Couple of simple repetative questions on overclocking

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SickBumblebee

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Dec 13, 2012
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Hello my friends

I am getting a crash to desktop from playing with two Titan x's in SLI on Witcher 3. I overclocked them 20%, I put the max voltage up to 110% in MSI Afterburner and all my games have been running smoothly, no artefacts or crashes to speak of at all.

I'm just getting this crash to desktop in this single game with the sound continuing for a little while afterwards. Very strange. I thought with a bad overclock one would experience artefacts and glitching beforehand on screen? I will just add that I'm very sure it is the overclock as I can play for hours and hours without having a crash with the stock clocks. Members of the Witcher 3 community are having the same problem it seems. My question is below.

MY question is about overclocking if you would be so kind as I am slightly unsure of the 'Power Limit' setting. I have moved it to 110% as I was told to in a guide. I was under the impression that one would increase the core and memory as far as one can take it while maintaining a decent temperature. My temperature maxes out at about 80C playing Witcher overclocked, this is with two Titan x cards in SLI, the top one getting hotter obviously but never over 80. The power limit I see maxes at about 112% sometimes. Is this too much? Other than the crash I have mentioned I get zero problems with the overclock in Witcher or any other game. I get sick frames too and just worry I am damaging the cards with that Power Limit setting. I'm sure I could up the voltage and get some more out of my cards as the voltage is what's holding them back, but I don't want to. I just want to confirm that I have a safe overclock with the power limit set to 110% really.


Thank you.
 
Solution
4Ryan6


You don't know the brand name of the power supply?

The 1500w power supplies at Newegg right now.

Corsair is a single 12v rail
Enermax is a 6 12v rail
Silverstone is an 8 12v rail
Thermaltake is a 2 12v rail

I was running an Enermax Galaxy EVO 1250w with a single GTX Titan I made sure that I was using 2 independent rails of the 6 12v rails to power the Titan which is a 250w TDP card, I kept having overclock power issues with it until I changed it out for a Corsair 1000w single 12v rail power supply and the problems disappeared...
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rhysiam

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Mar 24, 2013
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Yeah, you're not at risk of doing damage with that OC. If it was stable (i.e. no crashes) it would be fine, but obviously things are being pushed just a little too hard.

As an anecdote, I had what I thought was a nice and stable OC for around 6 months, no issues at all until I started playing Witcher 3 and then I got crashes. Just dialed the OC back slightly and everything was fine. It seems like it really pushes GPUs that little bit extra. Why don't you just take 20Mhz or so off your GPU clock? That'll probably sort it and make no noticeable difference.
 
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Ryan_78

Ryan_78

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Jan 17, 2016
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Yes I agree. I believe the game is a GPU pusher. It's the same concept as occt. When I test with occt, it pushed my GPU too far and it always crashes. At 1125/1575, stock 1.256 volts, it pushes to 350-375w, more than 100w over the rated TDP of my card, at 250w. So I stopped testing with it. It works when I back it down a little. Usually if regular is fine, some games and apps will push it further, causing your OC to be unstable under that situation.
 
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SickBumblebee

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Dec 13, 2012
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Thanks. I have dialled the overclock back slightly, been playing a couple hours and things seem fine. I have also done a bit of research and apparently the problem seems to be also solved if you go into Nvidia control panel and change the settings of the card to 'prefer maximum performance' in power management mode.
 
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SickBumblebee

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Dec 13, 2012
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I was under the impression the algorithm used for the cards would stop the crash from happening. This is why I was a little bit worried of breaking my cards. I thought they wouldn't of been able to draw more power like that unless I upped the core voltage. I was simply checking the temperature and making sure the clock was stable in terms of artefacts etc. Thank you I am learning a bit now.
 
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4Ryan6

4Ryan6

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Apr 14, 2002
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Check this Out first:
Go into Nvidia Control Panel:
Click Manage 3D Settings:
Under the Global Settings Tab; Find:
Power Management Mode; and Make sure it is set to > Prefer Maximum Performance
Apply and save if it isn't set to that.

Second thought is the power supply sufficient to handle the SLI load of 2 250w TDP cards and is it a single 12v rail power supply?

I see recommendations out there that 850w is sufficient but there is no way IMO that is sufficient, I would not use any less than 1,000w and preferably 1,200w single 12v rail at 90a load, so what are you actually running to power this SLI Titan X setup.

Keep in mind when you overclock you increase the TDP so you have to have the power supply to handle it.

Are you overclocking the CPU as well as the GPUs?

Do you have any way to measure the actual load wall power you are pulling, like a Kill-a-watt meter?

Other possibilities, hardware driver related, or Nvidia Graphics Driver not playing well with your cards in SLI, you may need to roll back to a driver that works better with SLI.



 
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SickBumblebee

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Dec 13, 2012
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My PSU is actually 1,500watt multi GPU approved PSU. I know nothing more than that. CPU is overclocked slightly using an option that does it automatically for me in BIOS. Thanks for the recommendations!
 
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4Ryan6

4Ryan6

Champion
Apr 14, 2002
20,610
6
52,915


You don't know the brand name of the power supply?

The 1500w power supplies at Newegg right now.

Corsair is a single 12v rail
Enermax is a 6 12v rail
Silverstone is an 8 12v rail
Thermaltake is a 2 12v rail

I was running an Enermax Galaxy EVO 1250w with a single GTX Titan I made sure that I was using 2 independent rails of the 6 12v rails to power the Titan which is a 250w TDP card, I kept having overclock power issues with it until I changed it out for a Corsair 1000w single 12v rail power supply and the problems disappeared.

My problems did not happen until I overclocked the Titans power levels.

The specification label on the power supply itself tells you how many +12v rails it has, and the amperage load handling of each rail.

 
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Solution
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SickBumblebee

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Dec 13, 2012
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0
10,510


Unfortunately I had the computer custom built for Me by Dell. So I don't know the exact specification of the PSU. I would be fairly certain that it would be able to overclock 2 Titan x graphics cards though. It's not like I've raised the core voltage for instance. Thanks so much for the reply though.
 
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