I'm Upgrading my processor to Pentium Dual Core E6500 for playing
gta 4, cod 4, crysis, far cry 2, STALKER: Call of Pripyat, Halo 2 etc...
on a DG31PR mobo with 2x1GB 800MHz 5-5-5-9 at 1280x800 resolution max. Which GFX card will be preferred?
And by the way, if you're going for the HD 4850 I would advise you to go either for the Sapphire Toxic HD4850 with 512MB GDDR3 or the Sapphire Vapor-X HD4850 with 1GB GRRD3.
Firstly, 1GB will make a big difference in performance when Anti Aliasing is used and secondly the 'Toxic' graphic cards from Sapphire are factory overclocked, if only slightly, and benefit from a Zalman cooling solution which means you can safely push them even further with overclocking.
On the other hand, the Vapor-X is claimed to be a lot more quiet than a standard solution but I wouldn't know for sure as I haven't experienced it.
I have to disagree with the suggestion of getting the 1gb version, unless you are planning on upgrading your monitor in the lifetime of your card. At that low of a resolution, you will have no use for the extra cost of 1gb of memory over 512mb versions.