Safe temperatures for a 533 Celeron?

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Tim_K
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Safe temperatures for a 533 Celeron?

Post by Tim_K »

I have dual 533 Celerons running at 100% load in my BP6 right now, even though it's only using one CPU. The unused one is at 29 C and the one with 100% load is at 33 C.

How high can 533's be run safely for temps?
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Post by hugoc »

Until they become unstable. :) Seriously though, when my system was sitting next to a heat vent the CPUs got up to 45C under load and there wasn't any problem. I've heard of CPUs having shorter lives due to heat but I think that's a crock. In my experience, within the realistic useable life of the equipment only things with moving parts fail. I have an Amiga 500 and an Amstrad PC1512 (an 8086 system) that still work.
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purrkur
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Re: Safe temperatures for a 533 Celeron?

Post by purrkur »

Tim_K wrote:How high can 533's be run safely for temps?
A lot higher than what you are seeing. I had my 533's working hard with horrible coolers and they were running over 45 degree C.

I think that these Celerons are specificed from Intel at 65 Degrees (although I can't really remember, you can look it up in their documentation). Just remember that you are measuring the heat of the CPU from below the CPU and not inside so 30C there means probably 40C inside (just a guess though).
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Post by davd_bob »

I have my high temp alarm set for 55. I never get that hot. I checked and Intel says 70deg is the max on 466-533s. 85deg for 433 and slower.
Jeez, you could fry an egg on those temps.
Thats 70C which is about 150F.

33 is GREAT.

I pulled a drive with MS Win2000 Pro from a uni-cpu system and it didn't see the 2nd processor. After reinstalling Win2000 both processors showed up. There is a way to tell Windows you have 2 CPUs but it escapes me at this moment.
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Post by davd_bob »

opps, I forgot to add the link to Intel CPU temps.
http://support.intel.com/support/proces ... 007436.htm
There are *almost* no bad BP6s. There are mostly bad caps.

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Post by hyperspace »

davd_bob wrote: ...and it didn't see the 2nd processor. After reinstalling Win2000 both processors showed up. There is a way to tell Windows you have 2 CPUs but it escapes me at this moment.
Type-in msinfo32 from the Run dialogue box.
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Post by hyperspace »

Code: Select all

| Processor | Stepping |   Maximum   | Maximum Recommended | Maximum Power |
| Frequency |          | Temperature |  Inlet Temperature  |               |
|  (Mhz)    |          |  (Celcius)  |    (Celcius)(1)     |    (Watts)    |

    600          cB0 	    90°(3) 	         45° 	            12.6
    566  	     cB0 	    90°(3) 	         45° 	            17.9
    533  	     mB0 	    70°(2) 	         45° 	            11.9
    500          mB0 	    70°(2) 	         48° 	            27.2
    466  	     mB0 	    70°(2) 	         49° 	            25.7
    433  	     mB0 	    85°(2) 	         61° 	            24.1
    400  	     mB0 	    85°(2) 	         63° 	            22.5
    366  	     mB0 	    85°(2) 	         64° 	            21.5
    333  	     mB0 	    85°(2) 	         66° 	            19.5
    300A         mB0 	    85°(2) 	         68° 	            17.7
Notes:

(1) Maximum recommended fan inlet temperature is measured at 0.3 inches above the center of the fan inlet area (the fan center has a circular hologram). This is an ambient air specification.

(2) Maximum recommended Tcase

(3) Maximum recommended Tjunction
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Post by davd_bob »

show off
btw, I like your new sig
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Post by Wolfram »

hyperspace, I wonder why processors with the same stepping should have a different maximum temperature. It's the same core only clocked to different speeds, right? So might these numbers mean that the cpus will only operate correctly at a given clock speed until that temperature is exceeded?
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Post by hyperspace »

davd_bob wrote:show off
btw, I like your new sig
I thought the link was great information for all BP6ers. So I got a little crazy. Man, the layout was a bitch! :biglaugh:

That is a Quantum GyroScope. :coolman:
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Post by hyperspace »

Wolfram wrote:hyperspace, I wonder why processors with the same stepping should have a different maximum temperature. It's the same core only clocked to different speeds, right? So might these numbers mean that the cpus will only operate correctly at a given clock speed until that temperature is exceeded?
That may be. I'm not sure. :?
Last edited by hyperspace on Fri Jan 21, 2005 7:17 am, edited 1 time in total.
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Post by wickie »

When i tried different voltages during overclocking i figured out this:

C433 at 1.75 V and FSB 80 was running stable at temperatures below 35°C
reaching 40°C the system stopped working.

Tried 1.75 V and FSB 66 it worked fine up to 50°C

When i increased the voltage to 1.85 V at FSB 80 the CPU's could handle 70°C (but i did this test only for a short time!)

By default i try to keep the CPU temp between 30 and 40°C using the fan control of BP6FSB (8cm fresh air fans blowing directly on the CPU-heatsinks - maximum throttle 50% - on idle 25% to keep case temp low - a noise issue)

Transistors work faster when they are cooler - so higher clockrates are possible.
They also work faster when the voltage is increased, but they are getting hotter.
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Post by davd_bob »

How on Earth did you get up to 70deg?
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Post by wickie »

CPU fans off (standard heat sinks), Sisoft Sandra burn in test (CPU arithmetic & CPU multi media) for ~ 10 min. at 100% load

Now i have adapted bigger Athlon heat sinks, they can handle passive cooling when not overclocked and with a additional case fan, but i have set the CPU fans to min 25% throttle to keep the system temp below 45 °C.
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Post by Wolfram »

wickie wrote:CPU fans off (standard heat sinks), Sisoft Sandra burn in test (CPU arithmetic & CPU multi media) for ~ 10 min. at 100% load

Now i have adapted bigger Athlon heat sinks, they can handle passive cooling when not overclocked and with a additional case fan, but i have set the CPU fans to min 25% throttle to keep the system temp below 45 °C.
What type of Athlon heatsinks? Would be interesting because most current types are too large for the BP6.
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Post by purrkur »

Wolfram wrote:What type of Athlon heatsinks? Would be interesting because most current types are too large for the BP6.
Wolfram, see my post here on Athlon coolers I use that work fine with the BP6. They are a tight fit but they do fit :) The great thing about them is that the heatsink is built to run with 80x80mm fans. If the ones on there are too loud then replace them! Not bad and they are very cheap!
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Post by Wolfram »

Very nice. Thanks for the info!
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Post by wickie »

Yes - most standard Athlon coolers are to big, some milling had to be done.
But they were extremely cheap (3 € each) so it was worth doing it.

@purrkur: really nice (haven't read that thread before)
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Post by phaedrus »

davd_bob wrote:How on Earth did you get up to 70deg?
For everyone state side, 70degC is 158degF, which is about the minimum temperature to which restaraunts are required to cook ground beef.

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Post by davd_bob »

phaedrus wrote:
davd_bob wrote:How on Earth did you get up to 70deg?
For everyone state side, 70degC is 158degF, which is about the minimum temperature to which restaraunts are required to cook ground beef.

Jeff
I had an AMD K6-III 400. I OC'ed it to 420 and used it to head my beadroom.
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