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[Official] MSI GTX 680 Lightning Owners Club - Page 594

post #5931 of 7827
Okay ! But getting a second 680 is like 2x performance ? And which power supply do I need to run this SLI ? (are you french ? biggrin.gif)
post #5932 of 7827
Quote:
Originally Posted by fantaziz View Post

Okay ! But getting a second 680 is like 2x performance ? And which power supply do I need to run this SLI ? (are you french ? biggrin.gif)
No, you won't gain 2x the perf you've got with one. Check some review like this one by guru3d, some games really like SLI, some other don't.
As for the power supply, a 850w should be enough, but it's more about the amps of the rail(s).
I had an Enermax Platimax 850w (still have it, in spare), but it has 4 rails of 30A, and the 680 needs 38A (the 580 needed 42A, I had shutdown cause of that), so one rail ain't enough. Now with the Platimax 1000w with one single rail of 83A, it's no problem.
Yes I am French (see my Location tongue.gif)
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post #5933 of 7827
What is the best power supply for this SLI then ? Because 1000w is a bit too much no ? Maybe this one ?http://www.materiel.net/alimentation-pour-pc/antec-hcg-900w-62026.html (au fait je suis français aussi wink.gif
post #5934 of 7827
Quote:
Originally Posted by fantaziz View Post

Ok ! Thank for your help kimir smile.gif

Now I have flashed my bios to the 80.04.28.00.3a one...

What are safe overclock settings that every 680 lightning should be able to run ? I just want to have the maximum performance, not push it beyond the limits wink.gif

Thank for your help biggrin.gif

For me, "safe" = the voltage and temp I'm comfortable with for everyday use. I think most would agree. Make the OC fit the voltage and temp you are comfortable with. You can turn up voltage to +100 for benchmarking, to see what the gpu will do. But for everyday use, I choose a target voltage, meaning a target temp, and tweak until I get the core freq as high as I can, stable, at that target. For me, the target is +50mv, which yields about 1.240v under extreme load with excellent temps, all under 60c regardless of load. This worked out to +108 -- about 60mhz lower than my highest stable clock (+168), but by not pushing the core so hard I was able to push the mem another +200 to +700, so I got back a little of the lost performance. Everyone will have a different value for the voltage/temp they are comfortable with for everyday use. Choose the voltage and temp that *you* can live with, and make the OC fit.
post #5935 of 7827
Quote:
Originally Posted by fantaziz View Post

What is the best power supply for this SLI then ? Because 1000w is a bit too much no ? Maybe this one ?http://www.materiel.net/alimentation-pour-pc/antec-hcg-900w-62026.html (au fait je suis français aussi wink.gif
yeah 1000w is overkill with 680, even OC'ed, see this topic.
I recommend you a modular one, 80+ Gold preferably, this one should be good if you are on budget and this one would be top the top notch. There is also the brand preference, I don't really like Antec biggrin.gif
(woohoo, un frenchie cheers.gif)

Totally agree with you wiredg, I'm more concern of the temp than the voltage tho.
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post #5936 of 7827
My GTX 680 lighning can't handle more than +90 Core clock and +210 Memory Clock even at +100mV of core voltage... frown.gif Is it normal ?
post #5937 of 7827
Just did the artmoney hack to break 1400 MHz, and while benching with Unigine Valley everything works fine for about half of the bench (scene 8 - 9), but after that fps drop to 15-20. The bench finishes without crashing and artifacts, but with very poor score. Gpu usage, voltage, core and memory aren't showing any drops. Any ideas? I'm using stock cooler, 100 % fan speed, temps never go above 66 C.

Thanks in advance.
Quote:
Originally Posted by fantaziz View Post

My GTX 680 lighning can't handle more than +90 Core clock and +210 Memory Clock even at +100mV of core voltage... frown.gif Is it normal ?

Which AB are you using? Did you move the bios switch to LN2?
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post #5938 of 7827
Quote:
Originally Posted by fantaziz View Post

My GTX 680 lighning can't handle more than +90 Core clock and +210 Memory Clock even at +100mV of core voltage... frown.gif Is it normal ?

I think it is. My new lightning needs +69mv to go +80clock. I've still to play with the memory but +300 seem to be stable (didn't try higher). I'll probably settle at 1280 because I'm not comfortable going much higher than the 1.28v it's currently using.

My ASIC = 77.5%. I think that these companies use the best binned chips for the early adopters so they do free marketing commenting how good the ASIC is and how much overclock and then after a time they use worse chips. It was the same with the Sapphire 7970 Ghz Vapor-X, the first ones (I had one) had a really good ASIC score for everybody on the forums, later (I also had one when the first one broke) people starting to get cards with ASIC in the lower 60 (my second one was a 65%).
Edited by juanjux - 2/20/13 at 11:31am
post #5939 of 7827
SK019, I use the 80.04.28.00.3a bios (flashed it yesterday)

juanjux, .......this is not cool frown.gif
Edited by fantaziz - 2/20/13 at 11:34am
post #5940 of 7827
Just to be sure, you are using AB 2.3.1, did you edited your card profile, the cfg file?
see page 1 if you didn't (the Tweaking Afterburner 2.2.4).
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