overclocking pentiumII 333 to 450+

[casanovalui]

i am currently using p2 333
but i really wanna overclock it to something at least 450+
can anyone tell me how to do it?
well i am using a p2 m747 mobo
the mobo's manual said it can only support up to 450mhz
but when i check out the bios, i can actually set it as high as 800
what kind of fan should i use?
pls help i really have no experience at all in overclocking

[Monaco]

I had that same chip, P2 333mhz. On mine, the multiplier was unlocked- back in the day all Intel chips were unlocked, not anymore!:) You could simply change the multiplier via the BIOS to whatever you liked. Or, on my chip, I could simply set the Front Side Bus in the BIOS to 83mhz- a nice speed boost without too much tinkering. If you motherboard supports multiplier adjustment, give it a try. It won't hurt anything if it is in fact locked.

After much tinkering, My P2 333mhz ran at 3.5x150mhzFSB, for 525mhz. But I had a lucky chip and really good cooling; 450mhz is probably attainable without too much effort tho. Mine did 3.0 x 150 for 450mhz for a long time until I put on the water cooler.:D

In order to change the multiplier and FSB, look in the BIOS screens you can acces with <DEL> or <F2> or whatvere your board has. If there are no adjustments in there for that sort of thing, look at jumpers on the board itself- it helps to have the manual!!:) You can set FSB and Multiplier via jumpers on many motherboards.

Sometimes you may have to increase the voltage of the chip in order to keep it stable. Not all boards can do this- sorry I've never heard of your board so I don;t know about it.:(

Hope that helped a bit.

MOR

[casanovalui]

since now i am still using only one fan on my P2 333
izzit ok if i just try to oc a LITTLE to 350
by 100X3.5 juz 4 the fun b4 i get the double fan ?
I read from some website saying that i should NEVER
change the front side bus (from 66 to 100)
because by doing that i am not only clocking the processor
but the whole system including the HDD.
There for if anything should happen, i will not only fry the
processor but the whole system. :(
but actually i find my system quite stable coz i always
left it running overnite and find it rarely crash :)

[lennytiger]

I think the system would not post if you set it to 100FSB without raising the core voltage of the PII.

On my PII 233 I have never tried to oc it but i can change the fsb to 100MHz but it never posts...

[outhouse]

You wont hurt anything it just wont post the only way you can fry your hard drive is if you overclock it pretty high and yes you may be running your PCI bus a little high but as long as your hard drive is not squeeling or making allot of thrashing noise then you will be fine, as long as you just raise your FSB or change your multiplier if you can you will not overheat anything you can raise it as high as you like as long as its stable when you overheat things is when you raise your CV [core voltage to your CPU] but you will need to raise CV when things get unstable. Anyway at this point go through the tips section and get yourself a good background theres more tricks that need to be learned at this point and when your done with a little reading your PC will thank you later :)

[Monaco]

Go ahead and bump it to 350- that's almost guaranteed to work. Moreover, setting a speed too high won't hurt anything; the machine will just crash at boot time or fail to POST. POST=power on self test, that's where the machine counts the RAM you have at the very beginning of bootup. If it fails to run happy, you can simply move the Clear CMOS jumper over to set everything back to defaults, and your machine will work again.

Yeah, you are right- messing with the Front Side Bus will alter the speed your cards and drives run at- but that is almost never a problem. I've never once damaged a component by running it at a bus faster than spec. I.E the PCI cards you have run at 33mhz. That 33mhz is found by applying a 1/3 divisor to your FSB, if you have a 100mhzFSB system. Change the FSB and it adjusts the PCI bus accordingly. My FSB is at 113mhz, and my PCI bus is at 38mhz because of it. No problems at all.

Of course if you stay within the standard FSB settings of 66, 100 or 133mhz busses everything will run at spec. No problems that way, plus you are still able to do some overclocking. It's a lot easier if your chip is multiplier unlocked.

As for fans, I used the stock heatsink and fan (HSF) unit it came with, and mine did 450 no problems. I had to scrape off that big thick silver thermal transfer pad and put on some regular thermal grease to do it, but that was easy. You should heed outhouse's advice- go read all the the tips article on the OC.com frontpage, they are very helpful.

[Monaco]

PS outhouse I'm going to sell you some punctuation!:):):) j/k

[casanovalui]

i had TRIED IT!!! but as u guys predicted. IT WON'T POST :( (if that's what u call it)
i had change the fsb to 100 and multiplier 3.5
100X3.5= 350 mhz without changing the v-core
i checked the manual, i have to set the jumper if to change the v-core. Too bad the only options are 2, either 3.5 or 5.0
well i guess that means i shouldn't change the v-core coz i read from somewhere that the v-core should be adjust not more than 0.3V.
but with the fsb of 66, the highest multiplier is already 5
66X5= 333 already
sigh, doesn't that means "NO HOPE TO OC" or "GET URSELF A NEW MOBO!!!" ?

[batboy]

Most of those P-II 333 had locked multiplier. A few of the early CPUs were unlocked, but they are rare. If your CPU is locked, then you can only overclock by raising the FSB. Check to see if you can do this with your motherboard. If you have a 75 MHz FSB setting, this will be your best option (5X75=375). The next best option would be to reach 100 MHz FSB as this will run the PCI and AGP buses in spec, but you'll definitely need better cooling and probably a slight increase in voltage. The general rule of thumb for beginners is to never increase the voltage more than 10% to 15% above default setting. If you actually do have an unclocked CPU, then look for a BIOS upgrade that will allow more multiplier settings.

[Monaco]

are you sure the 3.5 and 5 settings on that jumper aren't multiplier settings? It's been a long time since CPUs ran at 3 and 5 volts- the 486 days.

Either way, if it will not run at 350 (100FSBx3.5) then you may be out of luck. Some chips just do not like to overclock at all. That's a really small boost there, if it can't handle a 17mhz bump than I wouldn't even try higher settings.

but first- Look around for a jumper or BIOS setting called "#66/100 SELECT" or some such. This will tell the board you are using a real 100mhz FSB CPU, and it may work then. Also try changing any BIOS settings that talk about B21, I believe those are the same things with different names. The deal is, some old boards need to be told to switch from the bus divisors that work for a 66mhz FSB to those that will work at a 100mhz FSB. It'll try to run the AGP bus at 100mhz and the PCI bus at 50mhz, otherwise. That's WAY too far out of spec.

No POST means nothing came up on the screen when you tried to boot it, or it didn't get past the RAM count- unplug the power supply from the wall for a while, then try to boot it again. Sometimes motherboards get "stuck" when you try to OC them. Don't give up just quite yet- I have faith you can squeeze some more juice out of that chip.

If you want to do a little research, pull the chip out of the computer and copy down all the writing in it; then match that info up against other P2 333s in the CPU database on the front page- if everybody with the same exact chip can get 500mhz out of it you still have a chance!:D

[Yodums]

Just go little by little and then you'll find your max overclocking and monitor your temperatures.