The two cards are identical in length. They are both 9.5 inches in length.
There are hacked drivers that let you run PhysX on a Nvidia GPU while using a primary ATI GPU and drivers. If you do pick up an HD 5850, I suggest looking at ones with non-stock cooling like this Gigabyte one.
As for the RAM I would suggest, like the others, to upgrade to 4GB.
As for the rest of your PC, your pretty much good. You already have a quad core. If you wanted to get a bigger HDD you could, 1TB and 2TB HDDs can achieve far better speeds than your 320GB HDD and even your 146GB VRaptor.
there the same size actually.. in fact (varying on model) the hd 5850 is actualy SHORTER in size :Palso it would consume over half your psu under idle.. better make sure you have no power hogs under your hood :PionusX
http://www.guru3d.com/article/radeon-hd-5850-review-crossfire/9
Our test system is a power hungry Core i7 965 / X58 based and overclocked to 3.75 GHz. Next to that we have energy savingfunctions disabled for this motherboard and processor (to ensure consistent benchmark results).
Our ASUS motherboard also allows adding power phases for stability, which we enabled as well. I'd say on average we are using roughly 50 to 100 Watts more than a standard PC due to these settings and then add the CPU overclock, water-cooling, additional cold cathode lights etc.
Keep that in mind. Our normal system power consumption is much higher than your average system.
System in IDLE = 168 Watts
System with GPU in FULL Stress = 348 Watts
The monitoring device is reporting a maximum system wattage peak at roughly 350Watts, andfor a PC with this high-end card,this is simply low and certainly remains within acceptable levels.
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