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Overclocking gtx 670's in sli.

setter

setter

setter

Caporegime
Joined
14 Dec 2005
Posts
28,067
Location
armoy, n. ireland
Im running two gtx 670 wf x3's in sli. For games they run anything im playing grand at stock speed. However, id like to get a bit more out of them for benchmarking. The top card, (purchased a year ago) is a pretty decent clocker, +130 core/+770 memory. Bench stable at theese clocks. The lower card i bought recently, ive yet to test it by itself. But trying with both at +90/+500 synced in afterburner results in driver crashed errors with heaven etc. Would i be best of testing the newer card to find it's limit, then run both at theese clocks in sync. Or can i run both unsynced at different oc settings. Stock boost speeds per card are.

Gpu 1, 1189 mhz

Gpu 2, 1150 mhz

Memory speed on both at 3005 mhz.
 
I can run my cards at higher clocks individually but when they are in SLI, they don't quite make it (not far off). I found when they were under water, I could get more out of them as well.

I would still do each card separately and depending on your patience in benchmarking, depends how much you can push them. You can alter each cards speeds by unticking the link box in Precision X or the same sort of thing in AB iirc and then adding what you know the top card can do to that and then what you know the bottom card can do and then adding that to that. If it fails, nock it back 7Mhz on both and repeat.

When I was going for top scores, I run both my cards unlinked, purely because my top card is a little faster than my bottom card and I know that I could score more by having separate clock speeds.

Hope that all makes sense? :)
 
Does make sense, cheers mate.:)

Just now with both synced, ran them at +80 core, +500 memory. Resulting in boost clocks of.

Gpu 1, 1267 mhz core, 3506 mhz memory, stock boost is 1189 core, 3005 memory.

Gpu 2, 1228 mhz core, 3506 mhz memory, stock boost is 1150 core, 3005 memory.

Completed fire strike fine, fans set to 85%. Temps of 70c and 54c. Ill post result in the fs thread.
 
LOL, im not that brave, it would probably blow up, then i would definately have to rma this card as its at its limit already, Although i will get 1.2v through it with a modded bios. :D
 
Ive considered a modded bios, possible that it might give my waeaker card a bit of a boost. And allow the better one to run even higher. Problem still regardless is keeping the top one cool. The pitfall of non ref cards in sli.
 
680biospic.jpg


That is a 680 BIOS and as easy as that to change the fan speed to 100%. You can also set your clocks, boost clocks, voltages (limited to the cards max volts) and all other bits and bobs.

If you are comfortable flashing a BIOS on a GPU, this is easy peasy :)
 
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