high Athlon XP temps, why?

[soulm4tter]

I have 2 Athlon XP 1.4GHz CPUs. I was very pleased with my first one. It runs fairly cool at 50C under load. This is while overclocked to 1558Mhz @1.85v. My new Athlon XP is currently running at 64C under full load. Its not overclocked and its running at default voltage. I'm getting these temps from MBM5 while running RC5. The BIOS suggests the same high temps and the heatsink is extremely hot to the touch. I used the same amount of ASII on both cpus, but they are using different coolers. I just wanted sum input on what you guys thought. Heres the specs

Cool system
Abit KR7A-133
Athlon XP 1.4@1.55
Alpha 8045 w/ 80mm low voltage sunon
120mm low voltage intake and exhaust

Hot system
MSI K7T Turbo2
Athlon XP 1.4
SK-6 w/ 80mm low voltage sunon
case is off
room temp is 72F

does the SK-6 jus suck with the Athlon XP or do you think i did sumthing wrong? The SK-6 is perfectly clean. I don't have any 60mm fans around to try or any higher output 80mm fans.

 

[Mikewarrior2]

Are they both stable?

It could just be different motherboard readings........



Mike

 

[FlowerMan]

You cannot compare apples and oranges (your two diff HSFs). Also, the temps are taken from the in-socket thermistor, which is not accurate. When switching CPUs you could have changed the orientation of the thermistor and thus resulted in higher temps. Different application of thermal compound, different ambient temps, different mobos with different hardware monitoring chips, etc...

There are so many reasons why your temps are different.

 

[lessell]

 

[lessell]

You may not be generating enough air flow with the fan on your sk6 with the larger fan you do have a rather large dead spot over the center of the heat sink, not sure what that fan is rated at as far as cfm but the the sk6 has to have high air flow to dissapate heat. I'm running one on my xp1700@1650 and it runs around 45C under load. I'm using the 38cfm delta and it does produce the standard delta whine. Try a 60mm fan if not a delta then at least a high capacity fan and see if you don't have better results.

 

[svidanag]

Why not switch the heatsinks, and see if your temps change? Different mobo's read temps differently due to the placement of the in-socket thermistor.

 

[Jhhnn]

I think lessell has it right- the sk6 needs a more powerful fan than the Alpha, for sure. I'd try a 60mm in the 27-30cfm range. Alphas are huge and relatively low restriction so low flow fans work well. SK6's are much smaller, and even though they're copper, they need a relatively high pressure/flow fan to overcome the resistance to flow from the narrow fin spacing.

 

[MoFunk]

I think one of the reasons the Alpha uses a slower fan more effectivly is because it is set to suck.

 

[FlowerMan]

True.

http://www.alphanovatech.com/c_pal8045e.html

Thermal resistance (Rsa)
PAL8045U <FAN : Expulsion> 0.28 deg C/W <----
PAL8045U <FAN : Induction> 0.32 deg C/W

I'm pretty damn sure the engineering that went into the PAL8045 is much more complicated and elaborate than the SK6 Copper/aluminum heatsinks are better than pure copper ones or pure aluminum ones.