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Overclocking P-III 866

Posted on 2002-05-27
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Last Modified: 2013-11-10
Hi,
I was wondering about overclocking my PC and I have a few questions.

If I overclock my Pentium III 866 MHz to 1007 MHz and it only heats up about 4 or 5 degrees above when it is at 866 MHz will that still be bad for the chip and components.

What is the highest recommended speed I should overclock to?

Currently I have a Chassis fan and power fan at both sides of the case so I would hope that would keep the MB and components temperature down a bit.
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Question by:adam8
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jhance earned 50 total points
ID: 7036809
>>What is the highest recommended speed I should overclock to?

I believe there are two criteria:

1) Reliable system operation.
2) CPU environmental limits.

Obviously, no amount of overclocking is useful if the system becomes unreliable.  So the first test is whether or not the system runs reliably at the speed you have it set for.  Once you're convinced that the system is stable, proceed.

Secondly, you don't want to overstress your CPU by operating it outside the maximum limits, especially TEMPERATURE.  A P3 chip is rated by Intel to 70C.  In most cases you will get nowhere close to this.  I suspect that your 5 degree temperature rise is from something like 35C to perhaps 40C.  (It would help if you specified the ABSOLUTE temperature and not just the rise.)  If so, or even if it's from 55C to 60C, you're still in great shape and nowhere near the maximum rating.  

Contrary to what many "so-called" experts might say, the operation and reliability of a CPU is GUARANTEED by the manufacturer up to the ABSOLUTE MAXIMUM ratings.  So in the case of a P3 CPU, it is designed to run at 70C, 24x7 if necessary with no loss of performance or reliability.
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by:1175089
ID: 7036831
4,5 deg above is not so big, but how much is processor working temperature - (42-48 deg C is normal for PIII) lower ,higher ? What kind of overclocking do you use? /PIII is multiplier locked for example 866=133.3 MHz FSB x6.5 Multiplier, if you can reach 1007 MHz (155 MHz FSB x 6.5 Multiplier), your PCI bus frequency stays 38.7 MHz (33.3 MHz normal) and some other PCI devices may not working properly in this freq. So highest speed is this speed in which your PC works stable with FULL LOAD. /When you play Serious SAM for example, not when you browse the NET./
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by:pjknibbs
ID: 7037173
Agree with jhance--if it runs stable and doesn't overheat you're not likely to be causing any long-term problems. However, in order to run the PIII at that clock speed you must have an FSB set to 155MHz--this could be making your RAM, graphics card etc. run too hot, and you wouldn't know because you're not directly monitoring those temperatures!
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by:adam8
ID: 7037971
Well when I run a CPU test on Sisoft to loop 10 times the CPU reached about 52 degrees using my ASUS monitoring prog. When I used the Sisoft program it added compesation to the CPU temperature (about 3.5 degrees) but didn't say why so I assume that the CPU reached about 55 degrees when overclocked and normally runs a few degrees cooler.

Another thihng is the multiplier is locked so I changed the SYstem/Pci frequency, not the multiplier.

I also like I said have 2 fans in both ends of the case..
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by:jhance
ID: 7037973
Like I said, 55C is NOT A PROBLEM!!
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by:adam8
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What about my components. like pjknibbs mentioned should I be worried about them overheating?
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by:jhance
ID: 7038950
I've never seen memory overheat.  While it's possible that your video card may overheat, that is highly unlikely.

In any case, system stability will be your primary test.  If you're paranoid about this, get a temperature monitor with a remote probe and monitor your RAM and video card temps.

The CPU is the primary concern since it dissipates far more power than any other component.
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by:adam8
ID: 7038977
The CPU is probably my main concern. I am upgrading my video card soon enough. Geforce 2 MX 200's are just no good.
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by:adam8
ID: 7038981
One more question.

Why would Sisoft sandra add compensation to the CPU temperature when ASUS PC Probe doesn't. I don't really understand why software that came with the motherboard wouldn't properly calculate the temperature.
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by:jhance
ID: 7039101
what makes the difference?  Even the higher temp is well within normal limits.
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by:willinois
ID: 7039700
jhance,

I have seen memory (RAM) overheat.  64MB EDO SIMM sticks.  Overheats if on for 4 hours.  Works again once cooled.

-willinois
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by:jhance
ID: 7040635
Note that I didn't say "memory doesn't overheat."  I said, "I've never seen..." that happen.

I'll agree it's possible, but it's uncommon.  In fact, I've never even noted that RAM was WARM to the touch, much less HOT!!  

BTW, 70C, also the max operating temp for most memory devices is REALLY HOT!  If you touch it, you'll be burned.
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by:adam8
ID: 7040961
well it is SDRAM, PC133. Not EDO.
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by:adam8
ID: 7041162
pjknibbs,
You said. "...you're not likely to be causing any long-term
problems"

it doesn't sound too convincing.
Is there a maximum I should overclock it to or is 866 to 1007 not that much?
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by:pjknibbs
ID: 7041723
Bad phrasing--I have a tendency to weak prose, for which I can only apologise. Basically, if the thing doesn't blow up within the first five minutes of turning it on overclocked, it'll almost certainly run for as long as you keep the machine, unless you're still using the same PC ten years from now.
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by:adam8
ID: 7043661
866 to 1007 isn't too much is it
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