P III 500

[maxwell]

Anybody try to juice this one yet? I understand it is clock locked, but isn't that just the multiplier? I have it on an IWill BD100 (up to 8x@133). The chips a little too expensive for me to experiment with.Any suggestions?

[chad174]

so your running at 1.024 ghz?? thats a lot...i would try somewhere around like 8 or 9 hundred mhz...and get a lot of cooling.

[HomoJesus]

Chad that is what his mobo will support not what he is currently running at. I can see 150 200 mhz's out of a celron but of o/c 500 no thank you .

[maxwell]

Hey Chad, thanks for the smart-assed remarks, but let's keep it friendly, OK? Thank you Jesus for a friendly comment.

Now, anybody have any real answers?

[CheezX3000]

I've also been wondering about this. The theory is actually that Intel has put something into the chip which actually measures its frequency (that's what hertz is, after all) to keep it from being overclocked out of a certain range (approximately 5 MHz, from what I hear). That means (I'm explaining for newbies, not trying to insult your intelligence, max) that if a 450 MHz PIII goes outside of 445-455 MHz, then it'll stop working (I'm not sure precisely what the consequences are). However, I know someone who knows someone else who claims to have pushed a 450 PIII up to over 600. This seems to be very unreliable information, so I'm going to continue to look into it. I'll post anything new that I find. In the meantime, don't try to change ANYTHING, FBS or multiplier! The processor might not work at all at anything outside of 495-505 MHz, so I wouldn't suggest trying it without knowing more.

[Joel Kleppinger]

Well, there seems to be a lot of conflicting hearsay, but I still have yet to hear of a confirmed CPU that is frequency locked. My OEM P3 450 does 558 MHz without a sweat with default cooling, but requires a bit of love (2.2v) to make it to 581 MHz. All this is on a BX6 II, BTW. I think I've been pretty lucky, but I'm not positive. It's the only P3 sample I've seen. BTW, this came straight from a reseller so anyone could have bought it... I just got lucky http://www.sysopt.com/forum/smile.gif

Joel

[Isos]

Got two very stable @560. Will work @620 2.2v, but for now 560 is just fine.

[ANTONIO E GUERRA]

Please, check overclockers.com. As far as I know, Intel has tried to lock up their chips without any success. There is always better chance with the Celeron version.

[This message has been edited by ANTONIO E GUERRA (edited 04-06-99).]

[Amburgey]

P3- OC Facts...
EVERYTHING is adjustable...
With luck (and a CPU monitoring software) and you get a P3-500 to 5x133 STABLE.. (luck being chip quality)

Right now on a Tyan 1836DLUAN i've got (2) @ 560 ROCK solid stable.. With a -beta- bios release i've increased the FSB to 133MHz , and again with 2.2 it was stable with (1) CPU.

On EVERY mb i've seen that has 5x112, it has been stable... (PROVIDING... fast enuf memory) ie <=8ns cas2 (actually REAL tuff CAS2 is VERY stable at 133MHz)

[Joel Kleppinger]

No, not EVERYTHING is adjustable. The multiplier is still locked just as in the Celeron and 100 MHz FSB P2s. I've tried running my P3 450 @ 500 MHz, but it just boots at 450 anyway. It totally ignores the multiplier.

BTW, don't think it is because the CPU can't handle the overclock to 500 MHz because it works like a charm at 558 MHz, default voltage.

Joel

[BBA]

Hey Joel, what mb do u have?

BBA

[duh]

The early pIII's are not locked at all but the later ones are multiplier locked.

NOTES:

"These prossers will only operate at the specified core bus frequency ratio at which they were manuafactured and tested. For both the pre-production and production processors, it is not necessary to configure the core frequency ratios by using the A20M#, IGNNE#, LINT[1]/NMI and LINT[0]/INTR pins during reset."

"These processors will not shut down automatically upon assertion of THERMTRIP#".
[edited by ROY at www.sysopt.com/forum/Forum3/HTML/000470.html]

What ever that means? If anyone explain that for me please tell me. (A20M#, IGNNE#, LINT[1]/NMI, LINT[0]/INTR THERMTRIP)I'll dig up some more info on it.

[CheezX3000]

That really bites...there has to be a better solution to the problem of remarked CPUs than preventing all overclocking! =(
BTW, is there some way to tell whether the P3 you're buying is multiplier-locked or not BEFORE you shell out over $600 for it?
-CheezX3000
P.S. K6-3 is much cheaper, and FASTER in many areas! Can someone point me in the general direction of a good motherboard for overclocking the K6-3 (not Slot1, so I can't use BM6-II).

[Roy]

I guess you guys aren't paying attention. Isos found the message, I brought it here.

Simply stated, the P3 is multiplier locked. That's all.

www.sysopt.com/forum/Forum3/HTML/000470.html (http://www.sysopt.com/forum/Forum3/HTML/000470.html) - ratio = multiplier.



[This message has been edited by Roy (edited 04-07-99).]

[cobain1crt]

might wan to try the pin 21 thing out. You want to push the buss up to 133mhz, and you can easly hit 665, if somehow intel did clock lock it, what will you loose? 20 minutes, a little stress, if you cont overvolt it there is no real danger, and if you do, and it does not work, you will only loose a few minutes of processor life, I know that may seem major for you expensive chip, but in 10 years (when it would burn out acording to intel) it will suck, trust me.

[Joel Kleppinger]

I've used it in the Shuttle HOT-649 and the BX6 II. Currently, I have it in the Shuttle board. The BX6 II got it up to 581 MHz @ 2.2v.

The P3s that you find that aren't locked at all are engineering samples, and your odds of finding one of those any more are VERY VERY slim. If you want a P3, just buy one expecting a multiplier lock. If you happen to be incredibly lucky, and yours isn't locked, then be very grateful. http://www.sysopt.com/forum/smile.gif

I haven't been able to run my P3 450 at 6*84 (450) so that kinda shoots down the idea of no multiplier lock even if the final speed is nearly identical.

Some thoughts,

Joel