Prev: P4C800-E Promise PDC20378 Question
Next: Memory Question
From: ~misfit~ on 31 Jan 2008 07:58
Somewhere on teh intarweb "Paul" typed:
> GSV Three Minds in a Can wrote:
>> Bitstring <6ghnp3p7pup116oks9os30jn19s8nnvpph(a)4ax.com>, from the
>> wonderful person soinie(a)hhotmail.com said
>>> I'm running a Core 2 Quad 6600 2.4 ghz and the temp when idle is
>>> about 25C according to Asus PC Probe II, although I've seen it up
>>> to 34C with tasking. I want to moderately over clock this (P5E WS
>>> Pro) setup and would like to know what to look for in terms of temp
>>> increases and what might be considered a threshold temp. I'm using
>>> a Scythe Mini Ninja and Arctic Silver 5, and thanks to those who
>>> recommended an after-market heat sink.
>>
>> Heat is not going to be the problem - there is a thermal protection
>> mechanism on the die, iirc, and probably another on the motherboard,
>> and you are ~30 degrees the right side of a problem anyway. If the
>> CPU gets too hot it will throttle the clock back.
>>
>> If you (have to, or choose to) ramp the VCore up too far in pursuit
>> of extra GhZ then you may fry something .. but It'll be volts and not
>> degrees C that does the damage.
>>
>> Before you go overclocking though, try a PROPER stress test at your
>> current clock rate - Prime95 torture test (maybe 4 copies, one
>> pointed at each core - I don't think the current one knows about
>> loading more than one core at once).
>>
>> 34c is 'loafing' IMO, but then it's hard to really work 4 cores in
>> everyday use. This assumes it's being measured right - not always the
>> case with Asus Mobos (what's the case temperature registering at?
>> Heck, how cold is the room it is in??)
>>
>
> I would find a utility that uses the internal CPU temp sensor. I
> haven't tested these. They read out the digital temp sensor. Programs like
> Asus Probe would likely be reading the analog sensor (CPU diode +
> hardware monitor chip).
>
> Intel Thermal Analysis Tool (TAT) - this was not intended for public
> distribution, but is used by overclockers. There may be a later
> version, but I'm not going to search all over for it. This is just the
> first
> copy I found.
>
> http://www.techpowerup.com/downloads/392/.html
>
> This one does a similar measurement, and was not written by Intel.
>
> CoreTemp
> http://www.alcpu.com/CoreTemp/
>
> Both of those programs rely on knowledge of Tj_max. That is the
> maximum junction temperature before the processor starts to throttle. The
> reason the measurement programs need to know that constant, is the
> measurement mechanism has a "relative" and not an "absolute"
> temperature readout. In other words, if Tj_max is 85C and the measurement
> returns a value
> of zero, then the calculated temperature is 85C. If the value returned
> is two, then the calculated temperature is 83C. Something like that.
> So it is important to know the Tj_max of the processor types. A 65nm
> processor could have a different Tj_max than a 45nm processor. The
> various families, because they have different die sizes and quantities
> of cache, and different power dissipation numbers, will also have a
> different Tj_max. So the measurement tool needs a table of values, to
> compute an absolute value from the relative readout. When those
> two measurement programs give a wrong result, the theory is that
> the Tj_max value is wrong.
>
> Maybe Speedfan (almico.com) can read the digital temp sensor.
> The release notes here, says the capability to read it was
> added in version 4.32. Current release is 4.33.
>
> http://www.almico.com/speedfan.php
>
> So the issue with programs like that, is that they've been updated
> with the latest values of Tj_max.
>
> To load the CPU to 100%, this version of Prime95 will run on all
> four cores at once. To use this program, when it asks to "Join
> GIMPS ?" say No. Next, a custom dialog will appear. The maximum
> memory to be tested will be shown in the lower right hand
> corner. On my 1GB machine, it shows 767MB as the amount of memory
> to test. I edit this value, and select something smaller, like
> 200MB. By doing that, enough memory is left on the computer, so
> I can do other things while Prime95 runs. You can leave the other
> settings as is. When you are finished with that dialog, the program
> will launch a number of threads. For a Q6600, you should see four
> threads launched. And your processor should start to heat up. The
> program has a "stop" and "exit" option in the left-most menu,
> so when you're finished, you can use that menu to get rid of the
> program.
>
> http://www.mersenne.org/gimps/p95v255a.zip
> http://www.majorgeeks.com/Prime95_d4363.html (if mersenne is down,
> use this one)
> When I want to do an actual integrity test, and not just heat up
> the CPU, then I might set the memory to test back to the 767MB
> value, as then as much of the available memory is tested as
> is possible.
>
> Those are the tools I know about. Have fun :-)

Very useful post Paul. I have all of those applications/utilities installed
on my E4500 @ 3.3GHz. P5K-E WiFi with a Tt MiniTyphoon cooler.

The temp AsusProbe II reports for "CPU" varies with every BIOS update. IOW
it can't be relied on. I find CoreTemp is most useful, running all the time,
minimised to systray.

Cheers,
--
Shaun.


First  |  Prev  | 
Pages: 1 2
Prev: P4C800-E Promise PDC20378 Question
Next: Memory Question