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GPU Idle (or not?)

How can I tell if my GTX 570's GPU is idle?

My PC has really become a beast in the past week (new hardware). I would really like to use my PC for more tasks and the tasks in mind involve a couple tuner cards and video encoding for media center purposes. I don't want to use CUDA or anything for the encoding so I would really like for the card to be idle and the PC to be on all the time.

I just don't want to waste a godzilla amount of power because I don't feel it is justified (just for over the air television).

Of course I'm also a heavy gamer so removing the card isn't really an option.
 
I just wanted to bump this since there were almost 50 views and nobody has answered about some kind of monitor to tell me if my gpu is idle.
 
Download MSI Afterburner. There's a monitoring window in it where you can see current temps, usage and clocks for pretty much everything. You might need a beta from Guru3D - no idea if version 2.0.0 supports GTX570.
 
GPU-z will show what instantaneous clock speeds and voltage are. Can also give running output to a file so you can datalog what your GPU clocks / voltage are doing.

When it's idle, clocks and voltage will be reduced signficantly.
 
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