GTX460 Issue - Second GPU does not clock up?

[Ensign.Fodder]

So I have been out of commission for about two weeks (dead PSU & family medical crisis) and just recently got my system up and running again so I am not sure what the "cause" or "when" the problem happened but:

Using MSI Afterburner to OC I see the first GPU scale up clock when folding on that card
I do not see the same on second but GPU usage is 99%
1st is 875/1750/1800 (core/shader/memory) and settings should be synchronized
2nd is 405/810/1800 (confirmed with GPU-Z)

Currently both are connected to a monitor (DVI & HDMI to same)
Physical SLI bridge is installed
SLI is disabled in nVidia control panel

New PSU is a Thermaltake ToughPower XT 750 replacing Coolermaster GX Series 750.

If I run FurMark 1.9.1 (after enabling SLI) I see both cards at OC max and UPS starts screaming since draw is higher then maximum.

If I run F@H with SLI on I see both cards hit maximums but I always thought I needed to have SLI disabled?

Any ideas?

 

[R-Type]

When I had a gtx 460, it would default down to 405 clock if the overclock was unstable while folding. Restarting the PC would correct this, but you like need some more volts or lower speed to be stable at 875. Please let me know if this works.

 

[jebo_4jc]

I've seen some funky behavior with SLI disabled/enabled before. Leaving SLI enabled shouldn't pose a problem these days. If enabling SLI fixes the issue you're good to go.

 

[Jester14]

875 is a pretty intense OC so it may be downclocking to save itself. SLI shouldn't be a problem unless you're running multiple monitors. Then things get screwy. You can also try setting the nVidia control panel to "Prefer Space Heater" mode. That should keep it from downclocking when idle, assuming it's not an excessive overclock causing the issue.