SonDa5
Supreme [H]ardness
- Joined
- Aug 20, 2008
- Messages
- 7,437
Overclocking Gurus - I've a question for you!
I've a Sapphire 7950 and I'm very happy with the card.
I've done some overclocking on this and on stock voltage, with +20 Power Limit, I can go up to 1135 on core and 1590 on memory (stable) with very acceptable temps (less than 70 on GPU core and between 60 and 65 on VRMs) and on the whole seems okay to me.
My 3DMark 11 graphics score are like 10200 on Professional and 3050 on Extreme and still very respectable for stock voltages. Unigine max settings at 1920X1080 is about 51 avg fps.
However, it all seems a bit weird (at least to me) once I increase the voltage. The stock voltage is 1.125V and even taking it upto 1.156V, I cannot get a further 10 MHz increase on the core, i.e. it still is not stable at 1150 core with 30mV increase in voltage (the Mem clock is still at 1590 MHz).
Does this seem odd, I do not want to take the core to 1.2V in order to test this, but it seemed logical to me that with a slight increase in voltage (like 30mV) I could push my core clock a little higher. I do understand that every card is different but just wondering what a generalized consensus is. My ASIC is about 59%.
Also, my understanding is that its not the voltage that kills the components, rather it is the heat that it generates that is the killer.
Despite the ASIC score it looks like you have a good chip. 1.2v should be no problem for over clocking. Just watch your gpu and VRM temps. IF your card gets too hot it will become unstable.
What Sapphire HD7950 do you have? Sapphire makes about 5 or 6 different HD7950s.