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June 05, 2013, 03:39:35 AM |
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If you jack up the clock speed of the gpu, you have to usually give it more voltage to keep it from freezing up. More voltage = more power = more heat.
If you jack up the memory speed, you have to usually give it more voltage as well, to keep the memory firing. More voltage = more power = more heat.
If you UNDERCLOCK the memory, but jack up the GPU speed, you can usually get away with undervolting, so it will use less power.
How much that is, you have to play with it.
As an example, I have my 7950 overclocked to 1075 mHz (from 925), underclocked memory to 950 (from 1200 I think), and undervolted at 1150 mV (from 1250 mV).
This allows the card to run at 67 C, instead of 74 C, than if I had it at 1000 mHz, full memory clock, and full voltage of 1250 mV.
Basically, turn down the memory and voltage, jack up the GPU, and you can manage your temps better also. I get about 520 mHashes with my settings, versus 460 at stock....so, that's a gain.
It is worth it to note that on this card, Powercolor 7950, the memory does not have heat sinks on it, and the cooler generally sux...but anyway.
I'm sure other people will have other things to add, but those are my findings (so far).
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