ATI Crashing Problem?

Ok quick background, I built my first crossfire system a couple of years ago now. using dual x1300's everything run fine on most games. Started playing Eve Online on my older computer. Tried playing on the crossfire system and the game would lockup/crash on boot of eve. Most common BSOD code was due to ati3duag.dll Considering the x1300's are much older now i picked up a pair of hd4670's cheap.
but im still having the same problem. I upgraded xp to SP3 and now im getting a broad range of BSOD's from STOP 0x0000000A's to IRQ erros, and some times jsut hard lockups and auto reboots. Im currently at work so i cant give a full posting of specs but the basics are here. if anyone has any ideas.

OS: Windows XP SP3
MB: Asus A8R-MVP (Latest Bios Update)
CPU: AMD Athlon FX x2 (2Ghz Equiv)
RAM: 2 x 1Gig Kingston DDR2
Video: ATI Radeon HD 4670 (Latest Drivers. Tried both with and with out CCC)
HD: 250Gig Sata Western Digital
PSU: 450 Watt that came with the Case. *Have also Tried a New Ultra 550PSU with no change.

Im not usign the crossfire setup due to it not being a crossfire X Motherboard. so i just have one card installed at this time. if i cant get the problem fixed then im gonna return them

ANY HELP IS GREATLY APPRECIATED

Tim

HAHA no im not blaming ATI but my other system which has a older ati card works fine. And no i havent run a memtest yet that was my next step when i get off work tonight. Last time i ran it everything checked out fine with both sticks together and each by them selves. this is why im totally stumped on this probem. and the only time i have it is trying to play eve online and other higher end graphics games

Ok well im at work until 10 central time ill be sure to give this a try and go from there thanks for the help thus far

Oh well you said you had DDR2 at first.

Have you ever had a nvidia card installled on this computer?

I doubt the instability of your aging system is caused by your video card. Have you tried another video card in this system?