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[Official] AMD Radeon HD 7950/7970/7990 Owners Thread - Page 761

post #7601 of 38704
Well, I just bought a 7970 lightning. It's been a long time since I've owned an ATI card. Hope the exaggerations about drivers are.. exaggerations.
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post #7602 of 38704
Was overclocking my 7970 last night (Sapphire Ref.), It was only a modest OC - 1200Mhz/1650Mhz @ 1.225v, ran Heaven with highest settings possible and the ATi drivers kept crashing a couple of scenes in. So I upped the volts to 1.25v. It didn't crash after that, but I was getting some really strange artifacts on a couple of the scenes (only a couple out of the 26 possible), strange being a rather odd grey color, as well as there being lots of them.

Is this normal for such a modest OC? The temps were fine, not going above 73 deg/c. Not sure if I should up the volts a bit more, but 1.25v should be enough for such a small OC...

Any ideas?
post #7603 of 38704
Quote:
Originally Posted by m3t4lh34d View Post

With the 7970 the memory clock affects scores quite a bit. Each time I went up 50mhz I gained another 50+ points with 3dmark.

It's probably because of the larger memory bandwidth the 7970 has. Pushing the memory clock a bit more on a 384-bit bus vs a 256-bit bus will most definitely yield better results. I haven't pushed mine anywhere very much yet, but then again, the Windforce 3 cooler on my GA card is insane, my temps reach a max of 48C on load at stock, and stock is already 1GHz core.

EDIT: I know my load temp does not make much sense, but that's what GPU-Z log shows. Or it could be the 2 fans blowing right down on my card from the side panel.

EDIT: My bad, I was reading the wrong time stamp. Temp's were at 60C on load. Which is still amazing. Though I agree, I wasn't loading the card much playing MW3.
Edited by afadzil21 - 3/27/12 at 5:21pm
post #7604 of 38704
Quote:
Originally Posted by theyedi View Post

Well, I just bought a 7970 lightning. It's been a long time since I've owned an ATI card. Hope the exaggerations about drivers are.. exaggerations.

The only problems anyone has with AMD drivers are when they are gaming with 2+ cards. With single card setups, the 7970s are perfect... wink.gif
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post #7605 of 38704
Quote:
Originally Posted by Jmickey View Post

Was overclocking my 7970 last night (Sapphire Ref.), It was only a modest OC - 1200Mhz/1650Mhz @ 1.225v, ran Heaven with highest settings possible and the ATi drivers kept crashing a couple of scenes in. So I upped the volts to 1.25v. It didn't crash after that, but I was getting some really strange artifacts on a couple of the scenes (only a couple out of the 26 possible), strange being a rather odd grey color, as well as there being lots of them.

Is this normal for such a modest OC? The temps were fine, not going above 73 deg/c. Not sure if I should up the volts a bit more, but 1.25v should be enough for such a small OC...

Any ideas?

Temperatures. wink.gif Mine starts doing that when I pass over about 63-68*C, depending on the overclock.
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post #7606 of 38704
I basically have to go up to 1.25+ to run at 1200 mhz on the core. I thought (and still do) it was because my ASIC quality is a measly 53%. I also get artifacts usually when I do it (I think because of the heat I generate). So, to answer your question, depending on your card, it could very well be that you're having that issue. Not all cards are created equal, and 1200 mhz can be getting to the wall, so to speak, with these cards (especially on air).

For reference, my current setup gets temps up to about 72-73 degrees, but not any hotter, even after hours of full load. I don't really see issues personally until I get to about 80C on the core.
Edited by pfunkmort - 3/27/12 at 5:19pm
 
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post #7607 of 38704
Thread Starter 
Quote:
Originally Posted by Jmickey View Post

Was overclocking my 7970 last night (Sapphire Ref.), It was only a modest OC - 1200Mhz/1650Mhz @ 1.225v, ran Heaven with highest settings possible and the ATi drivers kept crashing a couple of scenes in. So I upped the volts to 1.25v. It didn't crash after that, but I was getting some really strange artifacts on a couple of the scenes (only a couple out of the 26 possible), strange being a rather odd grey color, as well as there being lots of them.
Is this normal for such a modest OC? The temps were fine, not going above 73 deg/c. Not sure if I should up the volts a bit more, but 1.25v should be enough for such a small OC...
Any ideas?
Me personally I wouldn't push my card anything past 1070/1400 MHz....
Have you tried lower memory clocks?
Since upping the voltage this far has helped you out, try bumping it another .025v.
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post #7608 of 38704
Quote:
Originally Posted by Evil Penguin View Post

Me personally I wouldn't push my card anything past 1070/1400 MHz....
Have you tried lower memory clocks?
Since upping the voltage this far has helped you out, try bumping it another .025v.

I haven't tried lower mem clocks yet. On stock volts I easy sit on 1125mhz/1575mhz, 68 deg/c and it works perfectly, even without adding +20% power. ASIC quality is 70.6%.

One things however, I am only upping the core voltage, should I be upping the Mem voltage as well?

One thing I noticed which was rather odd. When I put settings back to stock, applied them and ran Heaven Benchmark again...I was still getting the artifacts. MS AB said temps didn't go about 65ish degrees. I restarted the computer, applied the highest CCC OC and it was completely fine again....Cautious to try again with anything higher until I figure out why it was doing it...
post #7609 of 38704
Thread Starter 
The thing with high overclocks is that the higher you go, the more voltage you need as a result of higher temps as well.
Someone that keeps their core at 55c under load might need less voltage than the person that has it at 80c.

It's very possible you need another core voltage boost, Jmickey.
I would keep memory clocks at stock until you can stabilize the core.
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post #7610 of 38704
Quote:
Originally Posted by Evil Penguin View Post

The thing with high overclocks is that the higher you go, the more voltage you need as a result of higher temps as well.
Someone that keeps their core at 55c under load might need less voltage than the person that has it at 80c.
It's very possible you need another core voltage boost, Jmickey.
I would keep memory clocks at stock until you can stabilize the core.

No worries. Will give it a shot when I get home from work! Thanks for the help =D.
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