Video cards undervolting... Post your results!

[Magic Carpet]

GTS 450 @ stock

2D: 0.96v
3D: 1.06v

-TO-

2D: 0.86v
3D: 0.925v

-RESULTS-

~3oW power saving and 15c temp drop. Not bad at all.

Could have lowered more but I settled for this. A few days at number-crunching proved its stability.

 

[lehtv]

Gigabyte GTX 560 Ti SOC

@ factory 1000MHz OC: 1.012V, 81-82C load

@ 960MHz: 0.962V, 75-76C load with a quieter fan profile.

822MHz is the standard speed of 560 Ti.

 

[Magic Carpet]

Interesting. I wonder if recent ATIs are good at this?

 

[notty22]

I'm not sure how you are figuring that savings.
This is the stock behavior of my gtx 460's.
They have 3 voltage states.
With a single monitor. You lose the 50mhz state with dual monitors.
50 mhz
405
725

 

[Magic Carpet]

Nice idle temps. Mine idles much higher

I'm not sure how you are figuring that savings.
This is the stock behavior of my gtx 460's.
They have 3 voltage states.
With a single monitor. You lose the 50mhz state with dual monitors.
50 mhz
405
725

I used a kill-o-watt device for measuring. Not the precisest method but good enough to spot the difference.

If you're curious as to what happened to my middle p-state setting?

That's easy... I merged it. No point to have it, all my mkvs can do fine with the lowest p-state performance for maximum power savings and when I need to use GPU, it goes straight to "Performance" mode. Like I said, during load I shaved off ~30w and 15 temp drop. (In BF3, total system consumption doesn't exceed the 170w mark). And my fan setting set to 0 RPMs until the gpu temp reaches 50C (load activities mostly). Efficient, dead-silent and cost-effective (I got it on the cheap too ).

P.S. The stock fan had to go unfortunately, it wasn't anywhere near as quiet as I wanted it to be. Used rubber pads everywhere I could.

EDIT:
Desktop... movies... the card turned out to be as efficient as my old Geforce 6200. Not bad at all.

 

[Nimbo]

my MSI 560ti is factory overclocked to 880Mhz at 987mV. I can underclock to 950mV stable but afterburner wont let me further lower voltage. I did notice using GPUshark that coincidentally 950mV is the voltage of lower p states. Is it the lower limit?. How can I go lower voltage?

 

[Magic Carpet]

my MSI 560ti is factory overclocked to 880Mhz at 987mV. I can underclock to 950mV stable but afterburner wont let me further lower voltage. I did notice using GPUshark that coincidentally 950mV is the voltage of lower p states. Is it the lower limit?. How can I go lower voltage?

About any Fermi v-card can safely do 0.86 at 2D clocks. However, I have only tested 450, 460 and 480.

Can you use GPU-Z to dump your bios, upload it somewhere and I have a lookie?

 

[Nimbo]

@Magic: After some googling finding how dump the bios here it is
http://www.mediafire.com/?rbyh411f46m7k56
I assume by your request that the "Minimum" voltage I can set in Afterburner is limited in the Bios?
Is that minimum voltage the same used by the card in the lower performance states?
Thanks for your time!