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7950 Vapor X Voltage Locked? - Page 54

post #531 of 1056
It is, got it thursday from Amazon.
post #532 of 1056
Quote:
Originally Posted by merkaloid View Post

It is, got it thursday from Amazon.

Cool. Going to try the BIOS out.
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B.K.T.
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post #533 of 1056
Hi, I recently bought a sapphire hd7950 vapor-x with 2 x 8-pin power connections and am attempting to overclock it, I have never overclocked a card before, so please, bear with me.

Having read the last 10 or so pages of this thread I'm feeling a little anxious about the possibilities of any overclocking I attempt causing problems, having read that the recent bios versions are screwed up in that the memory voltages are not set correctly.

I have also read that I should be using a number of "work-arounds" to get a good solid overclock from my card, Such as disabling CCC overdrive and using trixx to alter certain settings plus monitoring the state of my card, along with using msi afterburner to change other settings. I can't help but think that considering overclocking is not meant to be the hardest of modifications I can make to my card, that there is certainly something amiss with the card (or the bios) I currently have in my PC, and I am not being encouraged to take the step for overclocking.

If possible, could anyone point me in the right direction as to where I should be looking for more information on overclocking my card, or if there are any simpler steps I can take that I may have overlooked. Also, if it's in my best interests to wait for a new bios version to be released by AMD then I am prepared to wait as I cannot afford to damage this card.

To assist anyone interested in giving me some pointers, here's the gpu-z overview of my hd7950:




Thanks in advance to anyone who can give me a hand.
Edited by splatmantom - 1/28/13 at 8:09am
The splatmachine
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The splatmachine
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post #534 of 1056
It's not difficult at all, unless you want to squeeze out the last bit of performance.

I'd say - enable Overdrive in CCC and push the core slider all the way to the right (1100MHz) and the Power limit to +20. Run a couple of runs in 3dmark and watch for artifacts. Probably everything will be ok. Most of these cards will do 1100 or more without problems. If you crash, step down 10MHz at a time.

Next step , move the memory slider in CCC up to 1450MHz - it's the minimum your card should do. Test and increase the clock in 50MHz steps until you hit the limits in CCC (1575MHz). You probably wont run into any problems.

VRMs only overheat in OCCT of Furmark. These tests are pretty pointless as they are no good for testing stability. You're more likely to find instability in Heaven, 3D Mark or during gaming (Farcry 3, for example, is very demanding), and the VRMS will stay within safe limits.

If hungry for more, try Trixx. This will let you go higher than CCC.
Even more? Try trixx moded version to enable memory voltage control.
Still not enough? Try Afterburner and fix constant voltage, but I do not recommend going that far for anything else other than benchmark runs.
post #535 of 1056
you can use sapphire trixx or msi afterburner. to overclock beyond 1100 mhz in msi afterburner follow the guide below

http://www.overclock.net/t/641299/guide-to-enabling-unofficial-overclocking-in-msi-afterburner

in sapphire trixx max out board power to +20%. in msi afterburner its called power limit. start off at 1ghz. check for stability with 3DMark 11 and Heaven 3.0. if you are able to run without artifacts, freezes, crashes then bump up clockspeed in 25 or 50 mhz steps. if you face problems you can either go back to last stable clocks or go for voltage increase. In Sapphire trixx VDDC is the field which controls core voltage. normally you can easily hit 1100 mhz core clocks at stock voltage and run stable. repeat till you achieve desired clocks or max stable clocks. there will be a point beyond which any amount of voltage will not allow the card to run stable. that max stable oc can vary from card to card. normally with voltage increase 1150 - 1200 mhz is common. 1250 - 1300 mhz is rare.

once you have a stable OC using benchmarks test in a demanding game like BF3. you might have to reduce clocks a bit from max stable OC to maintain complete stability in all games.
Edited by raghu78 - 1/28/13 at 8:20pm
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post #536 of 1056
oky dokes, will give it a whirl and see what clocks this thing's capable of
The splatmachine
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The splatmachine
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post #537 of 1056
It wont be capable of anything because your mem voltage is locked at 1.5v. You will need the modified Sapphire TriXX 4.4 beta to be able to change the voltage to 1.55+v or it will crash at the slightest memory oc.
post #538 of 1056
Mine does 1700 stable for gaming, 1800-1850 for benchmarks on 1.5V.

With 1.6V i can go up to 1950-2000mhz for benchmarks and probably around 1800-1850 in gaming.
post #539 of 1056
Jesus Christ! LOL, thats some amazing memory you've got.
post #540 of 1056
Quote:
Originally Posted by glina View Post

Mine does 1700 stable for gaming, 1800-1850 for benchmarks on 1.5V.

With 1.6V i can go up to 1950-2000mhz for benchmarks and probably around 1800-1850 in gaming.
Ambient temperature 0 Kelvin?
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