AMD today released the ATI Radeon HD 5970, “the fastest graphics card ever created”. According to AMD, the Radeon HD 5970 brings a pair of “Cypress” GPUs linked on a single board by a PCI Express bridge for nearly 5 TeraFLOPS of computer power, or a mind boggling 10 TeraFLOPS when setup in CrossFireX.
Asustek's ATI Radeon HD 4850 video card with 512MB or DDR3 VRAM, is a higher-end video card for desktop PCs. The graphics card has 800 stream processing units, a 256-bit memory interface, and support for Microsoft DirectX 10.1 and ATI CrossFireX technologies.
The XFX GeForce 8500GT 256MB is a mainstream sub-$100 graphics solution, providing users with a DirectX 10 support, a hardware decoded high-definition video playback with HDCP, and a silent operation.
"Sorry to disabuse you of your ideas, but changing your graphics card will not affect the speed of Photoshop one Iota. Photoshop does not use a 3D API, nor does it transfer any processing to the graphics card. Photoshop is CPU and RAM limited ONLY. You have a HEAP of RAM (far more than you really need I suspect - and unused RAM might as well be in the top drawer of your desk for all the good it does you.) so the only thing to hasten PS performance is a new/faster CPU. More disabusing I'm afraid: Memory on a graphics card is only used for storing textures. True, the front and back buffers are there too, as well as a limited amount which is used for anti-aliasing and other 3D effects, but the vast majority is there to store textures in OpenGL or DirectX. So - the amount of memory on your GFx card HAS ABSOLUTELY NOTHING TO DO WITH PC PERFORMANCE OUTSIDE OF 3D APPLICATIONS. Hope this saves you wasting your money. If you aren't a 3D gamer, then you most definitely DO NOT NEED A NEW GFX CARD."