Really need help on ddr2 vs ddr3

im really stuck here.. im not much of a computer known guy. all i know is how to put them together load the software etc. im trying to fine a very perfect video card for a mortherboard. the mortherboard runs on DDR2 but the video cards i have looked at and they are like so powerfull runs on high res. but they are all DDR3 will a DDR3 video card run on my computer. or do i really need to get my self a DDR2 here is the mortherboard im geting.

http://www.tigerdirect.com/applica [...] =M452-6000 i hope i can run ddr3 if i can then sweet no need to worry about ddr2. all the ddr2 sucks to be honest..

Are you sure the graphics card uses DDR3 and not GDDR3? In any case, it won't be a problem. The graphics card's memory is on board.

yes im sorry it's gddr2. what is the best cpu for a gammer. i have always told amd is the best cpu for a gammer. but im stuck i have heard so many things i just dont know what to belive... all i know is i want the computer to be fast. and can be able to play every single game on the market. and for the resolution at lest 1920 x 1200 or more. so you saying is that i can run a gddr5 and it still work on my computer even thoought i have a ddr2 mortherboard?

if so that means i can run the 2GB ATI RADEON HD 4870 X2
GPU/VPU: ATI RADEON HD 4870 X2
RAMDAC: Dual 400 MHz
Maximum Resolution: 2560 x 1600 (Digital) - Dual Link DVI
Video Memory: 1GB x2
Memory Type: GDDR5
Memory Interface: 256-bit x2
Stream Processors: 800 x2
Core Clock: 750 MHz
Memory Clock: 3.6Gbps
Interface Type: PCI Express 2.0
Interface Speed: x16
Connector(s): HDTV

No Its not like that look what i have
GA EP45-DS4P DDR2
VGA XFX 9800 GTX DDR3
and it is working perfect so dont worry.

It depends on the budget, which games, what motherboard you have, etc. There is no one best.

Oh, and if you don't have the motherboard yet, why get that one? Get an Intel board instead, such as a good one with a P45 chipset.