SLI 8800Gt issue

[Sgt Rock]

Have a strange problem here, I use to have 2 7900GTX cards in SLI, replaced those with 2 8800GT's in SLI. Now when I run Crysis or Timeshift with SLI enabled the computer shuts down hard with no warning after 10 to 15 minutes. I turn off SLI and the games run fine.

Now I thought there might be a heat issue so I looped 3dmark2006 demo for 2 hours and also tried the NTUNE stress test for GPU for 2 hours with the SLI enabled and no shut downs.

Then to add more strangeness I can play HellGate London with SLI enabled for hours with no shutdowns.

I thought maybe heat but the monitor logs after shutdown show no unusual temps. Then I thought maybe the PSU but the 7900GTX's drew more power then the 8800's. So I am at a bit of a loss.

Please help, thanks!

 

[phas3d]

OS? mobo? did you have any troubles with NTune using the 7900gtx s? My dual 8800gt cards gave me nothing but troubles at first but I have them under control now. I ended up uninstalling NTune and reinstalling graphics drivers, tweaking mobo settings and even switching displays and now I dont have any troubles.

For instance, my system would hang or crash when playing Crysis on my Westinghouse 47inch LCD, but playing on my 24 inch Gateway 2400 I dont have any problems running Crysis and actually am able to bump up the clocks on my cards some without hangs or hard locks.

 

[Sgt Rock]

Running XP on a MSI P6N SLI-FI never had a issue with the 7900GTX's on NTUNE. The display is a Dell 24" LCD. I just find it odd that playing those games results in a complete system power off with SLI enabled yet without no problems. But with SLI enabled on other games/apps like Hellgate or FutureMark SLI has no issues.


Running the 169.09 Drivers. I'll Remove NTUNE and the 169.09's and run driver clean and put them back on. But I can't imagine that drivers could force a shutdown on the system. But stranger things have happened.

 

[Sr7]

Running XP on a MSI P6N SLI-FI never had a issue with the 7900GTX's on NTUNE. The display is a Dell 24" LCD. I just find it odd that playing those games results in a complete system power off with SLI enabled yet without no problems. But with SLI enabled on other games/apps like Hellgate or FutureMark SLI has no issues.


Running the 169.09 Drivers. I'll Remove NTUNE and the 169.09's and run driver clean and put them back on. But I can't imagine that drivers could force a shutdown on the system. But stranger things have happened.

It's a hardware problem. If it reboots, it's hardware, if it powers off completely, it's probably a bad PSU. Systems don't just shut down. That's an inability to deliver power.