Hey Duders,
 
I've got quite a luxery problem that I can't find answered on the regular PC-forums. Here's the deal:
I have two 8800gt video cards. Since I've recently become a cheap bastard, I'm trying to save money on my energy bill. Now, I have taken my 2nd 8800gt out of there and now run just a single 8800gt. Now I'm struck by the dilemma when playing GPU taxing games of putting my 2nd 8800gt in there again for SLI. 
 
Now here's my question to you: 
Is there a way to keep my 2nd 8800gt in there, but not making it use power? I want to be able to keep the thing in my motherboard and keeping it hooked to the power-sopply, but only to be accessed when I put my SLI-cable between the two cards.

Try MSI Afterburner or EVGA Precision,  just make a setting when gpu usage = 0% to throttle down the gpu clock to about 50mhz, and another when it goes above 5% to go back to full power.  So when it's idle it isn't eating up your energy.

" Try MSI Afterburner or EVGA Precision,  just make a setting when gpu usage = 0% to throttle down the gpu clock to about 50mhz, and another when it goes above 5% to go back to full power.  So when it's idle it isn't eating up your energy. "

Cards don't run at full tilt all the time.  In Multi-GPU configurations the secondary adapter is put to sleep in 2D applications, additionally the primary adapter scales down to a low clock speed and low power usage scenario in 2D mode and dynamically spools up based on the detected need.  Theres no harm in leaving both cards in your case as they will use sod all power when idle, heck my dual 5870's only suck something like 38watts when idle.