I'm looking to buy a GTX 580 for PC gaming. I aim to be playing on a 1920 x 1080 display. What parameters should I be looking for (eg speed of GPU, Shader, DDR5, DDR5 RAM size), chipsets, format support. Under what situations would I need a card with 3 GB RAM? It's important that the card I get is silent, I notice at Scan.co.uk, this one by MSI is indicated as a "Hot Seller" Scan.co.uk: MSI 1536MB GeForce GTX 580 Twin Frozr II/OC NVIDIA Graphics Card - N580GTX Twin Frozr II/OC, however, according to its specs, its it's missing the OpenCL Support and OpenGL 4.1 that's listed for other cards. This one by Palit (I can't say I heard of them) has 3 GB RAM for only 20 more than the MSI Scan.co.uk: Palit 3GB GeForce GTX 580 NVIDIA Graphics Card - NE5X580010FB but I don't know what the hidden downside is, since other 3 GB cards ae way more expensive. There's the Gigabyte Super Overclock with 855 MHz GPU for £423.10, but I don't know if the extra MHz make much difference and worth the extra money. What are the good manufacturers to go for, or does it not matter? Is there any advantage of getting an ATI/AMD-based card over nVidia these days? The reason why I'm going for nVidia is because of the extra support for features such as PhysX and 3D Vision. Any ideas? Thanks.