unphoto Posted June 24, 2013 Share Posted June 24, 2013 Hi guys,I just finished setting up my Water cooled SLI setup.It's made up of 2 reference GTX 680 card's:Zotac ID 0EVGA ID 1I used the same waterblock on both so i know for sure that they are a match as far as the reference part is concerned.They are both 2GB versions and have the same clock settings (GPU-Z)So here's the thing:When i overclock the cards individually they have an awesome reach of 1303MHZ on the core and +400 on MEM.This is something i almost never run on but it can do Battlefield 3 on 2560x1440 with everything max (duh..) @100fps.When i overclock in SLI, i can see the boost clock mess's things up (Meter), the slave card boosts lower and there for uses lower voltages and so it crashes almost immediately.I can't even slide the Core + 40Mhz in AfterBurner or the cards crash....So i used kgb on the BIOS (xxxx.rom) and used nvflash to flash the new bios (1.212v) and even then i still really can't get a high clock.I customized some bios's in a multitude of variations and it never really is stable beyond stock..Help?Ps.This also posted under the water cooling section but i was not sure where this topic belongs, there is no real overclocking thread which i can find Quote Link to comment Share on other sites More sharing options...
wannab Posted January 1, 2014 Share Posted January 1, 2014 i hate to bump an old thread, but i too am faced with the same issue.In Evga Precision you could turn on kboost, but i think that only applies to the primary card.Perhaps you can user the nvidia tuner app and force boost for stability? Then just use a .bat to lower the clocks when only using 2D stuff?Ill try this when i get home, and post with results! Quote Link to comment Share on other sites More sharing options...
Zero989 Posted January 6, 2015 Share Posted January 6, 2015 Had the same issue with reference 680s, and I never found a good solution either. Voltage doesn't even help like you've found out.40Mhz was the max overclock on the cores I was able to achieve. Quote Link to comment Share on other sites More sharing options...
android_dev Posted January 22, 2015 Share Posted January 22, 2015 It depends on your ASIC quality and your PSU. A crappy PSU can have a potential to limit OC. Quote Link to comment Share on other sites More sharing options...
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