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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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Main Rig
(16 items)
 
Bench
(15 items)
 
 
CPUMotherboardGraphicsRAM
8700k Maximus Apex X GTX 1080Ti G.skill 2x8GB 3600Mhz Cl 16 
Hard DriveHard DriveHard DriveCooling
960 EVO M.2 250GB x3 Intel 730 480GB Raid 0 2TB HDD 2x 360 rads 
CoolingCoolingCoolingCooling
EK Supremacy CPU Block / EK GTX 1080Ti Full Cov... EK D5 pump and Res Combo x6 Corsair SP120 x6 EK Vardar 120's 
OSMonitorPowerCase
Windows 10 XB270HU Cooler Master V1000 Corsair 780T 
CPUMotherboardGraphicsRAM
5820k x99 SOC Champion GTX 780Ti / GTX 980Ti Crucial Micron DDR4 
Hard DriveHard DriveHard DriveHard Drive
180GB intel 530 SSD /  120GB intel 520 SSD 120GB intel 520 SSD 2TB HDD 
Hard DriveCoolingCoolingCooling
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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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