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Less VDDC when overclocking 7970

post #1 of 3
Thread Starter 
So I'm using Kombustor to test out clocks.

Without touching volts when I run 1125/1375 gpu-z reports VDDC 1.051 (starts 1.057 then goes to 1.051)

Without touching volts when I run 925/1375 gpu-z reports VDDC 1.057.

This is 21% core overclock.
This give 19% more fps in Kombustor.

Question:

A bit weird that more speed needs less VDDC?
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post #2 of 3
I may not be correct, but in my opinion it's not that it needs less power, the card it drawing more power and the VDDC is not staying stable. This is just like when overclocking a CPU and why LLC is often used to compensate for when the voltage drops.
post #3 of 3
Thread Starter 
Quote:
Originally Posted by nugget toes View Post

I may not be correct, but in my opinion it's not that it needs less power, the card it drawing more power and the VDDC is not staying stable. This is just like when overclocking a CPU and why LLC is often used to compensate for when the voltage drops.

Well it's a mystery to me, I tried now overclock memory aswell: 1125/1431.

But I saw no increase in fps and Kombustor so for now I run 1125/1375 and see if games are stable.

Also gpu-z showed 2900mhz on memory when oc memory maybe bug.
Edited by grandpatzer - 2/3/12 at 7:22pm
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