is it possible to overclock a PII 300/fsb66mhz on asus P2B???

[gekkejopie]

can anyone help me??? I tried to overclock my cpu but windows won't boot if I overclock it to 400mhz 100mhz fsb. My memory supports 100mhz and also my motherboard.

if so what do I have to keep in mind when I do so......

i've got a dual fan would this be enough if I overclock my cpu??

is the riskue greater than the gain in performance??

[Breadfan]

The problem is most likely oc'ing the FSB. I too have a PII 300 with 66mhz fsb. The problem is, the cpu has a command that put the fsb at 66. Change the board settings and it won't work...infact my board won't even start.

However there is hope. Of all the gold contacts on the cpu (where it attaches to the slot) one of them carries the 66 fsb command. Paint over it with fingernail polish and its defeated adn you can put your board wherever you please.

Only problem is...I don't know which contact. I used to have the URL to a site that said which one, but I lost it. I actually just posted a message regarding that, and hopefully someone here will know wehre to find that info, so check it out.

As for your fans, make sure you have a beefy heatsink. I have a large Antec heatsink w/ dual fans that keep my PII under 90F no matter what. There is so much talk about PII300's being underclocked 450's that you shouldn't have much of a problem, but keep an eye on the temp...

Mike

[gekkejopie]

I found a site this afternoon that says that there are 2 different pII 300 cpu's this is the site http://bxboards.com/sl2w8.shtml

[Breadfan]

Yeah there are two different kinds....I don't remember the names but one is a .33 micron and the other is a .25 micron I believe. The .25's are kinder when it comes to ocing, but from what I've read the older moldels can also do ok.

Mike
P.S. There is an article in the Tips and Techniques at www.overclockers.com called "Observations of a would-be PII overclocker." Its a great article with info on the two different pII's and how to determine which one you have.

[gekkejopie]

I overclocked my cpu to 3x112mhz it works!!! I runned a couple of games(quakeII/half-life/3dmark 2000) and the temperature only rose from 21c to 23c

I think I'll keep it this way.

By the way I found out what kind of PII300 i've got it's a
Speed (MHz) Boxed Test Specification (S-spec) OEM Test Specification (S-spec) Stepping CPUID L2 Cache Size Thermal Spec
(°C) Thermal Design Power (W) Notes
300SL2QC SL2HA C1 0634 512K 72 43.0 1,3,5,7

[gekkejopie]

well it worked for a short while...... windows started crashing and bugging so I just turned the FSB to 100mhz.

[LutaWicasa]

Block pin B21. I used a bit of tape.Oh, and by the way messing with your multiplier does nothing. PII300s are clock locked. The only oc you can do is upping the FSB.

[gekkejopie]

damn if they are clock locked then i already am at the max...... I had it on 112mhz but windows crashed a lot.....so now i've got it at 100mhz but can I set it to 4.5 x 100 if I block that pin???

[DocClock aka MadClocker]

Some early PII's could be backed down..the multiplier could be droped, but not uped..like my freinds PII266 can be set for 3x100, instead of the default 4x66, so check it out...because some do, and some don't :-)

[gekkejopie]

well I've tried everything but it does seem that the klamath technology doesn't allow frequencies above 300mhz
they can go there but they're not stable.....
i've clocked mine to 3x100 now I already had this setting so I didn't go forward.... it seems that I have to go collect my savings and save a lot more for a new pc.......
any suggestions on a pc???

[DocClock aka MadClocker]

You could try upping the volts a little at a time..I could not reach my sig speed without upping the volts from 1.65 to 1.9, and I'm actualy thinking of upping it a little more,...I don't remember what the default voltage is for a klamath, but you could go one notch at a time, and observing stability, just remember that with extra voltage you need extra cooling.

[gekkejopie]

I can't set the voltage higher because the motherboard detects it automaticly...... no jumpers or what soever.

grz jopie

[DocClock aka MadClocker]

nothing in the cpu setup at all? look for words like vcore, and cpu volt....and look for things like default, and see if they can be manipulated.
If you mention your board type and brand/model I'm sure somebody will have experience with it, and advice.

[gekkejopie]

Well I mentioned it already! but what the heck

brand Asus
Model P2B

grz jopie