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[Official] AMD Radeon HD 7950/7970/7990 Owners Thread - Page 1475

post #14741 of 38701
Quote:
Originally Posted by Macke93 View Post

How much improvement in percentage compared to stock clocks? biggrin.gif
Earlier today I ordered a Powercolor HD 7950 PCS+, just have to wait a few days until I can play biggrin.gif

Stock clocks are 830/1250, let me run it at those clocks and I'll edit in the results.

Wow.. such a big jump.

830/1250 1.093v/1.6v


1285/1600 1.38v/1.625v


Edited by Kokin - 8/21/12 at 5:01am
    
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post #14742 of 38701
hey guys,

I've just submitted my request to become part of this group.

I have a sapphire 7970 OC edition running at 1100/1550. It has an ASIC quality of 54.3%. Is this a bad thing? I will be watercooling the card in the next few days, apparently low ASIC is good for watercooling?
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post #14743 of 38701
Quote:
Originally Posted by d3vour3r View Post

hey guys,
I've just submitted my request to become part of this group.
I have a sapphire 7970 OC edition running at 1100/1550. It has an ASIC quality of 54.3%. Is this a bad thing? I will be watercooling the card in the next few days, apparently low ASIC is good for watercooling?

Apparently so. I suggest Sapphire Trixx over MSI AB if you want to see higher overclocks due to a higher vcore limit.
    
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post #14744 of 38701
Unfortunately Trixx hasn't helped my cards. They are higher ASIC cards (both over 83%) so they have low stock voltage. Can't get them to do any more than 1230MHz / 1750MHz in Heaven 3.0 which gives me a frown.gif

post #14745 of 38701
Quote:
Originally Posted by Majin SSJ Eric View Post

Unfortunately Trixx hasn't helped my cards. They are higher ASIC cards (both over 83%) so they have low stock voltage. Can't get them to do any more than 1230MHz / 1750MHz in Heaven 3.0 which gives me a frown.gif

So higher ASIC is bad in some cases? Or can you just not adjust voltage on your cards? (Or do you not plan to?) smile.gif
 
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post #14746 of 38701
Quote:
Originally Posted by Kokin View Post

Apparently so. I suggest Sapphire Trixx over MSI AB if you want to see higher overclocks due to a higher vcore limit.

Id recommend looping a crysis bench and crysis 2 bench for stability testing. Unigine I found to be not hard at all on the cards. 3D mark 11 seems decent for stability too, especially for memory for some reason.
post #14747 of 38701
I'll try downloading them for stability testing later in the week. But for now, I'm really happy that I can get close to my intended goal of 1300mhz core. thumb.gif
Quote:
Originally Posted by Matt-Matt View Post

So higher ASIC is bad in some cases? Or can you just not adjust voltage on your cards? (Or do you not plan to?) smile.gif

A higher ASIC tends to be good for aircooling since there is less voltage leaking. This means less heat/power and this is what limits aircooled overclocking.

On the other hand, a lower ASIC means more voltage leaking and this gives more overclocking headroom. More heat/power is produced than normal, hence aircooling will suffer due to higher heat output, which would limit a higher overclock if you're getting into the 80C+.
    
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post #14748 of 38701
Quote:
Originally Posted by Kokin View Post

I'll try downloading them for stability testing later in the week. But for now, I'm really happy that I can get close to my intended goal of 1300mhz core. thumb.gif
A higher ASIC tends to be good for aircooling since there is less voltage leaking. This means less heat/power and this is what limits aircooled overclocking.
On the other hand, a lower ASIC means more voltage leaking and this gives more overclocking headroom. More heat/power is produced than normal, hence aircooling will suffer due to higher heat output, which would limit a higher overclock if you're getting into the 80C+.

So that's a win-win! If I get an extremely low ASIC i'll be looking at a Antec Kuhler 620 mod maybe or an aftermarket cooler.. thumb.gif
 
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post #14749 of 38701
Yeah, high ASIC means the cards have a lower stock voltage. Since you are only allowed a certain amount of voltage above stock, this limits the amount you can raise it. In TRIXX for instance I can set 1382mV but my cards only see about 1280mV or so (because of vdroop) which is currently limiting me to 1230MHz. One of the 7970 Lightnings that I sold to buy these Sapphire's would do 1275MHz while the other would only do 1215MHz.

Unfortunately overclocking is always a crap shoot...
post #14750 of 38701
Quote:
Originally Posted by Majin SSJ Eric View Post

Yeah, high ASIC means the cards have a lower stock voltage. Since you are only allowed a certain amount of voltage above stock, this limits the amount you can raise it. In TRIXX for instance I can set 1382mV but my cards only see about 1280mV or so (because of vdroop) which is currently limiting me to 1230MHz. One of the 7970 Lightnings that I sold to buy these Sapphire's would do 1275MHz while the other would only do 1215MHz.
Unfortunately overclocking is always a crap shoot...

I see.. So there's no BIOS or mod/hack to make them run more above the "max voltage" slider? smile.gif

EDIT: +Rep to you both.
Also what does ASIC stand for out of curiosity? smile.gif
Edited by Matt-Matt - 8/21/12 at 7:03am
 
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