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Is a Ref 7970 with an ASIC of 63.5% bad for OCing with ref cooler?

post #1 of 13
Thread Starter 
I've got a friend selling me his Reference Sapphire 7970 for $400, but the only downside is the ASIC is a little low being at 63.5%. Would I be able to OC this card as well as my identical card with an ASIC of 82.7% with them both in crossfire?

*Edit: OCing would be done with stock cooling, and with spacing between the two cards. My current card is @ 1125/1575 - 1.16v/1.6v and I'm hoping to get the same with the other card, with maybe higher voltages. I just don't want to go any higher than 85c on both cards. My current one only reaches around 80c max in BF3 Ultra @ 6080x1080.

Thanks guys for any info! - Jessekin32
Edited by Jessekin32 - 4/16/12 at 4:59pm
post #2 of 13
Thread Starter 
Anyone have any experience with an overclocked 7970 with an ASIC around 60%?
post #3 of 13
does he live in the same city? maybe you could get him to come over and you could overclock it before you buy. or if hes out of town, have him do some OC's and benchmarks so you can see how well it performs.
 
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post #4 of 13
I have 2 cards at roughly 80% and one card at 62.9% and all of them overclock about the same except the 62.9% one runs the coolest. ASIC quality doesn't seem to be indicative of anything
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post #5 of 13
Thread Starter 
Long story short, He's about 16 miles away from me, and my clunker won't make it there. Another friend is driving me up there to pick it up, and then back so that I don't: 1.) spend $15 less in gas, 2.) Risk blowing my already-having-issues tire, and 3.) Have company on the way up.

So making trips up there isn't really an option xD It does run fine, he's never bothered with OCing the card, and it's practically like new. For the price I'm getting it for, I don't even care if it has to stay at stock speeds, I'd just like to be a little prepared with some knowledge and expectations of what it COULD overclock like.

So it's not of vital importance that I find out from others what they can OC their cards like, I'm just curious biggrin.gif I have looked at that chart in the OP of the official 7970/7950 thread, and seen that people were able to get their lower ASIC cards to the same clocks I have on my higher ASIC card, but there was maybe three of them.
post #6 of 13
Quote:
Originally Posted by Jessekin32 View Post

Long story short, He's about 16 miles away from me, and my clunker won't make it there. Another friend is driving me up there to pick it up, and then back so that I don't: 1.) spend $15 less in gas, 2.) Risk blowing my already-having-issues tire, and 3.) Have company on the way up.
So making trips up there isn't really an option xD It does run fine, he's never bothered with OCing the card, and it's practically like new. For the price I'm getting it for, I don't even care if it has to stay at stock speeds, I'd just like to be a little prepared with some knowledge and expectations of what it COULD overclock like.
So it's not of vital importance that I find out from others what they can OC their cards like, I'm just curious biggrin.gif I have looked at that chart in the OP of the official 7970/7950 thread, and seen that people were able to get their lower ASIC cards to the same clocks I have on my higher ASIC card, but there was maybe three of them.

Well, Tslm has the same cards and from his claim, it seems like ASIC really dosent mean anything
 
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post #7 of 13
Thread Starter 
Quote:
Originally Posted by Tslm View Post

I have 2 cards at roughly 80% and one card at 62.9% and all of them overclock about the same except the 62.9% one runs the coolest. ASIC quality doesn't seem to be indicative of anything

I didn't see your reply! Thank you for this little bit of info xD I'm still a newborn with OCing GPUs, and just found out about ASIC. That's really weird that something of lower quality stays the coolest. hahaha.

Thank you for sharing, you honestly wiped and worry of not reaching compatible High OC's with these cards. +rep biggrin.gif

*Edit: What are your GPU's clocked at, and what temps are the hitting? Just curious. And I assume they are stock cooled...?
Edited by Jessekin32 - 4/16/12 at 8:02pm
post #8 of 13
Asic % or leakage level doesn't really have a correlation to overclocking, but it does have some bearing on voltage required to hit stock clock frequencies where high asic % means less voltage at stock frequencies. Once you overclock that kinda goes out the window however.
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post #9 of 13
Thread Starter 
Quote:
Originally Posted by tsm106 View Post

Asic % or leakage level doesn't really have a correlation to overclocking, but it does have some bearing on voltage required to hit stock clock frequencies where high asic % means less voltage at stock frequencies. Once you overclock that kinda goes out the window however.

Oh, so lets say the stock voltage for a card is 1100mv. If I OC it, it shouldn't take that much more of a voltage bump to make for a stable overclock? I.e: 1125/1575 @ 1160-1200mv?
Whereas I could have another card that needs 1050mv at stock, but still will need 1160-1200 for the same stable overclock? biggrin.gif

Correct me if I misunderstand. And thank you for clearing this up for me.
post #10 of 13
Quote:
Originally Posted by Jessekin32 View Post

Quote:
Originally Posted by Tslm View Post

I have 2 cards at roughly 80% and one card at 62.9% and all of them overclock about the same except the 62.9% one runs the coolest. ASIC quality doesn't seem to be indicative of anything

I didn't see your reply! Thank you for this little bit of info xD I'm still a newborn with OCing GPUs, and just found out about ASIC. That's really weird that something of lower quality stays the coolest. hahaha.

Thank you for sharing, you honestly wiped and worry of not reaching compatible High OC's with these cards. +rep biggrin.gif

*Edit: What are your GPU's clocked at, and what temps are the hitting? Just curious. And I assume they are stock cooled...?

They all do 1200MHz at 1.2v (1.18ish after vdroop). They sit at 72c with custom fan profile. Individually they only go a little higher

Theyre at stock most of the time though, I need a better cpu before ocing them is useful
Quote:
Originally Posted by Jessekin32 View Post

Quote:
Originally Posted by tsm106 View Post

Asic % or leakage level doesn't really have a correlation to overclocking, but it does have some bearing on voltage required to hit stock clock frequencies where high asic % means less voltage at stock frequencies. Once you overclock that kinda goes out the window however.

Oh, so lets say the stock voltage for a card is 1100mv. If I OC it, it shouldn't take that much more of a voltage bump to make for a stable overclock? I.e: 1125/1575 @ 1160-1200mv?
Whereas I could have another card that needs 1050mv at stock, but still will need 1160-1200 for the same stable overclock? biggrin.gif

Correct me if I misunderstand. And thank you for clearing this up for me.

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