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Need help overclocking SLI GTX 580's

post #1 of 5
Thread Starter 
Hello there OC community biggrin.gif

As the title implies, I am in need of assistance regarding overclocking my two GPU's.
First off, things you need to know:
  1. I am relatively new to the whole overclocking scene, so forgive me if I ask 'easy' questions
  2. I am aware that every part is different in oc'ing
  3. Sadly this is not my only issue atm, so here is the link the CPU overclocking post in the appropriate forum.
  4. This is the post that I will be referring to later on: Water cooling my rig
  5. Any help or input is greatly appreciated smile.gif


So let's get to it: I have been messing around with oc'ing my GPU in the last couple of days. Following these relatively old, yet more or less still relevant guides (I hope so at least haha): Info on the OC forums and a talented youtubers advice. As stated before, I am in no means experienced in this area, so some information given by these two sources may be completely wrong or outdated.

A couple of major problems/questions that I am facing:
  • I am running 2 GTX 580's in SLI mode on a Asus P8P67 Deluxe Mobo, but for some weird reason only ONE of the cards seems to get all the load under every circumstance and additionally the second GPU does not seem to be affected by any oc'ing or testing! I really mean everything: For instance in MSI Afterburner both cards are recognized and listed, as so in multiple other 'hardware recognizing apps'. Nevertheless though, does the 2nd GPU not respond to any input, be it from playing an SLI supported game or even during the stress test with the MSI Kombustor!

    This confuses me, since the cards are both recognized but only one seems to do all the work. I have checked and the PhysiX is set to automatic and I have slaved the GPU 2 to the master card.

    What I see during gaming/testing:
    GPU 1 ALWAYS 99% load, up to 80% fan speed, idle around 50 degrees Celsius
    GPU 2 has NEVER any load 0%, constantly 50% fan speed, always around 40 degree Celsius

    This is a mayor problem and needs to be solved/clarified/explained to me before anything else can happen.
  • I am doing the oc'ing with MSI Afterburner currently, but am wondering if there isn't a more stable/secure method for it? So that I don't need the program for instance, since I will be oc'ing even higher after I have implemented the watercooling mentioned in 4.

Dummy me hasn't written down the settings that I have already tried.
But I have followed the steps in the video/post and have tried increasing from 772 core clock to 822 and then 832. At this level I have hit the current temperate limit with my aircooling (running at about 80-85). Everything seemed to work fine during the stress test, but during playing a game the whole rig just froze to death.

Did I overclock it wrong or am I missing something really obvious?

I don't have a lot of data on oc'ing my cards yet, so this thread is more about asking you guys how to overclock them correctly and help me figure out how to do so.

As stated in 4., I am going to implement a wc loop, which will allow me to oc even further, so feel free to already post some suggestions to do so thumb.gif


Thanks for reading,
Mr KJ
Monsta
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Monsta
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BenQ XL2720Z 27" G15 Logitech Gaming keyboard (2009) HuntKey X7 900 (Total Power 900W) NZXT Phantom (Black) 
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post #2 of 5
This may be a stupid question, but firstly:

did you enable SLi by "optimizing 3d performance" or whatnot in the nVidia settings?

Also: are you using an SLi Bridge?

Once this problem is fixed we can address the actual overclocking, which is very straightforward on GPU's.

MSI afterburner works great. Typically, push the core clock, if artifacting etc., increase voltage (watching temps), push core further, rinse and repeat until you can't really push it anymore without sacrificing stability.

At this point you can divert your focus to pushing the memory clock as much as stability and temperatures permit.

Watercooling will make your cards far chillier, allowing you to up the voltage a lot more and get higher clocks/more stability.

Remember that it also depends on your GPU's specifically, as not all GPU's are equal in regard to how far they can be pushed. Additionally, if one of your GPU's is slower than the other in regard to max overclockability, it'll hold the other one back.

Once you get there, you can start considering whether you wanna mod BIOS or something which is another discussion
Edited by spikeSP - 6/29/13 at 9:26pm
post #3 of 5
Thread Starter 
Quote:
Originally Posted by spikeSP View Post

This may be a stupid question, but firstly:

did you enable SLi by "optimizing 3d performance" or whatnot in the nVidia settings?

Also: are you using an SLi Bridge?

Once this problem is fixed we can address the actual overclocking, which is very straightforward on GPU's.

MSI afterburner works great. Typically, push the core clock, if artifacting etc., increase voltage (watching temps), push core further, rinse and repeat until you can't really push it anymore without sacrificing stability.

At this point you can divert your focus to pushing the memory clock as much as stability and temperatures permit.

Watercooling will make your cards far chillier, allowing you to up the voltage a lot more and get higher clocks/more stability.

Remember that it also depends on your GPU's specifically, as not all GPU's are equal in regard to how far they can be pushed. Additionally, if one of your GPU's is slower than the other in regard to max overclockability, it'll hold the other one back.

Once you get there, you can start considering whether you wanna mod BIOS or something which is another discussion

This was also one of the first places I went to check and for whatever reason now it was turned off indeed. I do know though that it was on during the stress test.
So turning that back on (since my nvidia control panel has a mind of its own and likes to reset all the time -.-) has solved the single GPU issue in gaming completely. Both GPU's are getting load now and are being used.

BUT I have stress tested again after turning on and once again with the normal kombustor settings only one GPU will be used. So I went further and opened the MSI Kombustor up separately and used a different PhysiX test this time. And voila, both GPU's were being used in the test.
So I guess it is somehow related to the setting in the nvidia panel that concerns the PhysiX settings. Which is weird because I have set it to automatic and not assigned one GPU to it specifically.

The problem is not the card luckily, but somehow the overclocking still does not affect the second GPU.

Will edit later, in a hurry now.
Thanks for the reply though!
Monsta
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Monsta
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Seagate ST31000524AS ASUS DRW-24B3ST Crosair Cooling Hydro Series H60 High-Performan... Windows 7 Ultimate (x64) 
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BenQ XL2720Z 27" G15 Logitech Gaming keyboard (2009) HuntKey X7 900 (Total Power 900W) NZXT Phantom (Black) 
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post #4 of 5
NP. Make sure in the settings for afterburner you check off the box that says something along the lines of "Match graphics settings for both cards" - I forget the specific wording
post #5 of 5
Thread Starter 
Quote:
Originally Posted by spikeSP View Post

NP. Make sure in the settings for afterburner you check off the box that says something along the lines of "Match graphics settings for both cards" - I forget the specific wording

I have them slaved together, if it's that what you mean.

Now the random things I have noticed so far:
  • Sometimes the Nvidia panel just randomly likes to change my settings around. No idea why.
  • Running a stress test normally via MSI Kombustor seperately OR straight with the "K" button in MSI Afterburner ONLY uses ONE GPU at all times. Also I have no idea if the oc changes I make to the master card carry over to the slave card because of this.
  • When running a stress test specific to PhysiX, both GPU's get load.
  • When gaming though, both GPU's are used (Skyrim for example)
Monsta
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Intel Core i7 2600K P8P67 DELUXE EVGA GTX-780 Dual Classified ACX (GK110, 3GB) Kingston  
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Kingston  Kingston  Kingston  Seagate ST310005 
Hard DriveOptical DriveCoolingOS
Seagate ST31000524AS ASUS DRW-24B3ST Crosair Cooling Hydro Series H60 High-Performan... Windows 7 Ultimate (x64) 
MonitorKeyboardPowerCase
BenQ XL2720Z 27" G15 Logitech Gaming keyboard (2009) HuntKey X7 900 (Total Power 900W) NZXT Phantom (Black) 
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Logitech G502 PROTEUS CORE Noteblock.. Logitech Z906 AKG Gaming Headphones 
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Monsta
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Kingston  Kingston  Kingston  Seagate ST310005 
Hard DriveOptical DriveCoolingOS
Seagate ST31000524AS ASUS DRW-24B3ST Crosair Cooling Hydro Series H60 High-Performan... Windows 7 Ultimate (x64) 
MonitorKeyboardPowerCase
BenQ XL2720Z 27" G15 Logitech Gaming keyboard (2009) HuntKey X7 900 (Total Power 900W) NZXT Phantom (Black) 
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