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Temps too high with SP-94...

R

RS3RS

[H]F Junkie
Joined
Dec 10, 2003
Messages
8,197
I had an aluminum heat sink that cooled worse than the stock retail intel hsf, it was keeping my CPU around 54 degrees idle. So I ordered a sp-94 off of newegg, and a Panaflo 92 MM ~55 CFM fan and installed it today. Booted it up, and my temps are .... 50 degrees C. A whole 4 degrees less than before.

I then took it apart, cleaned it off (both the HSF and the processor) with 91% rubbing alcohol, and used a different thermal paste (the old one was the one that came with the sp94, the one I am using now is a silver based thermal grease) and I'm now at 48 degrees C. That's a little higher than I was expecting.

Here's a look at my cooling setup:

SP-94 with 92 MM panaflo fan mounted
120 MM exaust fan in PSU
Two 80 MM rear exaust fans
One side 80 MM intake fan
2 front 80 MM intake fans

All fans are funning at full tilt 12 volts.

And yes, I removed the little plastic thing on the bottom of the heat sink...

At load, the temps hit around 58 degrees C.

The weird thing is, that even at full load, with 58 degrees reported CPU temp, the heat sink is cool to the touch . I do have an ABit board, (abit IS7-E with latest bios), so I'm guessing it reads a little hot... But how hot could it possibly read? Is there any way to find out how hot it REALLY is? Or is it possibly REALLY running at 58 degrees C with this kind of cooling?

This is a P4 2.66 B at stock settings, with stock voltages.

Thanks :)

Edit: And yeah, the heat sink is pointing in the right direction for the heat pipes to work according to the user manual.

Edit 2: I'm starting to think the sensor is buggy, because when it was at 58 C, the second I closed prime 95 it jumped down to 52 C. I mean, like, instantly. Nothing could possibly cool down that fast. Bleh... :rolleyes:
 
You want the heatsink to be hot, a cool heatsink means poor thermal transfer. How did you apply the thermal compound?
 
I squeezed a little in the center of the CPU, and spreaded it around with the edge of a peice of cardboard packaging that one of my fans came in. I put it on pretty thin, just enough to cover the whole heatsink.

Is this the proper way to apply thermal grease, or no?
 
Originally posted by RS3RS
I squeezed a little in the center of the CPU, and spreaded it around with the edge of a peice of cardboard packaging that one of my fans came in. I put it on pretty thin, just enough to cover the whole heatsink.

Is this the proper way to apply thermal grease, or no?
Click to expand...

You want something that won't leave crap in the paste afterwards. Plastic works great.

Might want to hook up your own temp probe to check the results.
 
Originally posted by kleptophobiac
You want something that won't leave crap in the paste afterwards. Plastic works great.

Might want to hook up your own temp probe to check the results.
Click to expand...

Alright, thanks, I'll take it apart and reapply the TIM with something plastic.

A temp probe sounds like it's probably exactly what I need. Not to sound like a noob, but how exactly does it work, and where do you get one? Does the sensor go between the CPU and the HSF?

Thanks
 
Well, I took it apart again, and scrubbed everything down with alcohol (91%), and instead of spreading it around I just put a glob in the middle of the CPU and let the HSF spread it out. My temps are now down to 46.5 idle, which is a little better than before. Still not where I'd like to be, though.

I've heared that many ABit temp sensors are about 10 degrees too high, could that just be the case here? If it's really 36.5 degrees, then I'm as happy as I could be. 46.5 idle is just a little too high for me though...
 
Well, I think I solved it. After looking around on A-Bit's forums, it seems that ABit's motherboards have a very odd way of calculating temps. They seem to try the hardest they can to keep you from figuring out what the real temp is, but I have decided that there is no way my CPU can really be this hot with this kind of cooling. Just for kicks I put on a vantec tornado running at full blast, and I got the same temps.

So yeah, I have a homosexual temp monitor. :rolleyes:
 
Originally posted by RS3RS
Well, I think I solved it. After looking around on A-Bit's forums, it seems that ABit's motherboards have a very odd way of calculating temps. They seem to try the hardest they can to keep you from figuring out what the real temp is, but I have decided that there is no way my CPU can really be this hot with this kind of cooling. Just for kicks I put on a vantec tornado running at full blast, and I got the same temps.

So yeah, I have a homosexual temp monitor. :rolleyes:
Click to expand...

rofl, then try a temp probe - you gotta buy a 5.25in drive cover thing, and it has a temp probe on a wire on the inside. im not sure how you would use it on intels, amds you just place it next to the open core....
 
my ic7 reports temps getting close to 70C when according to a probe only 59-60C
 
Abit's sensor only reads high in the BIOS, and it's not as drastic as 10 C difference, more like 3 - 5. In Windows, I have MBM5 installed and it reads the temps fine from the CPU diode. 40 idle, 49-50 load (like when playing games or priming), whereas in the BIOS, it's about 44 idle.

To the original poster. What kind of silver paste are you using? Arctic silver 5? Antec reference? You might be using some kind of paste that doesn't actually contain silver.

Also, for most thermal pastes, you have to apply a thin layer to the heatsink as well as the CPU. If you're using AS5, you just have to put a little on the center of the heatspreader and let the heatsink distribute it.

I'm using a Zalman CNPS-7000, and with the kind of cooling you have, you should be getting the same or better temps than I do (unless your room is incredibly hot). My ambient temp is about 70F right now.
 
what is your case temp?

Abit's sensor only reads high in the BIOS, and it's not as drastic as 10 C difference, more like 3 - 5. In Windows, I have MBM5 installed and it reads the temps fine from the CPU diode. 40 idle, 49-50 load (like when playing games or priming), whereas in the BIOS, it's about 44 idle.
Click to expand...

something is seriously wrong with that, cause MBM reads the sensor chip, it should be the EXACT same in bios and windows - if it isn't, then something is either off, or your not idleing (this is why MBM doesn't work with the uGuru mobos, because abit isn't releasing the channels or whatever that the sensor chip reports
 
Well, it seems I'm not the only one

http://forum.abit-usa.com/showthread.php?threadid=11496

And

http://forum.abit-usa.com/showthread.php?threadid=12325&pagenumber=1

Just for the record, room temp is 77 degrees F, case temp is 31 degrees C, PWM temp is 33.5 degrees C. MBM, ABit EQ and BIOS all report the same temps.

I'm using a more generic silver thermal grease at the moment, but I've used it in the past and it's been within a degree or two of artic silver. I also got around the same temps (a little higher) with the thermal paste included with the HSF...
 
With my 800a I had to take steel wool to the heat sink to get best results. Kinda a polish. The "91% rubbing alcohol" works good but you need something a little more harsh.

Use 00 and then 0000 on it. This should bring it to a near mirror finish. Tarnish it a poor thermal conductor. And since most modern thermal compunds are mostly silver (Artic SILVER) it will tarnish once your removed the heat sink.

If your careful you can use the 0000 steel wool on the heat spreader on your P4 chip. But do be careful.

Also make sure your tanshions are right. Make sure you're getting enough pressure on the cpu from the heat sink.
 
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