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GPU Overclock Becomes Unstable At 65 Degrees

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  • Overclocking
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November 19, 2013 12:41:24 AM

So I decided to start screwing around with some overclocks on my ancient LGA775 rig from way back when (2007) in order to get some experience OCing before I move on to a new computer I'll be buying at some point in the next two months.

Anyways, I decided to start off by OCing my (ancient) Sapphire Vapor-X 5770 through CCC's Overdrive function. Many a test later, I've discovered that the card runs stable to a core clock of 930MHz (default is 860MHz). Going up to 935MHz causes video drivers to start crashing regularly in the two games I've done testing on - ArmA3 and Black Ops 2. I have not overclocked the card's memory and I'm running the GPU fan at an obscenely loud 100% for testing purposes.

That's fine (I'm not expecting miracles from a low-end, four-year-old card), but I am a bit surprised that the GPU is failing before CCC even reports it hitting 70 degrees Celsius (the highest I've seen it go is around 67 degrees) - the thing is rated to 90 degrees, after all.

My drivers are fully updated and the card is perfectly stable at default clocks. My PSU is an (also very old) Corsair VX550, which I'm assuming should not be an issue in this matter.

Anyhow, I'm not concerned by this so much as I am curious, and I was wondering if anyone could shed a bit of light as to what exactly is going on here. Thanks!

More about : gpu overclock unstable degrees

a b K Overclocking
November 19, 2013 12:48:08 AM

ten % is about the max o/c to expect on a card that is so old the thermal compound has dried up between the heat sink and the gpu chip. I wouldnt say 10 % if it wasnt a vapor cooler. The memory will clock better. Re seat the whole cooler unit with fresh thermal compound if you want better results but more than 10 % will probably destroy it anyway.
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a b K Overclocking
November 19, 2013 12:52:37 AM

Very few graphics cards o/c more than 10 % gpu , maybe asus c.u. top and the frozer types. most clocked already over reference chip settings.
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a b K Overclocking
November 19, 2013 12:56:09 AM

He said very clearly that the card is running cool so obviously it has nothing to do with thermal compound.
Anyway, to the OP, you've almost certainly hit the point where the chip can't handle anymore clock without an increase in voltage. If you can figure out how to increase the voltage you can probably get a bit more out of the card. I don't know how to with that card though, or even if it is possible.
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a b K Overclocking
November 19, 2013 2:25:57 AM

ten % is about the max i expect from ANY gpu, and would trust those heat sensor readings as far as i could barf. The evidence is indicative 50 50 , despite the readings. To be sure, I would re seat the heat sink. It takes 35 minutes.
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a b K Overclocking
November 19, 2013 2:36:08 AM

Are you just making things up? Really? He should pull apart his graphics card because some random guy on the internet says so, despite the fact that the CARD ITSELF is telling him heat is not an issue? Where did you get this 10 percent from did you just make that up? What you said makes no sense. Even assuming what you claim is true, that 10 percent is the max he can OC, if that were true, wtf would he want to rip apart his card when he is already at 10 percent?
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a b K Overclocking
November 19, 2013 3:16:09 AM

Deuce65 said:
Are you just making things up? Really? He should pull apart his graphics card because some random guy on the internet says so, despite the fact that the CARD ITSELF is telling him heat is not an issue? Where did you get this 10 percent from did you just make that up? What you said makes no sense. Even assuming what you claim is true, that 10 percent is the max he can OC, if that were true, wtf would he want to rip apart his card when he is already at 10 percent?


I agree, it most likely just needs a bit more voltage to clock higher. The reported temps dont suggest its heat holding it back..

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a c 249 K Overclocking
November 19, 2013 4:58:52 AM

Deuce65 said:
He should pull apart his graphics card because some random guy on the internet says so, despite the fact that the CARD ITSELF is telling him heat is not an issue?


The temperature readings could easily be a complete false security seeing as how they're coming from the GPU and the memory chips or voltage regulators themselves, could actually only be partially covered with the thermal pads.

Pulling the entire heat sink assembly and inspecting under it, is a wise suggestion on a 4 year old graphics card that has now graduated to being overclocked.

Not only could the thermal compound on the GPU die or heat spreader be completely dried out, the thermal padding on the memory chips and voltage regulators could be a problem as well.

If there was any negligence in a perfectly good suggestion to the OP, it would be warning the OP not to reuse the old thermal padding, to replace the thermal pads along with the thermal compound.



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