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Does this overclock look good so far? - Page 2

post #11 of 19
Thread Starter 
my TJMax is set to 98C as well. You saying I should lower that to 90C?

I don't understand the difference that would make if it never goes near that anyway?

That's not meant to sound rude btw it's an honest question.
post #12 of 19
I don't know exactly how RealTemp works, but the TJMax number affects the calculation of the core temperatures. You can read more about at their Installation and Calibration page.

When I had it set at 98C it was giving me idle temperatures that were way low, much lower than ambient room temperature. After some net reading I found a few references suggesting 90C was more the norm for 2500K, so that is what I am using. With TJMax set at 90C my idle temps are about 2-3C higher than ambient, and about 4C higher than ASUS AI suite was reporting.
post #13 of 19
Thread Starter 
Well either your or my real temp is bugged because check this out..

338

When I set my max at 90C my temps actually lowered..
post #14 of 19
Quote:
Originally Posted by Hexa View Post

Well either your or my real temp is bugged because check this out..
338
When I set my max at 90C my temps actually lowered..

:thinking.gif: looks like it got up to 68c to me...
 
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post #15 of 19
Quote:
Originally Posted by PhilC2001 View Post

Hexa, I'm going through a similar exercise at the moment, and was wondering what your TJMax is set to in RealTemp? It seems the default setting is 98C but on my 2500k that was telling me idle temps were ~10C lower than ambient temps in my room. I don't think that is possible. Based on my reading around the net and trial & error I have lowered the TJMax value to 90C, and that seems to be more accurate.
With ambient in my room at 26.7C, my PC has been running Prime95 for nearly 6 hours now, with frequency at 47X 100MHz (4700 in CPU-Z), and the CPU temps seem to be peaking around 66C. Although I was hoping to keep around 60C, I have had to up voltage a few times to keep it stable, otherwise Prime95 was throwing Rounding Errors. Just to be on the safe side, I have set a thermal alarm in RealTemp at 72C, so if this temperature is reached it will shut the system down. There are instructions on the RealTemp web site for how to do this.
Why 72C? Because Intel states the TCase limit for the 2500K is 72.6C Intel-Core-i5-2500K-Processor-reference page.
I don't exactly know what TCase represents, I assume thermocouple temps taken at the outer case of the CPU, which likely means internal core temperature may be 10+C higher. There is a lot of different opinions on this, but I prefer to err on the safe side, so I'm aiming for lowest thermal load as I OC my PC. It would seem 4.7GHz is as far as my setup will go at safe temps, assuming it runs overnight tonight and doesn't reach the thermal alarm I have set.

You can read about Tcase here

In short, Tcase Max and Thermal Specification: Can be found on the Intel Processor Spec Finder. This is often confused by users as the maximum temperature for the cores, but in actual fact it refers to the maximum temperature that should be reached by the Tcase sensor. This specification is rounded to a relatively precise 0.1 C.

This is not the maximum temp your CPU can operate at. The maximum temp for Sandy Bridge chips is 95C, this is when the chip will start throttling back to save itself. I try to keep mine below 80C, but thats just personal preference. I know others who operate their Sandys at or above 80C every day with no ill effects. At 72C your fine.
   
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post #16 of 19
Thread Starter 
Quote:
Originally Posted by Schmuckley View Post

:thinking.gif: looks like it got up to 68c to me...

That 68c was from right before when I had ran a 3d mark 11 benchmark.

If you look at my second screen shot on the first page you will see my minumums were actually higher when the max was set at 98c as opposed to my minimums on the latest screen shot with a max of 90c.

That's what I was referring to.
post #17 of 19
Well my temps will peak at 71*, but I see you are using the H80, which seems to be a bit better than my CM 212+. I am also running hyperthread with the i7, which from my readings and testing, gives up another 10*. One thing for sure is the Prime95 is the worst case scenario and mine never gets that high during normal computing and gaming and even when running the 3DMark and other benchmark tests, so I am quite comfortable with the clock. I still go back and forth with going with either the H80 or H100 or one of the Thermalright offerings, but then I'd have to remove the mother board to install the back plate - the 932 partially covers the CM backplate. I fear going through all that I gaming a marginal improvement. For now, I will just sit back, enjoy the fruits of my labor and have some fun.

Al
Edited by Methodical - 2/21/12 at 7:26pm
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post #18 of 19
Quote:
Originally Posted by Hexa View Post

Well either your or my real temp is bugged because check this out..
338
When I set my max at 90C my temps actually lowered..

Sorry, my mistake, temps do go down when you lower TJMax. I had a few different values as I was testing and got a little confused with ups/downs.
In my testing I found using TJMax at 90C is much more accurate than 98C. There are various discussion about this on the net, and I found some amount of consensus on using 90C, but you may need to experiment and do a little further research on this if you feel uncomfortable with the setting. Perhaps if you have other temp utilities you may want to cross reference and adjust based on your observations.
post #19 of 19
Thread Starter 
I'm j/w now whether or not I want to try for 5ghz!
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