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How much voltage can i use on the memory on a 7970 GHZ

post #1 of 8
Thread Starter 
How much voltage can i use on the memory on a 7970 GHZ ?

Im currently topped out on my core at around 1200mhz i think i can get 1215 if im pushing itat 1.24 Volts

with my memory im currently on 1.6 volts i was at 1675 and that was fine i in heaven and River vut started to artifact in BF3 and Crysis 3

Ive jumped back down to 1600 and still saw some artifacts in Crysis 3 put it back to 1200/ 1500 it was fine. My temps are good I was getting around 75 on the core and 80 ish on the vram.

I was thinking of pushing the voltage up past 1600 it see if that improves things and just want to know what a safe working limit ?

Cheers
post #2 of 8
I would say that maybe .50-1v should be the max, and this will only increase the maximum memory clock very slightly. I can get 1700 mem on stock voltages, but with 1.7 on the memory I still am only able to push 1775. The memory on these cards is a hit or miss. Usually, you can get pretty close to the maximum overclock on the memory with stock voltages. I would say your probably at the limit, or pretty close to it.
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post #3 of 8
I ran 1700mv and 1650mhz on my memory with my hawks with no problems. Just monitor temps
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post #4 of 8
Thread Starter 
theses cards come at stock on 1500 at 1.5 volts so i was hoping to be able to get at least 1600 stable
post #5 of 8
Ya i upped my memory from 1.6v to 1.65 - and its pretty hit or miss...i believe its 1650mhz stock, and im running at 1750mhz.

It helps FPS a bit...I actually tested this last night, stock 7970 is 1375mhz (since the lowest my slider would go is 1450mhz i used that) vs 1750mhz - it turned out it was around 1-3fps gain under Ultra Settings 1920x1080p for Bioshock Infinite.

Core overclocking helped much more.
post #6 of 8
That game doesnt require very much resources though. You should test on a more demanding title.
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Hard DriveOptical DriveCoolingCooling
120GB revo drive None Sycthe Big Shuriken 2 Modded Titan TTC-HDC4 HDD 
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post #7 of 8
From my own experience with 7970's I can say mem oc helps till about 1600Mhz if core is 1200Mhz. At 1300Mhz core performance stopped increasing noticably at 1700Mhz.

Measured with Heaven, 3D Mark 11, Resident Evil 5 benchmark mode and a standing still scene in BF3's campaign measuring FPS and frametimes with MSI AB.

One of my 7970's, a boost version which yours is as well having 1.500v stock ram voltage, also had a really low max speed. Something like 1685Mhz on 1.63v.. Didn't wanna push harder on those 1.5v chips..

My other, much older, 7970 with 1.600v ram did 1725Mhz on stock and with 1.72v pushed all the way up to 1880Mhz. Only that had a crappy core OC of just 1230Mhz max @ 1.3v...
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post #8 of 8
Thread Starter 
i take it you was were on water at those speeds ?
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