critical temperature

[glass]

I have cel400 and overclocked to 450.
Temperature is about 42C(105F).
is that acceptable range? or too hot?

please give me some suggestions.
thanks for your help.

[Sterling_Aug]

The Intel spec. is 70°C as max. temp.

I run the RC5 client on my PII-450 overclocked to 527 MHz @ 2.1 volts and it is running 63°C right now. I have dual fans on a CPU cooler heatsink, a 4 inch 120 Volt AC fan blowing on the CPU and video card, the case is off, and a 20 inch box fan blowing inside the case. The computer is on 24/7 without any hickups due to temp. overheating.

[neo]

Good God, 63 degrees C? I would consider getting some additional cooling on that baby. For every 10 degrees increase the CPU life is cut about in half. That means that at 63-33=30, you have cut your processor life in (1/2)^3 = 1/8!! I use 33 as an estimate of the "normal" operating temp. in degrees C. I have a PII 400 O/Ced to 496MHZ running at about 37 degrees C (max), and I'm happy with this.

42 degrees C... is that running at MAX, 100% CPU usage? If it is that probably acceptable.

-neo

[800XL]

There has always seemed to be a lot of confusion on this subject. Intel puts specs of 70C and then you always see people claiming that anything over 30C is killing your CPU. I have witnessed first hand a PPGA Celeron 466 running at 129C without crashing, and I have seen similar CPUs fall out at 65C. Is it luck? Probably, but who can tell.

The specs Intel puts out assume that one is using their product at its rated speed, voltage, and withing a set environment. Anything outside of their specs and you can kiss any reliance on their numbers goodbye. Overclocked, a CPU will put out more heat, and be less tolerant of it. The more heat you pump out of it, the better, longer, and faster it will run. Well, until you start to approach abs 0 at least. (Ceramic packaging could become a bad thing... :P) I think my point is that specific numbers are very hard to judge. I have done more heatsink thermal measurements than I care to remember, and I know just how hard it is to get exact readings. My readout from a thermalcouple riding the top of the CPU slug vs your number from the internal thermal diode may give fairly different numbers, even if the temps of both chips are exactly the same. Just my pair of pennies.

For the record, I've got a Celeron 300a/BX6 2 @464Mhz & 2.0v. 43C running RC5 with a case temp of 36C.

[Nathan G.]

My 2 cents (overpriced)...105 is ok in "Run".
That 70 deg. C spec on Intels data sheet is a Maximum!! Systems should not runn at the Max listed temp. My system run at 35 deg.C in IDLE and around 46 deg. C while cpu is busy.
Note the PPGA have a higher max Temp listed on data sheet. If you can help it, dont dance around max temp ratings. I installed a Alpha heatsink which did drop the core by about 10 Deg, measured by thermal diode....(my sys. p2-300 @ 504)
On a side note: I have spents months making products pass FCC radiated noise limits. ( all consumer ITE equip should be class B) I bet these overclocked systems with no cover on are radiating like a mutha!! anyone had thier neighbor complain ,radio station go out, have a airplane land in front yard or magically turn on the blender when system boots?? hehe
Nathan G.



[This message has been edited by Nathan G. (edited 06-28-99).]

[Sterling_Aug]

Update:

Here it is now 9:30am and my CPU temp. is 61C and the case temp. with cover off is 37C.

I have a peltier on order and will try to see how much lower I can decrease my CPU temps.

I also have a Celery 300A o/c'd to 450 MHz @ 2.2 volts with an ALPHA, 2 fans on the ALPHA, a 4 inch 120 VAC fan blowing on the video card and CPU, and the case off. The case temp. is 33C right now.

[Andre]

My 450a (300) at 1.96v runs no more than 27c right now, sandwiched 2 fans on front, 1 on the back, case off and 1 80mm fan blowing down at it.
I´m happy! http://www.sysopt.com/forum/smile.gif

[Joel Kleppinger]

Sterling: Check out what I wrote here http://www.sysopt.com/forum/Forum7/HTML/000097.html about the BX6-2's temperature sensing. I do believe you have a board similar to mine that does not report accurate temperature readings.

[Gordon]

I have a Celeron 300A (SL32A), w/a standard retail fan/heatsink combo, o/c'd to 450 Mhz, set at the standard 2.0 volts. When running programs such as SETI@Home, my cpu temperature is around 39C (102F), with my m/b 27C (80F). I have a case fan, as well as, a HD cooling fan, blowing in; w/a slot fan, a fan behind my cpu, and power supply fan blowing out.

[SiONG]

Say....I was wondering, cause i'm in Singapore, which is near the equator, daily temp is about 30 ~ 33 C, PC is not in an "air-con-ed" room , Kinda worrying isnt it ?

Anyway my C433 (Not o/c) is @ approx. 41C while case @ 38C .

Tried to use Waterfall, CPU temp gone to case temp, couldnt go lower. *sigh*
But i noticed that the Vcore is not stable, chging betw. 1.98 to 2.05 (setpt : 2V)

Will it "harm" the CPU ????

[Sterling_Aug]

kec95: I have a PII-450, not at PIII-450.

The PII-450 will not run stable at default 2.0 volts, I have to run at 2.05 maybe 2.1 volts to keep it stable at 527 MHz. Heat is a problem even with an Alpha P60120SB, an 18 cfm fan, and a 65 cfm case fan mounted in the top of the case above the CPU exhausting out of the top. I plan on fabricating a stacked peltier sandwich this week and drop the CPU temps. into the 30°C range even while the RC5 client is running 100% CPU utilization. Turning off the RC5 client should drop the temps. into the sub -0°C range, but then, thats why I am runing the computer, to crack RC5 codes.

[gER0NIMo]

hey man sterling. if yer cpu runs that much cooler with yer case off then yer with yer case on yer not getting enough cool air into yer case. have you reversed the direction your p/s fan flows? added a extra fan or two? mebbe one blowing air out the back and one sucking in from the bottom. 60c+ is pretty dangerous. actually its just plain hot. a rule of thumb is if you cant touch it without burning yourself you got a problem.

[Sterling_Aug]

gER0NIMo: The 66°C+ temp. is for the CPU thermal diode reading. It is not the heatsink temp using the thermister. I do NOT have air conditioning in the house and it hit near 100°F here today. I have a 20+ cfm case fan blowing in (with extra big holes drilled into my case front), a 65 cfm fan blowing out the top thru a hole I cut in my case, and the power supply fan blowing out. My case temp. is still 45°C because it is so hot here. My Celeron 400A running 500 MHz @ 2.2 volts reads about 45°C CPU (with e peltier) and a case temp. of 33°C. I have 3 more peltiers on order so I can run stacked peltiers on both CPU's and drop the temps. into the 20's while running under full load.

[kec95]

My P3 450 O/Ced to 558 runs at 26C.
Sterling you should be able to run that P3 450@527 at default volts. Why 2.1??

Kenny C

Whats up 800XL.

[Mistr2]

My P3 450 @ 580 (2.1V) runs at 35C
52C max.