Posted on 2004-09-26
Medium Priority
Last Modified: 2010-04-26
I have a <clearing throat> Pentium celeron 600 mhz . I want to overclock it. How?
Question by:pserviss

Expert Comment

ID: 12155364
Hi matey

Really i need to know extactly what model of Celeron you have.

but this is probley the best resoucre to point you towards, it has a hand holding tut to guide you thought the process of overclocking! ;)


Good luck and remeber to only over clock in steps! dont try to take it upto 1GHZ on you first hack! :)

LVL 69

Expert Comment

ID: 12159390
A Celeron 600 runs at 66MHz Front Side Bus (FSB) and requires 1.5v.  Whether you can overclock depends on the motherboard, and how much will depend on the manufacturer's quality.  Most BX boards can be overclock a Celeron by bumping up the FSB, and this involves changing it from 66 to 100, giving you a 50% improvement.  I have done this with a 300a and a 550 using an Abit BH6, and the only other thing I had to change was the AGP/PCI multipliers from 1, 1/2, to 2/3, 1/3 (you want to keep the AGP at 66 and the PCI at 33).

Expert Comment

ID: 12173599
Look, as the Callandor already wrote, almost (I think every, but I’m not sure) mobo from that period supports at least FSB=66 and FSB=100 (because in that time Pentium3® CPU’s were also sold which had FSB=100, and the same mobo’s were used for both). FSB (front side bus) frequency is frequency (what a fragment) on witch CPU communicates with the rest of the system. Besides that important thing for you (well anyone who want to do some OC) is what multiplayer your CPU has, because your CPU frequency = multiplayer x FSB frequency. So giving that you have Celeron® 600, and your FSB frequency is 66 MHz your multiplayer is 9 (it can only take either integer or .5 values). So if you set your FSB to 100 MHz resulting CPU frequency would be 9x100 MHz=900 MHz. You can adjust your FSB frequency by jumpers or some dip switches on your mobo, (and now I can’t remember weather or not there were some mobo’s that allowed changes to FSB frequency to be made thru BIOS). Anyhow you should consult your mobo manual to see how you can change your FSB frequency. Also note that some mobo’s allowed you to set FSB frequency to some values in between 66 and 100. If your mobo has that option it would be the smartest move to use the lowest value (well at least the lowest one that is greater then 66) first because you never now what your CPU is capable of.
One more thing, at frequencies that are higher than stock your system can (and probably will) be unstable thus making some everyday work on it impossible. In cases like that increasing CPU voltage can help, but please note that increasing voltage leads to greater heat dissipation thus making better cooling necessary. (You probably won’t be able to change your CPU voltage because it would require you to solder some resistor on your mobo, and places where you need to solder are different on every mobo out there.)
One last thing ANY OC voids your warranty. In your case your warranty has expired so it’s not the case, but for future notice. Also OC can lead to your part stop functioning (due to overheating mostly).

Expert Comment

ID: 12173655
Also what I forgot to mention as is very important. You will need PC100 SDRAM in order to set your FSB to 100, because FSB frequency is also RAM frequency (well most of the times) and if you’re going to ran your memory at frequency of 100 MHz then it should be rated to work at that speed. And also note what Callandor wrote about changing ratio AGP/FSB and PCI/FSB because they are also dependent on FSB (as you can see) and running them on higher frequencies will only cause instability issues and none performance gain.

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