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SLI Overclocking on 680's?

post #1 of 9
Thread Starter 
Hey guys. I am in need of some advice. I was considering OC'ing the two 680's in my sig rig and needed some help with where to start and what to bench with. First off, I was wondering if EVGA Precision X is a decent OC'ing tool or not. Secondly, how should I go about effectively OC'ing the cards, especially with SLI enabled? Third, and lastly, what are the best benchmarking programs to test for stability?

Thanks in advance. As usual, ask if you need more info biggrin.gif
post #2 of 9
I have SLi 670s, which are basically 680s with messed up die tongue.gif
I use Precision X to OC my card, and I find it fitting my needs just fine. You will get two individual sliders to adjust the OC amount for each card (If you uncheck Sync and restart PrecisionX). Some people say PrecisionX gives unstable OC and prefers MSI afterburner but that wasn't my experience and I never really used afterburner so I can't comment on it.

If you have Tomb Raider (2013), I find that game is a good indication of how stable your OC is. Turn 2X AA on in game without TressFX and it will really stress your card out (everything else maxed).
post #3 of 9
Thread Starter 
Quote:
Originally Posted by Biakuwai View Post

I have SLi 670s, which are basically 680s with messed up die tongue.gif
I use Precision X to OC my card, and I find it fitting my needs just fine. You will get two individual sliders to adjust the OC amount for each card (If you uncheck Sync and restart PrecisionX). Some people say PrecisionX gives unstable OC and prefers MSI afterburner but that wasn't my experience and I never really used afterburner so I can't comment on it.

If you have Tomb Raider (2013), I find that game is a good indication of how stable your OC is. Turn 2X AA on in game without TressFX and it will really stress your card out (everything else maxed).

I'll keep Tomb Raider in mind, thanks! What about voltage controls for PX?
post #4 of 9
PrecisionX does offer Voltage control but 600 series card has their voltage locked. Meaning you can't really change it easily with software, unless you have one of those cards with voltage unlocked (MSI 680 PE for example). So I didn't really change my voltage. There is moded Bios that will increase max voltage from 1.174 to 1.21. I heard some people were able to flash 770 bios and get higher voltage but I never tried it, you can probably read more about it in the thread listed below.

Here's the thread on OCN: Overvolt Bios Mod 680/670s:

http://www.overclock.net/t/1289489/gtx-600-series-unlocked-voltage-bios-downloads-and-tools
Edited by Biakuwai - 10/8/13 at 4:22pm
post #5 of 9
nvm.
post #6 of 9
Thread Starter 
Quote:
Originally Posted by Biakuwai View Post

PrecisionX does offer Voltage control but 600 series card has their voltage locked. Meaning you can't really change it easily with software, unless you have one of those cards with voltage unlocked (MSI 680 PE for example). So I didn't really change my voltage. There is moded Bios that will increase max voltage from 1.174 to 1.21. I heard some people were able to flash 770 bios and get higher voltage but I never tried it, you can probably read more about it in the thread listed below.

Here's the thread on OCN: Overvolt Bios Mod 680/670s:

http://www.overclock.net/t/1289489/gtx-600-series-unlocked-voltage-bios-downloads-and-tools

I'll look into that. Maybe play with the Power Offset and Core Clock sliders and try that.
post #7 of 9
I have 2 overclocked 680's. Using Precision tuner X and never had a problem. The program gives full control over your cards including voltage control but you will find that you won't need to change voltage as i have found it just ensures instability for my cards in particular. They auto ramp to 1175 voltage so if anything you can just force each card to run 1175. Voltage will still go down when not in use.

I kept my cards linked while i overclocked but as Biakuwai stated you can unlink them and give individual clocks.

I primarily used Unigine Heaven for quick stability testing and tweaking and finalized my testing playing the games i normally play.

Current clocks are


+500 memory and +100 clock should be a good base clock for your cards then go higher or lower from there.

Goodluck! biggrin.gif
Edited by MiniMaster - 10/8/13 at 6:12pm
post #8 of 9
i use a modded bios on my 670's both boost to the same clock so i can sync them together and have them overclock the same thumb.gif

both cards will run at the slowest cards speed,
so if one card can oc to 1306mhz but the second card can only get 1254mhz they will both only run at 1254mhz wink.gif
Edited by lilchronic - 10/8/13 at 6:33pm
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Daily Rig
(21 items)
 
Bench Setup
(19 items)
 
 
CPUMotherboardGraphicsRAM
5820k 4.7Ghz @ 1.28vcore / 1.88vccin Gigabyte x99 SOC Champion EVGA OG Titan X @1405 / 8000Mhz 1.174v G.SKILL Trident Z 32GB 3200Mhz CL14 
Hard DriveHard DriveHard DriveHard Drive
2x Intel 520 120Gb SSD in RAID 0  Intel 180Gb 530 SSD OS Drive 2Tb WD HDD  2x Intel 730 SSD 480GB in RAID 0 
CoolingCoolingCoolingCooling
2x HWLabs GTX360 Black Ice in Push Pull EK blocks for CPU / GPU's 6x corsair sp120 2350RPM 6x Ek Vardar 120 F4's 2200rpm  
OSMonitorKeyboardPower
windows 10 Predator XB271HU Razor blackwidow cooler master V1000 
CaseMouseMouse PadAudio
Corsair 780T EVGA TORQ x10 evga mouse pad 2.1 audio / Hyper X cloud II 
Other
EK pump / res 
CPUMotherboardGraphicsGraphics
6600k Z170M OC Formula GTX780Ti AMD HD6450 
RAMHard DriveHard DriveHard Drive
Trident Z 3600Mhz cl16 2x8GB 120Gb intel 520 120Gb intel 520 64Gb adata ssd  
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750Gb WD Black Sony  F1 Gemini CPU Pot Tek - 9 Fat 
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custom loop two 240rad's xp,W7,W8,W10 x-star 2560x1440  Rosewill Quark-650 Platinum / Antec HCP-850 Pla... 
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post #9 of 9
Well this is how I OC'd mine stock EVGA 680s SLI:

  • For OC you can use EVGA Precision X, as for me it is the easiest tool out there
  • For stability test I used Furmark, crack up all the settings and see if you can withstand 10 secs torture
  • For bench you can use 3D Mark Firestrike

So far my settings on Precision X are:

GPU CLOCK OFFSET: +170
MEM CLOCK OFFSET: +600
VOLTAGE: 1050 mV

24h stable

Single cards are able to OC a little more.
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