I dont have a killawatt so Im hoping someone may know. When you turn off CF in CCC...

[funboy6942]

Does it also cut off the voltage to the other card or is it still sucking up the juice? If it does then there really is no point to turning it on or off if it is going to keep eating away at my electricity bill.

Anyone know?

 

[dave_the_nerd]

Depends on the card. The radeon 7k series will actually shut the card off, or at least almost completely off (less than 2w or so.)

Most of the rest will be idle, in the 5-20w range, depending on the card.

 

[ViRGE]

For a 7K card it will still go into ZeroCore mode when CF is enabled so long as the task at hand doesn't require CF to be initialized. 6K/5K cards don't have ZeroCore, but the same principle still applies; they idle at the same lowest power state regardless of whether CF is on or off.

 

[Termie]

FYI, on 5000 series crossfire, my idle power use went up when crossfire was disabled. Major fail! I think it's because crossfire actually shut down some of the 2D circuitry in the slave card.

My idle went up about 5w with crossfire disabled.

 

[Arkadrel]

This is actually one of the cool things about the 7xxx series.
eg. a Crossfired card, when not in use ZeroCore will turn it off.
(down to ~1watts of power).

Other cards (amd(older models)/nvidia) will idle in 15-20watts range or so.

 

[funboy6942]

Well thats all cool. I was hoping that if I left the card in there it wouldnt be sucking down 200watts~ when CF is off. I can live with 15-20, thats fine. Thanks guys!

 

[SickBeast]

Just bitmine and then you don't need to worry about it.