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[Official] AMD Radeon HD 7950/7970/7990 Owners Thread - Page 52

post #511 of 38701
Tahiti doesn't always like more voltage! I've found out like some others that upping the voltage too much leads to crashes. As a matter of fact, I only increased the voltage .025 from 1.175 to 1.200 and that seem to be the most stable.

With just that little voltage increase I am running 1225/1600 in crossfire. Tested that last night and it looped Heaven 2.5 for two hours straight with no crashes/artifacts in eyefinity.

If I increase the voltage range from 1.225 to 1.300 I gain no extra speed capability and in fact the computer crashes. All of this with the temp's in check (below 68C).

So these chips don't necessarily respond well to more voltage. This also means that water cooling is pointless as running 1225/1600 only get's my cards to around ~65C. (unless noise is a big concern for you). Remember these are crossfire frequencies which will almost always be lower than single card frequency capability.
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post #512 of 38701
Nah, you"re wrong. Probably that something is getting too hot on your cards, like VRMs, or something else. Probably that Afterburner and GPU-Z are not giving the right readings since the 7970 is brand new. Totally normal

Alot of LN2 benchers and tiborr fom EK have confirmed that the 7970 OC are temperature related: ''10°C colder GPU yields at least 20MHz on the GPU at the same Vgpu.''

Look at tiborr OC with an Ek waterblock. 1350 on the core. Proof.

Temp is everything with those cards. wink.gif You're on air. You're stuck. Logical.
Edited by Levesque - 1/12/12 at 2:22pm
    
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post #513 of 38701
Thread Starter 
Quote:
Originally Posted by eux View Post

Quote:
Originally Posted by Evil Penguin View Post

Which cards did you previously have installed?

I had a 5970 installed.
I doubt it's the actual cards...
Perhaps it's time for a clean Windows installation?
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post #514 of 38701
Quote:
Originally Posted by Evil Penguin View Post

I doubt it's the actual cards...
Perhaps it's time for a clean Windows installation?

I hope so, I'm going to reinstall Windows now and see if that fixes it.
post #515 of 38701
Quote:
Originally Posted by Levesque View Post

Nah, you"re wrong. Probably that something is getting too hot on your cards, like VRMs, or something else. Probably that Afterburner and GPU-Z are not giving the right readings since the 7970 is brand new. Totally normal
Alot of LN2 benchers and tiborr fom EK have confirmed that the 7970 OC are temperature related: ''10°C colder GPU yields at least 20MHz on the GPU at the same Vgpu.''

Look at tiborr OC with an Ek waterblock. 1350 on the core. Proof.
Temp is everything with those cards. wink.gif You're on air. You're stuck. Logical.

What part of single GPU/single monitor overclock not always equaling a stable crossfire Eyefinity overclock seems to escape you? 10 C difference for 20Mhz isn't much at all and no one cares about LN2 benching as that doesn't apply to gaming or anything of significance. Going through all of the trouble for LN2 benchmarks seems like a big ordeal just to get a little frequency screenshot. Just because Tiborr has a single 7970 that can clock to 1350 using a single display doesn't mean they all can or that all will be able to push those frequencies in crossfire and Eyefinity. There are users on here that can't even squeeze 1100Mhz out of their single 7970.

Oh and quit the non-sense about not comparing 3GB 580's to the 7970's because AMD is on "beta drivers", whatever that is. The AMD driver team has had months and months with physical 7970's to work on drivers. By that logic, you could call every driver a "beta" driver.

Don't get me wrong, I am quite impressed with the 7970 and myself getting a 300Mhz overclock on near stock volts and stable in crossfire and Eyefinity is quite nice. Although I suspect on water the most I'd squeeze out of them is another 100Mhz which would be 5% or less performance increase.
Edited by CallsignVega - 1/12/12 at 2:50pm
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post #516 of 38701
Quote:
Originally Posted by Outcasst View Post

Made a video of the stuttering problems I'm having in SWOTR (and other games).You can clearly see the sudden jolts where some frames are dropped. Not sure whether this is microstuttering or a problem with the game itself and AMD cards.
Only really noticeable when Vsync is enabled, which is how I want to play. Was smooth as butter on the 580 SLI setup.
Happens worse in other areas, just wanted to do something quick.

That just looks like internet lag to me... Maybe if I was actually playing I might notice it more, but its hard to notice in that video, it just looks like internet spiking issues where a frame or 2 is dropped because the ping spikes.
post #517 of 38701
Quote:
Originally Posted by RussianJ View Post

Ordered mine today, overnight shipping so should be here Saturday morning. First time buying a new toy at launch.

I kind know how you feel, although I did buy a Sandy Bridge set up at launch, the 7970 is the first video card since I bought an 8800GT on launch day. Ever since then Ive been buying my buddy's old GPUs after he upgraded (went from 8800GT to GTX260, to GTX260 SLI, to 5870, to 5870CF to 7970).
post #518 of 38701
Quote:
Originally Posted by CallsignVega View Post

Tahiti doesn't always like more voltage! I've found out like some others that upping the voltage too much leads to crashes. As a matter of fact, I only increased the voltage .025 from 1.175 to 1.200 and that seem to be the most stable.
With just that little voltage increase I am running 1225/1600 in crossfire. Tested that last night and it looped Heaven 2.5 for two hours straight with no crashes/artifacts in eyefinity.
If I increase the voltage range from 1.225 to 1.300 I gain no extra speed capability and in fact the computer crashes. All of this with the temp's in check (below 68C).
So these chips don't necessarily respond well to more voltage. This also means that water cooling is pointless as running 1225/1600 only get's my cards to around ~65C. (unless noise is a big concern for you). Remember these are crossfire frequencies which will almost always be lower than single card frequency capability.

What is max voltage/speed of each card, tested that yet?
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post #519 of 38701
Quote:
Originally Posted by Outcasst View Post

Made a video of the stuttering problems I'm having in SWOTR (and other games).

You can clearly see the sudden jolts where some frames are dropped. Not sure whether this is microstuttering or a problem with the game itself and AMD cards.

Only really noticeable when Vsync is enabled, which is how I want to play. Was smooth as butter on the 580 SLI setup.

Happens worse in other areas, just wanted to do something quick.

It microstutters because the game doesnt support crossfire. When I had 6950s I got the same fps with 2 or 1 card with eyefinity even. They would also run at odd usage % like 90 and 60. This is why I went from 2 6950s to a single 7970.
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post #520 of 38701
What CAPs are people using with the 7900 drivers?
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