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[Official] AMD Radeon HD 7950/7970/7990 Owners Thread - Page 81

post #801 of 38701
I just get screen flickering... most likely a driver issue. A restart of the computer works just fine, but hopefully nothing is wrong with the card...
post #802 of 38701
I can also confirm temps = more of an overclock.

Getting the same OC on stock volts. If anything, more voltage makes my card worse at overclocking. Guess its because of the higher temp from the voltage bumps, Temps seem to out-weigh voltage.

Going to Jump on water cooling once i get some more money i think biggrin.gif
post #803 of 38701
Thread Starter 
I think at higher temps it requires more voltage.
Problem is... the reference PCB can't seem to deliver enough power to the core (it'll shut its self off).
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post #804 of 38701
Quote:
Originally Posted by Focus182 View Post

I can also confirm temps = more of an overclock.
Getting the same OC on stock volts. If anything, more voltage makes my card worse at overclocking. Guess its because of the higher temp from the voltage bumps, Temps seem to out-weigh voltage.
Going to Jump on water cooling once i get some more money i think biggrin.gif

I've said this before, the limiting factor in 7970 overclocks at this time is VRM temperature. Of cuorse this is transparent to the user since you cannot see the VRM temp (only GPU temp) but when you up the voltage really high your VRM temp skyrockets.

This is why I would really like the upcoming accelero cooler for the 7970, that should alleviate the issue a LOT.
post #805 of 38701
Quote:
Originally Posted by xoleras View Post

I've said this before, the limiting factor in 7970 overclocks at this time is VRM temperature. Of cuorse this is transparent to the user since you cannot see the VRM temp (only GPU temp) but when you up the voltage really high your VRM temp skyrockets.

+1.

That's exactly why I'm saying that the 7970s will OC much higher with waterblocks, since those toasty VRMs will stay nice and cool­ biggrin.gif

We are all imited by our VRMs temps right now on air.

Just wait and see. We will now soon enough.
    
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post #806 of 38701
Thread Starter 
VRM temps being the cause of all this is just a theory.
We would see throttling of the core clock before other problems occur.
People forget that the VRMs are deigned to run properly up to 125c.
When they meet or exceed that temperature, they throttle down the core.

The notion that the VRM temps are somehow causing the core to not clock as high (artifacts) doesn't make sense.
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post #807 of 38701
Quote:
Originally Posted by Evil Penguin View Post

VRM temps being the cause of all this is just a theory.
We would see throttling of the core clock before other problems occur.
People forget that the VRMs are deigned to run properly up to 125c.
When they meet or exceed that temperature, they throttle down the core.
The notion that the VRM temps are somehow causing the core to not clock as high (artifacts) doesn't make sense.

I'm pretty sure its correct. For instance, unless I turn my fans up to 70% manual I can't get a stable 1275mhz overclock. But the thing is, my gpu temp is around 75c at 50% fan and its not a throttle issue. I'm 99% certain its a VRM cooling issue.
post #808 of 38701
Maybe the 28hp process is somehow very sensitive to voltage leakage and temperature.
To much voltage at high temperature may corrupt the core or someting like that,
for some reason they put a more agressive than normal fan profile on the cards.
There could be a optimum relation between voltage/temperature/overclock.
post #809 of 38701
Thread Starter 
Quote:
Originally Posted by xoleras View Post

Quote:
Originally Posted by Evil Penguin View Post

VRM temps being the cause of all this is just a theory.
We would see throttling of the core clock before other problems occur.
People forget that the VRMs are deigned to run properly up to 125c.
When they meet or exceed that temperature, they throttle down the core.
The notion that the VRM temps are somehow causing the core to not clock as high (artifacts) doesn't make sense.

I'm pretty sure its correct. For instance, unless I turn my fans up to 70% manual I can't get a stable 1275mhz overclock. But the thing is, my gpu temp is around 75c at 50% fan and its not a throttle issue. I'm 99% certain its a VRM cooling issue.
There's a correlation between clock speed and temperature (voltage becomes important).
In order for the core to operate at a higher frequency AND temperature it would actually require more voltage it seems.
I say this because the core can operate correctly up to 95c.
The only little problem there is that the board will trigger OCP at a hardware level if the current is too high.

So no, the VRM temps don't have anything to do with it in this case.
Edited by Evil Penguin - 1/15/12 at 6:14pm
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post #810 of 38701
Well, we will all know soon enough. But either way I think we are all thinking the same thing.

Water cooling!
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