CPU Temps & Heatsinks

[apye]

I have a XP1900+ @141fsb 1692Mhz, cpu cooling is a Coolermaster HCC002 with a 80mm papst 34cfm fan (original fan way too noisey) & AS3. My temps at the moment are: 49c idle & 53c load(using Asus probe), are these temps ok or do I need extra cooling.
I am thinking of getting the Thermalright AX-7 but, as it is a bit expensive, would like to know if I will get much improvment & if it will fit in a Asus A7V333 mb.

[The Pimp]

Is the system stable at those temps? If so , then I wouldn't worry about it. Heat can cause instabilities, yet the values you have given are well within acceptable values IMO, especially as you have overclocked the CPU as well.

What cooling do you have in your case? Is the PSU a dual fan version or single fan? How big is the case? Does any of the cabling look as it could be restricting airflow? Are the case fans blowing in the right direction (i.e. rear fans taking air out of the case & front bringing air in)?

[MoodyB]

Isn't it the Asus m/board that reports temps higher than they actually are?Mabey someone can else clarify this?

[The Pimp]

Yes Asus boards do report slightly higher temps than they really are, as do most boards.

[apye]

Originally posted by Darren Wilson:
<STRONG>
What cooling do you have in your case? Is the PSU a dual fan version or single fan? How big is the case? Does any of the cabling look as it could be restricting airflow? Are the case fans blowing in the right direction (i.e. rear fans taking air out of the case & front bringing air in)?</STRONG>

To answer your questions:
The PSU has a single fan, I have the normal ribbon cabling, do the round ones make any difference?. I have one exhaust case fan at the rear, I tried a fan at the front, sucking in, but didn,t seem to make much difference as there is no grill on the front plastic cover! so I took it out again.
I would really like some advice on the Thermalright AX-7 heatsink, could this make all the difference. Thanks for your help so far.

[Mr_Nemesis]

Originally posted by Darren Wilson:
<STRONG>Yes Asus boards do report slightly higher temps than they really are, as do most boards.</STRONG>

I'd heard that this was due to the way mobo's measured Athlons CPU temp... Pentiums have their own temperature diode on board, whilst the Athlons rely on a motherboard mounted temperature diode, which (since it's not part of the CPU itself) reports a lower temp, so the mobo is programmed to add a fixed number to it in order to make this temp nearer the actual value, often erring on caution and adding a bit more than is neccesary.

Blimey, I hope that made sense to someone other than me.

I've not found any links on it though... can anyone confirm if this is corect or not?

[Kynoch]

This is correct, the thermistor located in the zif socket touches the underside of the core, because the thermistor is in the middle of the socket and only touches the outside of the core, unreliable temps are made, this is corrected using resistors which are built into the thermistor circuit, and not software!

[The Pimp]

Palomino & Thoroughbred core Athlon's have the internal temperature diode, but it is a shame that only a handful of boards support this function at present :( I think though that if people were to start taking readings from the internal diode of an Athlon they wouldn't boot their system up as they would think that their CPU's were about to catch fire :eek: :eek: :eek:

The trouble with mobo mounted thermistor diodes is that they take the temp from the wrong part of the CPU!! The hottest part is obviously going to be the actual core itself which is on top of the chip, yet the thermistor diodes take the temp from underneath!!!! The majority of the time the thermistor is really only detecting the temperature of the air underneath the CPU due to most boards have the diode bent slightly back, so it doesn't actually make contact with the base of the CPU. Because the air underneath the CPU is basically 'stagnant', the temperatures displayed tend to be higher than what they really should be. This is why the older thermistor probes that actually touched the core of the CPU's (remember the type used on Slot 1 boards with SECC-2 CPU's?) are actually more acurate than the under-cpu ones.

[ 26 June 2002: Message edited by: Darren Wilson ]

[MoodyB]

I recently had an email from AMD explaining the XP temps.I started using WCPRSet to lower the idle temp of my XP1900 from 43c to 29c(still remained at 48c under load).As I was a bit concerned that the 17c jump might cause some stress,I mailed AMD about it.They said that it shouldn't cause any problems,
and also explained that if you're using a m/board that has a temp sensor in the cpu socket,then you should read your XP's
maximum temp as being 70c(instead of 90c),
since these socket temp sensors normally report temps 15-20c lower than what they actually are!

Hope this makes sense :)

BTW I had to remove WCPRSet as Wolfenstein multiplayer wouldn't run with it enabled :(

[apye]

Hi guys back again after buying me a AX-7, but think something maybe wrong!.

B4 was getting temps of 49c idle & 53c load.

Now with the AX-7 i'm getting 47c idle & 51c load.

I have seen temps better than these with the AX-7 with not such a good fan( I have a papst 34cfm 26dba).

My mb temp is down at 27c & I have also seen cpu temps posted as 3c above case temp with this heatsink.

Have I done something wrong or do these temps sound right. How do others get such low temps?

Many thanks for any comments.

:confused: :confused:

[apye]

I was thinking what might be causing my high temps.

I have 2 case fans, one sucking in at the bottom front & one exhaust at the rear near cpu. I also have a fan on the heatsink, they are all 80mm fans & all run off the PSU. i have looked up my case (Enlight 2730) & noticed it only has a 300w psu fitted with a single fan.

Could this be a problem.

Cheers
:confused: :confused:

[Kynoch]

The 300w PSU can handle loads of fans, so this wont be causing your problem, and having one exhaus and one intake fan should be better than just the one that was fitted with the case.