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Overclocking a Sapphire HD7950 Vapor-X

post #1 of 8
Thread Starter 
Hi forum!,

I finally got my Sapphire HD7950 Vapor-X today and first off it isn't voltage locked and has 2x 8pin so it should be the good version.

So I did some OC stuff and when I OC to these settings it would crash after a couple of seconds but temperatures stayed at 62c.

Core: 1200
Memory: 1500
Power limit: +20

Then I tried the following, now the card doesn't crash and also gets 62c.

Core: 1100
Memory: 1500
Power limit: +20

What I would like to ask is why can't I get to 1200? Most reviews out there got the card without any issues to 1200@core and 1600@memory.
If someone else also has this card or the boost, can you tell me your settings?

I used MSI afterburner and have 3 profiles.

#1 (Max OC yet)
Core: 1100
Memory: 1500

#2 (OC but not to the max. More aimed at extending the lifetime)
Core: 1050
Memory: 1475

#3 (Stock settings, this isn't on the OC bios)
Core: 850
Memory: 1250

I overclocked on the normal bios, not the 950mhz OC bios.

Hope to hear from you guys soon!
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post #2 of 8
If indeed it isn't voltage locked, then up the voltage to ~1200mv or more and stabilize your 1200mhz. I'm affraid it wont work though (the voltage adjustment).

It's rare to get stable 1200mhz on stock volts and I'd be surprised if any reviewer did, unless that was a card which uses an unusually high stock voltage (like the HIS IceQ X^2 for example).
post #3 of 8
Thread Starter 
http://www.techpowerup.com/reviews/Sapphire/HD_7950_Vapor-X/31.html

Seems like I am wrong. The maximum my card can go are:

Cor: 1135mhz
Memory: 1635mhz

Might explain why my PC crashed when I was running at 1200 & 1500.

Only thing I just noticed is that I can't go higher with memory speed in MSI afterburner. Max it allows me is 1575 ?
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post #4 of 8
Thread Starter 
Well that went smooth..not.

1110mhz & 1575mhz and it totally crashed on me in seconds. Seems like 1100mhz & 1500mhz are the sweet spot. 1050mhz & 1475mhz for the long run. Don't want to bust the card in 2 years because I was running at 1100 & 1500 every single day.

Still if someone has a idea then please tell me smile.gif Also why I can't reach those speeds.
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post #5 of 8
Nothing wrong an 1135 MHz oc.

Ocn seems to think all 7950 go 1200 MHz + but reality says otherwise.
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post #6 of 8
Thread Starter 
Quote:
Originally Posted by mcg75 View Post

Nothing wrong an 1135 MHz oc.

Ocn seems to think all 7950 go 1200 MHz + but reality says otherwise.

Do you have the same card as me? Or should it be because I OC the memory to high? 1135 and 1500mhz? Can try. Don't think it will improve a lot from 1100 and 1500mhz
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post #7 of 8
I have the 8 + 8 pin Sapphire 7950 Vapor X also and I cannot play with voltages in MSI Afterburner, only in Trixx 4.6. On Boost BIOS my clocks are stable at 1140/1350. Any memory clock over 1400 crashes and I can run my core clock higher at 1200+, but only with forced constant voltage.

1140/1350 @ VDDC (1.250v)1250 and 1200/1350 @ VDDC (1.30v)1300. Can't play with MVDDC.

UPDATE: 1150/1400 stable with MSI AB. no forced constant voltages.
Edited by Menin - 3/29/13 at 5:02pm
post #8 of 8
Quote:
Originally Posted by galaxy366 View Post

why can't I get to 1200? Most reviews out there got the card without any issues to 1200@core and 1600@memory.
If someone else also has this card or the boost, can you tell me your settings?
I can tell you why. But it is a boring answer...

Every core is unique, not one core is identical to another, no matter how good the "processing" is at the factory.
The same goes with our CPUs, one i5 2500K can easy do 4.8GHz with decent voltages and another i5 cant even reach 4.5GHz with even greater voltage.

One thing i have noticed reading alot of forums(regarding this 7950 Vapor-X) is that, if you cant reach 1200-1250MHz its a bad card. ohno-smiley02.gif

But think of it, the referencestandard of the 7950 is 800MHz core. If you can reach 1100MHz, that is a whopping 300MHz of OC. How can that be poor?
This aint a Gigahertz edition card. And with the boost you get 950MHz out of the box, reach 1100-1150MHz and you have 150-200MHz of OC.

From boost 950 to maybe 1100 isn't so much, but hey, you have to understand that the core is already overclocked from 800MHz.
Once again, the referencestandard is 800MHz.

Just to tease with you, a little picture of my OC'ed card and a 3DMark11 run with those settings.
3DMark11





Quote:
Originally Posted by glina View Post

If indeed it isn't voltage locked, then up the voltage to ~1200mv or more and stabilize your 1200mhz. I'm affraid it wont work though (the voltage adjustment).

It's rare to get stable 1200mhz on stock volts and I'd be surprised if any reviewer did, unless that was a card which uses an unusually high stock voltage (like the HIS IceQ X^2 for example).
Its not voltage locked anyway, that thing is for sure. If its rare or not to reach 1200MHz i cant tell. Perhaps you are correct. I still think that 1100MHz is pretty good.

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