Weather is warming up, and so is my system

GnomeCop

Diamond Member
Jun 17, 2002
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I know that the p4 3.06 ghz cpu is one of the hottest cpus ever, but damn, my system idles at 47C and under load... welll the highest I've ever allowed it to go to was 63c.

That can't be normal. I'm perplexed.
I have 2 NMB 80mm fans as intake and 2 NMB fans as exhaust (1 in the power supply)

Also I have a swiftech p4 heatsink with a 92mm papst fan on it.

One would think this is enough, but add on the warm weather and it starts to get alarming.

Any ideas out there on cooling this?
I swear if I can't get this thing cooled, I may start selling it off piece by piece and just use my notebook all summer :p
 

lavaman

Member
Mar 3, 2004
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I was thinking that maybe that motherboard doesn't report temps correctly, but I don't know if that's the case with that particular motherboard.
 

PCHPlayer

Golden Member
Oct 9, 2001
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Can you give us all of the temps: room/case/CPU. That way we can see where the problem may be. A well cooled case should be able to stay within 6 C of room and a good CPU cooler should be able to keep the CPU within 10 C of the case. Of course all of this depends on the method your motherboard uses to measure the CPU temp.
 

psiu

Golden Member
Oct 1, 2003
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Along with all those temps, the fan is blowing onto the heatsink, right?
 

GnomeCop

Diamond Member
Jun 17, 2002
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yeah the 92mm papst fan is blowing onto the heatsink and not sucking air off of it.

You are actually right on about the ~10c above case temp. I think for awhile Imy case temp was around 40c. I don't know exactly how hot the room temp was on Sunday.
This week is shaping up to be fairly hot in Southern California, so I hope I can get this all sorted out this week.

it was fairly warm in my room during the day but I noticed the 47c idle temp when it was around 10pm at night when it was considerably cooler.

at this point I am thinking that thereare intake problems that may be responsable for temps being so high
 

Drizzy

Golden Member
Dec 12, 2003
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I wish I had some info for you but I will be watching this post closely cause my system is running unusually hot as of yesterday as well. vcore is around 45-46 w/low load and 56-57 heavy load. My system temp is around 33. I am running an athlon 2400+ on an nf7-s mobo. OC'ed quite a bit to 2.4 ghz but still it was running about 5 degrees cooler until yesterday. :/
 

GnomeCop

Diamond Member
Jun 17, 2002
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drizzy , when was the last time you checked for dust :p ?
If it was running cooler up until a certain moment, it could be dust build up/ fan dying, etc.

My system however was completely recabled in a new case with a new heatsink, so I am puzzled.
Hopefully I can re arrange some more cables to improve intake.
My next move would probably be to get a PSU with a 120mm fan on the bottom to exhaust more hot air near the CPU.
 

Drizzy

Golden Member
Dec 12, 2003
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Well the whole system is about 2 weeks old. If I already have a dust problem then there is some serious issues! :)
 

GnomeCop

Diamond Member
Jun 17, 2002
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oh ok you are in the same boat as me, new/clean system, unnaturally high temps.
 

RalfHutter

Diamond Member
Dec 29, 2000
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The LL 6070 has notoriously bad ventilation, especially around the intake area. You're also running a lot of HDDs and a hot vidcard which all contribute heat to the case. Your 4 NMB fans, while nice and quiet, don't move a lot of air either. So that gives you pretty high case temps to start with which leads to problems with your CPU cooling.

The MCX478-V, while a good performing heatsink, isn't at it's best with a low-flow fan like that Papst.

The 875PBZ reports temps fairly accurately.

It's been warm here in Cali the past few day. My computer room has been in the high 80°F range during the late afternoon/evening hours so I'll assume your in a similar position since you're located about 10 miles from me.

So, the bottom line:

Your CPU temps under load and at idle are right about where they should be, given your hardware setup and ambient temps.

Can you do anything about it and still keep your system quiet? (which seems to be your aim, given your choice of hardware and your excellent cablegami job)

1) More case ventilation would certainly help. That would mean cutting all your fan grills at the absolute minimum, and preferably doing some further mods the the front bezel are of that 6070.

2) You might want to think about swapping out the rear NMB's for Panaflo L1A's on Zalman Fanmates. The L1A's move more air than the NMB's and are about the same, or very slightly louder. Using the fanmates you can tune them if necessary.

3) You could consider swapping your HSF for a Zalman 7000. They perform much better than the MCX478 under low airflow conditions. (look at the temp comparison charts on the last page of that review I linked above)

The thing is, if you do all the above you'll end up with a CPU that still runs in the high 50°C area under full load, which is 100% perfectly safe and won't hurt the CPU at all, but still seems to concern people that are used to seeing lower temps. These 3+ GHz CPUs put out a lot of heat and it's tough to get rid of it unless you want to run a lot of fans/ventilation, which it looks like you don't want to do. I can empathize with you, being a quiet PC nut myself. My nearly silent gaming rig is built around a 3.0C P4 and runs in the high 50°C range duing the hot summer/fall even though it's in a very well ventilated case.

My suggestion is to make a few mods to your case ventilation/airflow and then just run your system like that. You have a very nice system and it seems a shame to pull it apart just because the CPU temp runs warm in hot weather under full load.
 

GnomeCop

Diamond Member
Jun 17, 2002
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thanks for the tips, I think I may replace the fans, I have a zalman 7000CU in an slower, older system and I may swap the heatsinks.

Next thing is probably going to have to do with some changing of hard drive positions in the case, if I can keep it under 60c/load on a warm day, I'll be fine with that
 

Sid59

Lifer
Sep 2, 2002
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yesteday my room was about 80F .. my cpu hit 52F idle when i got home - Barton 2.2GHz
 

GnomeCop

Diamond Member
Jun 17, 2002
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Originally posted by: OpTiX
try TEC cooling

That actually crossed my mind, but I've spent enough on this money pit already :p

I hooked up my Zalman CNPS7000-Cu from another system, cleaned up some more cables, re positioned some HDs, and made sure the Zalman fan speed was turned to max.

Amazingly my temps under load hover around 55c on a hot day, and it idles around 40-45c.
At night or when its cooler, it idles around 35c and under load at 45-50c.

The lian Li pc6070, while having some of the crappiest intake I've ever seen, keeps the system very quiet even with the zalman 7000cu is on max speed.

when the weather is cooler I can turn it down and have a nearly silent system.
 

GnomeCop

Diamond Member
Jun 17, 2002
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Also, if anyone happens to know... whats the shortest SATA cable one can buy?
these 18" ones are a little too long
 

GnomeCop

Diamond Member
Jun 17, 2002
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well I got my system down to about low 30's idle temp, but thsi is really weird because the temp will almost double when I am gaming. pretty big difference there.

Anyone know where I can get a lian li side panel with a pre made duct/blowhole?
 

NokiaDude

Diamond Member
Oct 13, 2002
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How much thermal grease did you apply? More than a paper thin layer and you put tooooooo much!! You only need enough to fill in the microscopic pits and cracks.