[OFFICIAL] GTX 670 Overclocking - Page 100

After a little more testing, it seems like i reached max clocks.

+159 core, 1244MHz
+825 memory, 3829MHz

I've remounted the heat sink on the CPU more times than I care to remember. Have tried different amounts of TIM and varying application methods with no luck. Not too keen to disassemble the GPU. Everything in the system is running hot, with the exception of the motherboard and hdd temps. I'm quite pissed off as I spent extra on picking the low noise components to get a quiet system but I have to run the fans on everything at high RPM to keep things just within temp limits. I know over clocking produces heat, but things are much hotter even at stock settings. An open case makes 2-3 degrees difference but not much more. I've even had the case open with a pedestal fan blowing straight into the open chassis. It's winter here at the moment so I hate to think what it will be like come summer.
Edited by kesawi - 7/22/12 at 8:02am

what kind of voltages are you running through that 3770k ? whats your cpu temps ?

I'm currently running a 45 cpu multiplier with +0.005 DVID offset. Temps when running Prime 95 blend peak in the high 80s mid 90s when the test is doing a small FFT cycle. I've tried adjusting the CPU PLL voltage up and down, which hasn;'t really changed the temps. Cpu voltage peaks at 1.296volts.

yeah thats pretty hot for the amount of voltage youre using.
stupid questions first:
are you sure both fans are pushing air through the heatsink in the same direction ? are they both powered/plugged in ?
are you sure your heatsink is totally tightened down ?

good question here is, did you check to make sure the bottom of the heatsink is truly flat ?
how does the tim look on both the cpu and heatsink when you pulled it off after your best mount ?

finally, what are your ambients ? i know its winter down there. do you like being toasty warm ?

i know ib runs hotter than a sb but at 1.3v and that mega, you should be nowhere near that temp.

after establishing max stable OC in SLI setup..is it best to test it every few month to ensure it's still stable? (dust...internal TIM losing effectiveness over time..?)

How often should one be cleaning the GPU fans?

What about swapping the top card with the bottom every now and then just to ensure over the long term they both get the same amount of "heat" and "fan usage"? (since top card always 2-3C higher under load). This is when both cards run at the same frequencies (both GPU/mem)

I've visually verified that both fans power up and spin. I've also tried using only a single fan and that caused the temps to rise by an additional 3-4 degrees so this means they were both pushing in the right direction. I've also verfied the direction of flow by using a small piece of paper and observing which way it blows.

Mounting screws are tightened with a screw driver and are down to the end of the threads so they can't be tightened any further.

I've been applying a single rice grain sized amount of TIM to the centre of the CPU and have used just enough so that it spreads in a circle to within ~1mm of the edge of the CPU's IHS. When I've removed the heatsink the TIM is thinnest at the middle and thickest at the extremities. I suspect the bottom of the heatsink is convex based on these observations, which from the research I've done is how the Megahalems is machined. I'll grab a straight edge and check the curvature next time I remove the heatsink.

Ambient temp based on my freezer thermometer has been around 23C dropping to 15C by 2am when I've been messing around with it all night.

Based on my reasearch with the megahalems I would have expected a maximum 30-40 degree increase over ambient temps. Core 0 is consistently 12-15C below the other cores, but that is a common issue from what I've read in various posts. There is a 15-20C difference between the temps reported by EasyTune6 and CoreTemp (ET6 is cooler). RealTemp won't run due to a drive issue.

The only thing I haven't tried is a different TIM, but for test results I've found the stock TIM supplied with the Megahalems is meant to be the one of the best. Could have a dud batch of TIM.

Apologies for discussing CPU temps in a GPU thread.

This doesn't explain why the GTX 670 is running hot though.

Guys ... please take the CPU temps discussion to a new thread, preferably in the Intel CPU section.

Thanks