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7970 OC Crashes Overclocking HELP

post #1 of 5
Thread Starter 
I have my 7970 at 1200mV, core clock at 1200mhz, and the memory at 1650. This overclock will pass the 3D Mark 11 and Heaven benchmark with flying colors and staying at around 70*C (its a reference card). But while in Crysis 3 singleplayer it will be around 79*C and the game will eventually crash. But the most annoying part of it is that it will not ever crash in Crysis 3 Multiplayer. Is this normal? and what should I do to make my overclock stable in Crysis 3 singleplayer? By the way how it crashes is it will turn the screen black only on the monitor I am playing on and I am using Afterburner for my OC. Thanks for the help guys thumb.gif
post #2 of 5
Quote:
Originally Posted by MainStageNews View Post

I have my 7970 at 1200mV, core clock at 1200mhz, and the memory at 1650. This overclock will pass the 3D Mark 11 and Heaven benchmark with flying colors and staying at around 70*C (its a reference card). But while in Crysis 3 singleplayer it will be around 79*C and the game will eventually crash. But the most annoying part of it is that it will not ever crash in Crysis 3 Multiplayer. Is this normal? and what should I do to make my overclock stable in Crysis 3 singleplayer? By the way how it crashes is it will turn the screen black only on the monitor I am playing on and I am using Afterburner for my OC. Thanks for the help guys thumb.gif

Yes it is normal. Not all things are even. The cooler your card is, the longer it can run at stable OC clocks. The more "intense" the card has to work, (note: that does not just mean running at 99%) the more likely the instabilities appear. Benchmarks are only synthetic representations of performance. What a user does with while playing is often much more challenging than any benchmark. For example, standing around in Crysis 3, and continuously spinning around 360, sinusoidally is extremely tough to render.

AMD drivers completely crash and are sloppily handled often throwing exceptions to the OS without a solid recovery method. This is the black screen afterwards.

Multiplayers are always reduced graphics but increased CPU load.

I think that covers everything. Reduce overclock or increase voltage. Stability is often dependent on the title/benchmark you are using and does not always translate well from program to program. Crysis 3 is a very intense GPU game on all fronts.
Edited by RagingCain - 3/13/13 at 8:29pm
Snowdevil
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Snowdevil
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post #3 of 5
Thread Starter 
Quote:
Originally Posted by RagingCain View Post

Yes it is normal. Not all things are even. The cooler your card is, the longer it can run at stable OC clocks. The more "intense" the card has to work, (note: that does not just mean running at 99%) the more likely the instabilities appear. Benchmarks are only synthetic representations of performance. What a user does with while playing is often much more challenging than any benchmark. For example, standing around in Crysis 3, and continuously spinning around 360, sinusoidally is extremely tough to render.

AMD drivers completely crash and are sloppily handled often throwing exceptions to the OS without a solid recovery method. This is the black screen afterwards.

Multiplayers are always reduced graphics but increased CPU load.

I think that covers everything. Reduce overclock or increase voltage. Stability is often dependent on the title/benchmark you are using and does not always translate well from program to program. Crysis 3 is a very intense GPU game on all fronts.

Wow great response Rep thumb.gif I do have a few more questions. What would you suggest I do to get the highest OC possible in a game? Since im already getting near or at 80*C in Crysis (I really hate reference cards tongue.gif ) i dont want to increase the voltage more than I have. But I was thinking to slowly reduce my core clock my about 5 MHz at a time till I get something that dosent crash after 30min of playing. Good idea or would that take a long time to get the right OC? On another note im going to be setting up my first watercooling loop with in the month and I was wondering what the most voltage you would put into a 7970? Is it just until I get the temps past where im comforable or is there kind of like a level where if you go past in will severily decrease the longevity of your card? Thanks again.
post #4 of 5
Quote:
Originally Posted by MainStageNews View Post

Quote:
Originally Posted by RagingCain View Post

Yes it is normal. Not all things are even. The cooler your card is, the longer it can run at stable OC clocks. The more "intense" the card has to work, (note: that does not just mean running at 99%) the more likely the instabilities appear. Benchmarks are only synthetic representations of performance. What a user does with while playing is often much more challenging than any benchmark. For example, standing around in Crysis 3, and continuously spinning around 360, sinusoidally is extremely tough to render.

AMD drivers completely crash and are sloppily handled often throwing exceptions to the OS without a solid recovery method. This is the black screen afterwards.

Multiplayers are always reduced graphics but increased CPU load.

I think that covers everything. Reduce overclock or increase voltage. Stability is often dependent on the title/benchmark you are using and does not always translate well from program to program. Crysis 3 is a very intense GPU game on all fronts.

Wow great response Rep thumb.gif I do have a few more questions. What would you suggest I do to get the highest OC possible in a game? Since im already getting near or at 80*C in Crysis (I really hate reference cards tongue.gif ) i dont want to increase the voltage more than I have. But I was thinking to slowly reduce my core clock my about 5 MHz at a time till I get something that dosent crash after 30min of playing. Good idea or would that take a long time to get the right OC? On another note im going to be setting up my first watercooling loop with in the month and I was wondering what the most voltage you would put into a 7970? Is it just until I get the temps past where im comforable or is there kind of like a level where if you go past in will severily decrease the longevity of your card? Thanks again.

Haha, I have one of the highest water clocks for Crossfire and I topped out around 1357MHz with 1.300V. I was a little lucky having two great cards (both references wink.gif).

Reducing clocks by 5 MHz will take long, try 10 or 15 MHz at a time. You are losing very very very small amounts of performance. You also have to understand that the original 7970 starts at 925 (even the 1GHz are the same hardware) so you are overclocked by 30%! You aren't getting any more performance and the numbers at this point are bragging rights. Temperatures is usually what kills cards. Too much voltage sure, but you need more voltage as temperatures increase to maintain stability, thereby in my mind, temperatures are to blame.

A good 24/7 overclock is not the highest overclock, its a good overclock, with very little additional voltage, that has great temperatures. Too high or too low is often pointless outside of benchmarks.

For example:
1100 MHz is good, 1150MHz at the same voltage and temperature would be better.

Benchmarking has little affect on card longevity, unless you go too far and kill it. It is how you run your card the other 99% of the time that usually kills the card. You don't need overclocks sitting on the forums for example. Unless Flash has gotten too bloated these days..

Regarding watercooling, best advice for that is talk to watercooling guys in the forums and get starting out info there. Keep in mind it is a huge investment.
Snowdevil
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Snowdevil
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ASUS G750JM
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CPUMotherboardGraphicsGraphics
[i7 4790K @ 4.4 GHz (1.186v)] [Asus Sabertooth Z97 Mark S] [nVidia Geforce GTX 1080] [nVidia Geforce GTX 1080] 
RAMHard DriveCoolingOS
[G.Skill 32GB DDR3 2133 MHz] [Crucial MX100 256GB] [Phanteks PH-TC12DX] [Win 10.1 Pro] 
MonitorMonitorKeyboardPower
[LG 29UM65 (2560x1080)] [QNIX Evo II LED (2560x1440)] [WASD v2 Tenkeyless] [NZXT Hale90 v2 ] 
CaseMouseMouse PadAudio
[ThermalTake GT10 Snow Edition] [Razer Mamba - Chroma] [Razer Kabuto] [Razer Man O' War] 
CPUMotherboardGraphicsRAM
i7 4770HQ Intel HM87 Express Chipset Geforce GTX 860M 8GB DDR3L 1600 MHz 
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Samsung SSD EVO DVD-RW Stock Windows 8.1 
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post #5 of 5
Thread Starter 
Again Thanks for the great response thumb.gif
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