Operating System MS Windows XP Home 32-bit SP3 CPU AMD Athlon 64 X2 5000+ Brisbane 65nm Technology RAM 2.00 GB Single-Channel DDR2 @ 325MHz (5-5-5-15) Motherboard Acer RS740DVF (AM2) Graphics Sapphire HD 6570 ddr3 2gb Hard Drives 149GB Seagate ST3160815AS (SATA) Optical Drives HL-DT-ST DVDRAM GH40F Audio Realtek High Definition Audio PSU FSP 450w
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the memory type of the gpu is not dependent on the motherboard (unlike your ram for the board)
there are only a few things to consider, first is the slot, if it's AGP then the card should also be AGP, pci-e card for pci-e slot (board). next is psu, it is recommended to use good quality psu. for powerful GPU's you will need good psu's also. that's about it
i had a athlon x2 5200 overclocked and it had trouble playing bf3 with my old 512mb card. it could have been just the card but it may be a bottleneck to a better card. i believe i tried my 550ti vs my new rig and it had bad frame rate drops as well, but it could have been due to the fact i dont have more than 2gb of ram in that system since my other slots are shot causing blue screeing. with 3gb it ran better.
would also reccommend another stick of the same ram since not running dual channel will hurt your performance esp in gaming. most new games you should have atleast 4gb
2gb of RAM is incredibly low for gaming needs. I'd put it up to 4gb, atleast.