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Benefits of 7970pcb on 7950?

post #1 of 9
Thread Starter 
I, like many others, had ordered a 7950 due to the huge price drop. Mine has a 7970 pcb (8+6 pin) and was wondering what exactly are the benefits of having a 7970 pcb on the 7950?
post #2 of 9
HD 7970 PCB has extra power phases and also ability to supply upto 300w board power. better power delivery means better stability at extreme OC. which brand did you get, HIS or MSI or Sapphire
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post #3 of 9
Thread Starter 
I went with MSI as I prefer that brand mostly.
post #4 of 9
Great choice, MSI TFIII 7950 w/7970 PCB is probably the best 7950 out there, atleast as far as overclocking goes and hitting extreme clocks, you just need VERY good cooling as many of them have ultra high ASIC, some ppl have hit 1350-1400MHz on water and 1200-1300MHz on air seems to be piece of cake.
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post #5 of 9
Thread Starter 
My 7950 is actually 59.9% ASIC and I never really figured out if ASIC matters or not. I know that GPU-Z gives an "explanation" of what it does, but just how much does it really matter? I've just begun fiddling with my 7950. The default voltages on my card were 1188mv core and 1550 memory. I can take the core up to 1100 and memory up to 1500 with those voltages while the card sits around 48-53c under load on air with vrms being in that range as well. It does take me around 1263mv to hit 1150/1500 though, which takes temps up to about the lower 60s range with vrms roughly around the 64-68c area.
post #6 of 9
Higher ASIC=lower stock voltage and higher temps at lower voltages. Also can hit same clock speeds at lower voltage, example below:

My card has 88,9% ASIC, stock core voltage 1,031V, I hit 1025MHz at that, I hit 1100MHz @1,07V and 1150MHz @1,106V, but my temps get too high after that on air cooling for 24/7 use, @1,1V I saw max of 71C core when playing Far Cry 3 during summer on very high ambients, usually sits around 60-65C.

If I were to feed 1263mv through my ultra high ASIC card, it would probably 1) throttle a lot 2) melt or fry smile.gif You can do that because your ASIC is lower, so even though your ASIC is lower, you can hit similar clocks at same temps, just need more volts smile.gif
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Samsung spinpoint F3 1TB WD Caviar blue 1TB LG Coolink Corator DS 
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post #7 of 9
Thread Starter 
I see, thanks for the explanation.
post #8 of 9
Thread Starter 
I've been wondering, how bad would it be if I kept my card around 1.3v for gaming since the temps at 1.263 are as low as they are? I kind of want to try my hand at hitting 1200 on the core. I ramped up the fan speed to 70% and the card hovers around 51-54c core and 47-52c vrms. The fan noise doesn't really bother me with my headset on.
post #9 of 9
I came from two generations of Nvidia gpus having run a GTX 460 and a GTX 560 ti after that. I thought I was going to miss PhysX but I didn't even notice due to the incredible framerate. Running the new Tomb Raider, NFS Most Wanted and Far Cry 3 with all settings maxed is pure joy! AMD has also stepped their game up with the latest Catalyst drivers. At full load the card never exceeds 65c.lce6Zbiggrin.gif
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