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Reading QX6700 core temps on phase?

post #1 of 15
Thread Starter 
Has anybody here found a way to read the sub zero core temp of a QX6700 on a P5B Deluxe under phase cooling? The bios (0804) is apperently borked when you get below 0, and reads -4c no matter what, load or no load, never changes. Probe reads 252c, Speedfan reads -4c...they both obviously key off of the bogus bios reading. Coretemp and TAT don't seem to work right either. I thumped around on xtremesystems for a bit and nobody there had an answer.
LS evap temp is -32c, but so far I have not been able to read the actual core temps.
Anybody find a way to do it?
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post #2 of 15
i'm pretty sure that with phase, you don't have to worry about the core temp. just the evap head temp.
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post #3 of 15
Yeah who cares what the CPU temp is. It shouldn't go over the Maximum Load temperature of the CPU. The CPU will get to its maximum overclock under phase before it even comes close to overheating.
    
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post #4 of 15
Thread Starter 
Quote:
Originally Posted by cgrado View Post
i'm pretty sure that with phase, you don't have to worry about the core temp. just the evap head temp.
I wouldn't agree with that. How else could you evaluate proper seating of the evap to the cpu....Or the effect of trying a different heatsink compound....Or the effect of lapping the cpu....Or check if the 2 die temps are balanced....if you cannot read the actual core temps to determine the temperature differential between the evap and the core?
Otherwise you are just taking it on faith that if the evap is at -32c, the core temps MUST be OK. I'm not so sure.
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post #5 of 15
Thread Starter 
Quote:
Originally Posted by J o h n R o g e r s View Post
Yeah who cares what the CPU temp is. It shouldn't go over the Maximum Load temperature of the CPU. The CPU will get to its maximum overclock under phase before it even comes close to overheating.
And your explanation basically is telling me that with the evap at -32c, my OC wouldn't be any better if my cpu was running at 0c with a poor heat transfer to the evap or if it was running at -20c with a good heat transfer to the evap. Just as long as it doesn't burn up? I am new to phase, but I don't buy that either. There has to be an advantage to getting the core temp as close as possible to the evap temp. Or can a veteran phaser tell me that I am barking up the wrong tree here?
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post #6 of 15
i think what he's asking for you guys it to stop giving short anwsers that just came up off your head, and actually do some research
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post #7 of 15
Thread Starter 
Quote:
Originally Posted by <CRACK@> (CS:S King) View Post
i think what he's asking for you guys it to stop giving short anwsers that just came up off your head, and actually do some research
What I am hoping for is...
A. By using this phase change forum I am tapping into some of you guys that have been doing this for a while. This is my 1st foray into phase cooling with a stock LS.
B. Somebody has found a bios fix/program/whatever that allows accurately reading my core temps.
C. If I am wrong in some of the basic assumptions I have put forth in my last 2 posts (based on what I have seen using heavy duty air cooling) about temp differentials between the cooler and the cpu, someone here has more experience and has some real answers.

I don't mean to insult anybody, I am presenting the logic behind my thoughts, and If I am wrong, I am here to learn,
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post #8 of 15
Although I cannot advise you on how to actually monitor the temperature of the dies on the Kentsfield, the LS is a very stable unit in terms of delivering cooling, therefore the best mount/thermal paste/effect of lapping will occur when the evaporator head is at the highest temperature after running for a while. That is, if the evap head reads -45C, the core will most certainly be at lower temperature when the evap head reads -35C (Given the two temperature were taken at equal load levels and at equal ambient conditions.) This is because there is more heat transfer between the dies and the evap head, leading to lower core temperatures, but higher evap temps. Also, keep in mind that the core will be a higher temperature than the evap head, always. (Common sense, yes, but just for the record.)

You can calculate the temperature of the core if you can obtain the exact thermal heat dissipated by the Kentsfeild, the exact amount of heat your LS can remove at peak Operation, the lowest possible temperature your LS can achieve without load, and so forth. However, the Guys at XS will probably be better t this than I am. I can do the math for the thermal calculations, but my knowledge of the evaporation system in the LS runs only so deep.

BTW, good choice with going with the LS. The Mach II GT would probably not do as well, considering the LS is capable of removing much more heat in watts, albeit at a higher temperature than the GT.

Best of luck,
Sun
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post #9 of 15
check the XS forums

I believe there is a thread about this
    
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post #10 of 15
"Now, according to the ITE Temperature reader which is read by overclocking software when the system is in Windows, the processor was running (incorrectly) at 240°C! The program doesn't know how to register negative temperatures and once you go below zero it starts at 255 and counts downwards. What we were really looking at was a loaded temp of somewhere around -15°C." - pcstats.com

here you go found it lol hope this helped
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