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[Official] MSI GTX 680 Lightning Owners Club - Page 177

post #1761 of 7827
Nice review. The extra voltage seemed to help them a bit more than it did for me. And I definitely hit the wall hard at anything over +100mv sadsmiley.gif
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post #1762 of 7827
IMO, its probably because you're using 2 cards in SLI; Single card overclocks are always better by a lot. My instability temperature threshold is low on GPU1 when running SLI, I have to keep it very very low in temps for complete stability... i'd take a guess if you removed your 2nd GPU altogether you'd get a bigger overclock with a single card. Thats how it always works usually.

I've oc'ed quite a few dual gpu setups and you'll never OC SLI to the same level unless you're on water generally speaking. In fact, i've gotten both of my cards over 1400 in single card quite easily but in SLI GPU1 becomes temperature limited because GPU2 is blowing hot air onto GPU1 and temps creep up slowly. My temperature instability threshold is low so obviously there's something in addition to core and VRM temps that is important - If I go past 65C on GPU1 in SLI I get artifacts while over volting. That is why I say 100% manual fan is best for OC and OV for maximum overclock benchmarking...some of the other components are getting toasty with high voltage I think (which explains the low temp threshold while in SLI - this doesn't happen in single card testing)

There is no easy way around the fact that GPU2 blows hot air onto GPU1 and that will always limit your OC headroom on aftermarket cooled cards. On water this is a complete non issue. I think you're entering this (I could be wrong) expecting a similar overclock in SLI as you would get in single card. That just isn't very likely to be honest..99% of users will never get as good of an overclock in SLI when they're really pushing things. Overvolting in single card is also a breeze while over volting in SLI can be problematic for the cards to sync and get along.
Edited by xoleras - 7/30/12 at 6:59am
post #1763 of 7827
Will get mine on Wednesday and will report back with my overclocks.
post #1764 of 7827
Quote:
Originally Posted by xoleras View Post

IMO, its probably because you're using 2 cards in SLI; Single card overclocks are always better by a lot. My instability temperature threshold is low on GPU1 when running SLI, I have to keep it very very low in temps for complete stability... i'd take a guess if you removed your 2nd GPU altogether you'd get a bigger overclock with a single card. Thats how it always works usually.
I've oc'ed quite a few dual gpu setups and you'll never OC SLI to the same level unless you're on water generally speaking. In fact, i've gotten both of my cards over 1400 in single card quite easily but in SLI GPU1 becomes temperature limited because GPU2 is blowing hot air onto GPU1 and temps creep up slowly. My temperature instability threshold is low so obviously there's something in addition to core and VRM temps that is important - If I go past 65C on GPU1 in SLI I get artifacts while over volting. That is why I say 100% manual fan is an absolute requirement for OC and OV for maximum overclock benchmarking...

I want to see how my bottom card responds, so I'm going to put that one in the top slot and leave the other out for testing. But when disabling SLI and testing the top card alone, even though I didn't remove the 2nd card, temps were noticeably better, but still got a horrible increase in performance from a ton of voltage. I'll see what happens with the bottom card tested alone later on tonight and let you know.
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post #1765 of 7827
Quote:
Originally Posted by xoleras View Post

HardOCP has a lightning review up with afterburner 2.2.3:
http://www.hardocp.com/article/2012/07/30/msi_geforce_gtx_680_lightning_overclocking_redux/1


that's a really good review and this card is bad ass!!!!
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post #1766 of 7827
Hopefully you'll find a workaround to this DPH, It really does suck that you hit a wall. I almost want to trade cards with you because I don't ever run it full speed, and my GPU1 is a definite golden chip... (I use vsync and do 24/7 cruising at 1300mhz / 0 voltage ). My setup is probably overkill for what I do TBH
post #1767 of 7827
Quote:
Originally Posted by dph314 View Post

I can't get ArtMoney to open it. Says I need to paid version?

Idk if you got it worked out or not as I am just starting to get halfway through the 70 posts I've missed lately but have you ran it as an administrator. I had the same deal until I did that.
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post #1768 of 7827
Card is back up to $599.99 plus shipping cost, this is the kind of stuff that I hate about newegg. Glad I bit when it was 569.99 with free shipping.
post #1769 of 7827
Quote:
Originally Posted by RobsM6S View Post

Card is back up to $599.99 plus shipping cost, this is the kind of stuff that I hate about newegg. Glad I bit when it was 569.99 with free shipping.
.


I really hope they release an extreme because I have a new catleap inc and will need more then 2 gigs to push it. galaxy is my only option being I don't support EVGA anymore. thumb.gif
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post #1770 of 7827
Quote:
Originally Posted by Valenz View Post

.
I really hope they release an extreme because I have a new catleap inc and will need more then 2 gigs to push it. galaxy is my only option being I don't support EVGA anymore. thumb.gif

Yep, evga is uninteresting to me these days and I dont care about the warranty because I never keep my cards for more than a year at a time anyway.
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