Can't get memory to run at 1066mhz (rated) in vista

Hi all,

I didn't know if to post this in the vista forums or here, so I'll settle with this. anyway I build a new system yesterday and installed vista to latest sp1 (all updates) and installed some games. I Got corsair dominator (2 sticks of 2gs) 4gbs of ram and they are rated at 1066mhz. So I upped my FSB to 400 mhz to put my Quad core speed at 3.4ghz(Q9550 rated at 2.83ghz) Anyway since then I was unable to get vista to run stable in games. I could play a couple of games like steams HL2 series and COD4 but other games would hard lock and the system screen would go black and reboot. After restart Vista would say that ATi drivers where to blame(BSOD Error 1033) However, sometimes vista would recover and say that "atikmdag stopped responding"

System:
Q9550 Core two Quad (OC to 3.4ghz and fsb set to 400mhz)
CORSAIR DOMINATOR 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 1066 (PC2 8500) <---I can only set at 800mhz for system to be stable in games. I can run vista at this speed it is only when in games.
Asus Rampage Formula

3870 Radeons Crossfired (not OC at stock and use rivaTuner v2.11 to put fans at set speed so it should neever overheat )
650watt BFG powersupply

I'm in a rush so if you need more info I'll post it later.

Yea i upped the voltage to it's rated settings when i put it at 1066.
Timing 5-5-5-15
voltage at 2.1

And it still crashes. I seriously think this is a vista problem if I am able to run some games at 1066mhz just fine and other I can't.

Edit: Btw I'm using Vista 64 fyi

yea you can tighten the timings at 800 to get similar performance when compared to increasing speed but loosening timings

I believe your RAM timings are probably fine. What makes you think the RAM is the issue when the error itself says its the video card driver? That baffles me a little. The ATI drivers are problematic in some games and I have a feeling your problems are the same as mine. I can play HL2, and WOW for HOURS and no crashes, I pop in WAR or COD4 and crashes start happening. If the RAM was the problem it would be having the same issue in all the games.

I found out that the problem seems to be the GPU downclocking. I was running RIVA tuner to monitor GPU clock rate and GPU use, and the crashes would happen because the GPU would downclock. The GPU use would then spike and Viola... crash. Not sure of CCC.exe has a way to do this, but I enable low level GPU overclocking for the games that had the problems and made sure the stock GPU clock speed never moved while playing those games and my crashes went away.

David