What is difference between Sapphire HD 6770 1GB DDR5 and AMD Radeon HD 6770 1GB DDR5 Graphic card?

The 6670 is slightly faster, and yes your computer will work with these cards, as it has a spare pci slot. There is no point getting any faster than them if you have only a dual core 2.2ghz processor. Make your own choice about the ram, If you find you want more performance just get 2 more Gb of DDR2 (don't forget it has to be DDR2).

That card is a low end gaming card and should hold up well to mainstream games and also other games such as BF3 at low/med settings. Your processor may hold you back though, which means you may have to change your motherboard in the near future to replace it at which time your old ram will no longer fit, so I seriously suggest just building a new computer instead of keeping your old one on life support.

You can have the best equipment but make sure you can keep it cool or you will be looking at a toaster with 4 hours of gameplay.

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