia argument of thise doesn't fit the description of that.
The 5870 doesn't is not an APU.
The 5870 is not GCN.
The 5870 doesn't have the same memory controler of the PS4.
The 5870 as lower bandwidth thant the PS4.
The 5870 is 1600SP yet losses to the 7850 with 1024 with the same bandwidth.(go away with your excuse of different GPU,since you don't take it into mind when you compare this GPU with the PS4 one)
The 5870 doesn't have a unified memory pool.
The 5870 is not HSA or has hUMA.
Should i go on.?
Is funny that you want to use a 5870 memory problem and compare it to the PS4,when the 5870 is not even remotely close to the PS4 or operate in remotely the same way,for some one like you who claim the xbox one doesn't have a Bonaire GPU because the 7790 doesn't have 256 bit bus,you should love to compare the PS4 to GPU that are not even close.
By the way on neogaf i read 2 days ago a quote from an open developer,claiming 172Gb/s on the PS4 that is basically like 97% effective unlike your crappy claims of 70% based on a crap GPU from years ago,that has nothing in comon with the PS4 but GDDR5.
Log in to comment