31.7°C is not friendly.

I know, only one small window, and a fan blowing air out. When summer really hits, it can become 35°C with only one PC active, I need one at least.

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Greetings from TJ

The GPU clock went to 974MHz, but all GPUGRID WU's have failed within a few seconds afterwards. Four errors in a row. I slowly become mad....

Shouldn't that GPU be running at 900MHz? That could be the reason for the failures, when you uninstall Precision X and After Burner, do you remove the profiles too? If you don't, they could be kicking in again as soon as windows starts, I had it happen to me after uninstalling Precision X and leaving the profiles behind.

The GPU clock went to 974MHz, but all GPUGRID WU's have failed within a few seconds afterwards. Four errors in a row. I slowly become mad....

Shouldn't that GPU be running at 900MHz? That could be the reason for the failures, when you uninstall Precision X and After Burner, do you remove the profiles too? If you don't, they could be kicking in again as soon as windows starts, I had it happen to me after uninstalling Precision X and leaving the profiles behind.

I don't know about the clock. It 951MHz did it when I first installed it, and saw that a few days ago still. It did the Einstein WU's overnight. I have now set the clock to 900MHz and it is doing a Nathan LR at the moment.
What will happen when I reduce the Mem clock? It set itself to 2178MHz. Skigven adviced to set it to 400 if it wouldn't work, but as it does, I left the "standard" setting.
Indeed good tip about the profiles, but at de-installing I got that message so I removed the profiles as well.

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Greetings from TJ

I guess you can wait and see what happens now, come to think of it, I was using both After Burner and Precision X when that weird problem happened with profiles loading and the apps had been uninstalled. The memory runs at 4100MHz so that should be 2050MHz to get it at stock speeds and stable with the GPU at 900MHz.

When I lower the voltage little from the GTX550Ti, I see that the GPU clock stays the same (I brought it up to 918 slowly) but temperature dropped from 73 to 69°C and GPU load stays the same (91%).
Is it okay to lower to voltage? What is its effect on crunching? How low can I the voltage bring?
Thanks.

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Greetings from TJ

So long as that voltage works its a good setting as it saves you electric and reduces heat output.
Sometimes reducing the voltage will cause the WU to fail, but as you have dropped the clocks it could well be fine. Leave it and see if the task completes. Don't mess about too much or you will learn nothing; if you keep changing setting you don't really find anything out - it takes time to know if a setup is really good (sometimes days and many tasks). I think you should stick at 918MHz and don't go over it. If tasks fail drop back down to 900MHz and if they still fail increase the Voltage again.

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So long as that voltage works its a good setting as it saves you electric and reduces heat output.
Sometimes reducing the voltage will cause the WU to fail, but as you have dropped the clocks it could well be fine. Leave it and see if the task completes. Don't mess about too much or you will learn nothing; if you keep changing setting you don't really find anything out - it takes time to know if a setup is really good (sometimes days and many tasks). I think you should stick at 918MHz and don't go over it. If tasks fail drop back down to 900MHz and if they still fail increase the Voltage again.

Thanks I leave that GTX550Ti as it is, I am to happy that it is working fine again at 69°
But on the other quad the 660 is running at 74°C. I would like to have that little lower. But with Precision X or Afterburner it is impossible to lower (or increase) the Core Voltage (not selectable). Both EVGA cards both same Precision X version but with different setting. Is that something from the card? Can it be passed in a way to lower that voltage little?

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Greetings from TJ

Thanks I leave that GTX550Ti as it is, I am to happy that it is working fine again at 69°
But on the other quad the 660 is running at 74°C. I would like to have that little lower. But with Precision X or Afterburner it is impossible to lower (or increase) the Core Voltage (not selectable). Both EVGA cards both same Precision X version but with different setting. Is that something from the card? Can it be passed in a way to lower that voltage little?

I'm using MSI Afterburner 2.3.0 and I can reduce the Core Voltage (mV), the power limit (%), Core Clock (MHz) and Memory Clock (MHz). W7, 314.22.

Reducing any of these should result in the use of less power, though reducing the Voltage could result in failures (but you don't know until you try).

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On your GTX660 an in fact all Keplers with boost, simply reduce the power target until the GPU reduces clock speed and voltage itself. This way you're guaranteed to remain stable, become more energy efficient and lower the heat output. All at a relatively small performance loss.

Open GPU-Z while crunching, check the current GPU power use and then adjust the limit to something lower than that.

On top of that you could still increase clock sped via the offset, but this again eats into the OC margin and may be unstable, just as OC at full voltage.

MrS

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Scanning for our furry friends since Jan 2002

Ah I see. I asked because the other GTX660 is in the T7400 and I have not set or changed anything there. Plugged it in, update to latest nVidia driver, set Precision X to automatic control temperature (not changed its curve) and let it run. It is running at 1123MHz and 1,162V at a steady 66°C for almost 82 hours non stop and GPU load around 85%. Nice I thought I will try that with my other 660 as well, but that´s another rig.
I thought my Alienware was awesome, but this old T7400 almost beats it.

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Greetings from TJ