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[Official] GTX 580 Overclocking Club - Page 216

post #2151 of 3582
Thread Starter 
i think its more a case of the components being used, I can hit 1000 on the core with just a 70mV bump:)
post #2152 of 3582
Quote:
Originally Posted by lightsout View Post
I think part of that is they allow more voltage. I'm pretty sure the evga cards could hit those clocks but the majority of users don't flash their cards with edited bios's.
Quote:
Originally Posted by Khalam View Post
i think its more a case of the components being used, I can hit 1000 on the core with just a 70mV bump
I agree with K here; it seems that the non-ref cards advertised for OCing use better VRMs and the like.

My reference EVGA (watercooled) is already modded and it hits a wall at 1015MHz (1.213v); perhaps it's the limitations of this card in particular but the high clocks on the bot seem to come from non-reference cards.

It was my hope that by modding the BIOS to allow more voltage, I could clock higher for benching...sadly, no. (980MHz@1.15v, 1015MHz@1.213v).
    
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post #2153 of 3582
Thread Starter 
ive noticed as well that Ferni scales better with cold, so for example a 980 oc will get a higher score at 62c then a 1000 oc at 70c
post #2154 of 3582
Quote:
Originally Posted by Khalam View Post
ive noticed as well that Ferni scales better with cold, so for example a 980 oc will get a higher score at 62c then a 1000 oc at 70c
Interesting...does this mean I should grab Crantana's GPU pot for sale in the forums and ditch this waterblock?

My GTX 580 doesn't break 55°C at load.
    
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post #2155 of 3582
Thread Starter 
yup, if your gpu doesnt go over 55c and it stopped scaling then you have hit a wall, if you can try to get it to 49-50c and check if its gone go even a couple mhz higher.
post #2156 of 3582
Quote:
Originally Posted by Khalam View Post
i think its more a case of the components being used, I can hit 1000 on the core with just a 70mV bump
But isn't that on just one of your cards? The best one. ALso what foes a 70mv bump equal to in total voltage for your card?
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post #2157 of 3582
Thread Starter 
the worst one i have does 985 at 1.168, it can do 970 at 1.118, second one can do 1000 at 1.168 and 985 at 1.118 (they are the same VID), and then the cherry i got does 1000 at 1.076 ( i can do 960 stock
post #2158 of 3582
Holy... Those do OC very well. I still prefer them under water then fancy air cooling cards. I wonder if the DCII cards are as good. I still don't think thats normal across all the lightnings. I saw another guy struggling to do better then 920. Maybe he was a noob idk.
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post #2159 of 3582
Hi guys, I just got my second 580 and want to OC them both, but I have only ever overclocked single cards.

My question is...and sorry if it is an known answer, but what is the recommended way to OC cards in SLI?

I tried this morning using Precision and OC Scanner and got some good results at stock voltage, but when I tried to adjust voltage using EVGA Eleet, I was unable to change the voltage on the second card.

Do I need to test them both as single cards first?

How can I apply the voltage to the second card? (they were linked via Precision)
post #2160 of 3582
Quote:
Originally Posted by daguardian View Post
Hi guys, I just got my second 580 and want to OC them both, but I have only ever overclocked single cards.

My question is...and sorry if it is an known answer, but what is the recommended way to OC cards in SLI?

I tried this morning using Precision and OC Scanner and got some good results at stock voltage, but when I tried to adjust voltage using EVGA Eleet, I was unable to change the voltage on the second card.

Do I need to test them both as single cards first?

How can I apply the voltage to the second card? (they were linked via Precision)
Typically, clocks in SLI are lower than what you'd get with a single card. I'd start with each card and find your max clocks; in SLI, you can expect to lower them by 20-50MHz.

I'm not familiar with EVGA Precision or Eleet (I use MSI Afterburner) but there ought to be an option for you to link both cards. That is, you can change voltages and clocks for both cards at the same time. Edit: To do so, you should enable the Sync option in Precision.

Otherwise, you ought to be able to select the card you want to OC and do so separately.
Edited by veblen - 10/24/11 at 7:49am
    
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