Overclocking : High CPU/mobo temp ??

[shchong2]

Hi,

I'm new to OC.
Currently I'm trying to OC my P4 2.4G CPU.
At certain freq, the system becomes unstable.
I believe that the limiting factor could be due to the CPU temp.

Currently I'm using CPU fan with "Aluminium" heatsink.
Ok, I know I should have use a "Copper" heatsink ......

I would like to know from your experiences that:-
(1) At what temp (degree C) should we consider HIGH TEMP for CPU ?
(2) At what temp (degree C) should we consider HIGH TEMP for MotherBoard ?

Thanks in advance. 🙂

 

[ChampionAtTufshop]

retail heatsink you mean?

id say anything under 55-60C under full load (worse case scenario, meaning you live somewhere very hot lol) for cpu
and motherboard maybe 40C and under should be fine (although its a bit hot at 40C...)

when you bump the frequency and it is becoming unstable, are you bumping the Vcore (core voltage as well?) **just make sure not to go above 1.7v reported in windows**

also did you lock down pci/agp bus?

maybe you need to supply more voltage to the ram (Vdimm)

also relax cas/ras/all those other ram settings, make them the biggest number available and go from there
also set it to a 1:1 ratio (cpu:ram)

^ are just a few other basic things to consider

 

[shchong2]

Hi Mr. Champion,

Thanks for your advise.
Well, I'm playing around with my fren's Eng Sample.
P4 2.4B G, with unlock multiplier.

I'm using his heatsink. (Not retail of course). 🙂
When OC on P4PE mobo, I set vcore to 1.5V (I don't feel like increasing it, since the heatsink sucks).
AGP/PCI = auto
The RAM I used are PC2100 (512MB + 128MB) ... PNY RAM but Samsung chip
.... well, I know this poor RAM will undermine my OC effort, but I've to live with it.

A couple more questions here, hope you don't mind :-
(1) When OC, would it be better to just use SINGLE RAM ?
(2) my PC2100 is suppose to have freq upto 266MHz at CL=2.5. Can I actually set my CPU's FSB to > 133MHz while having my RAM working fine ? (Shouldn't the 2xFSB = DDR_RAM-freq ???)
(3) Will setting AGP/PCI = 66/33 make OC more stable ?
(4) What's the advisable ratio for AGP/PCI that you would suggest ?
(5) What you mean by CPU : RAM = 1:1 ??

p/s :-
I'm trying to play around with the CPU using poor RAM and poor heatsink
well, I wish I have PC3500 and good heatsink to compliment the P4PE

Thanks. Hope to hear from you. 🙂

 

[ChampionAtTufshop]

1.yes use a single stick of ram because then you can experiment, and see which stick of ram will take higher frequencies. Sometimes if you have more than one stick, even if its rated to like 166mhz, one will overclock to 185mhz while the other will barely make it to 170mhz...thus forcing you to leave it at 170mhz if you use both sticks.

2.yes ram is rated to 266mhz DDR, that is 133mhz "normal" so to speak...the ddr thing just takes the ram frequency and doubles it since during once clock cycle ddrram can be read and written to, instead of just read OR write (how it was with sdram)

3. yes agp/pci 66/33 would be better because as you raise the cpu frequency the agp/pci frequency is also raised proportionately...which means when you go to too high of a cpu frequency, the pci frequency will be way out of spec and will cause most devices to not work/not let computer post/unstable operation

4. 66/33 or something really close to it (like try the next step up also just for kicks, maybe it will work)

5. what i mean by cpu:ram being 1:1 is if you have the cpu: ram at a ratio of 1:1, then for every 1mhz you raise the cpu frequency, the ram frequency is also raised 1mhz. Sometimes you will find boards that have a frequency of 3:4 (cpu:ram) or 4:5 (cpu:ram) available. So for those boards, lets say the 4:5 ratio, if you have cpu running at 133mhz the ram would be running at 166mhz (133*5 /4)