help overclocking issue cant fint a way to adjust cpu voltage

[10 mhz of FURY]

the problem im having is that my cpu on my p2 is that it works fine under 0 to 50% cpu usage but any higher it just quits and a blue screen pops up
i overclocked it from 400mhz to 533mhz there is no heat problem what so ever could this be a core voltage problem or is the cpu just saying enough is enough also i cant find the jumpers for the cpu voltage this bord uses a multiplier no bios cpu detection the mobo is a asus p28 rev 1.02

thanks in advance

[Terry Yager]

the problem im having is that my cpu on my p2 is that it works fine under 0 to 50% cpu usage but any higher it just quits and a blue screen pops up
i overclocked it from 400mhz to 533mhz there is no heat problem what so ever could this be a core voltage problem or is the cpu just saying enough is enough also i cant find the jumpers for the cpu voltage this bord uses a multiplier no bios cpu detection the mobo is a asus p28 rev 1.02

thanks in advance

I dunno, I'm still trying to figger out how to kick my Kaypro II up to 4MHz...

--T

[Vlad]

PII wise, a lot of slot 1 mobos just physically can't go that high. Like I have a PII machine that has a 400MHz processor, but the mobo cannot go beyond 450MHz. You probably just clocked it above what the machine can handle.

[10 mhz of FURY]

so this is a mobo issue? not a cpu issue

[Vlad]

Sounds like it. Whats the make and model of the motherboard?

[10 mhz of FURY]

asus p28 rev 1.02

[Vlad]

Hmm, AsusTek didn't list a P28, but they do List a P2B. It had BIOS updates but no manual. Is it possibly a B and not an 8?

[chuckcmagee]

I own a P2B-B. It doesn't have any Vcc jumpers on it. Vcc is almost always set by the CPU chip itself. So, yep, I would say the core voltage is dropping to too low of a value. I gave up on overclocking myself. I had some success with the 600 MHZ Pent III but the 1000 MHZ ones refused to be overclocked by more than a few percent. I got tired of the Blue Screen of Death when I was trying to copy large files over the network. Just put everything back to factory specs and left it alone after that.

[IBMMuseum]

I own a P2B-B. It doesn't have any Vcc jumpers on it. Vcc is almost always set by the CPU chip itself. So, yep, I would say the core voltage is dropping to too low of a value. I gave up on overclocking myself. I had some success with the 600 MHZ Pent III but the 1000 MHZ ones refused to be overclocked by more than a few percent. I got tired of the Blue Screen of Death when I was trying to copy large files over the network. Just put everything back to factory specs and left it alone after that.

I often look at the practical aspect in overclocking too. If an easy, inexpensive (600MHz PIII operating at specs versus PII 400MHz overclocked by 33%) CPU upgrade exists for the motherboard in question, why just not use it? Ok, I'm not a mountainclimber, so the "Because it's there" argument doesn't work with me.

Granted I didn't Google (many OC forums & sites are out there, testing all possible combinations) for data in this case, because if the OP didn't, why should I? It sounds like the FSB was brought up to 133MHz from 100MHz (since many PII are multiplier-locked). Was there also a correponding upgrade to PC133 DIMMs too?

While a 533MHz CPU with 133MHz FSB is going to be on par (or maybe even better) with a 600MHz CPU with 100MHz FSB of the same class, we are comparing a PII to a PIII here. With talk of a 1000MHz PIII (meaning 133MHz FSB, maybe natively) working there until it is overclocked, why not (although more expensive) go with that option? Probably pretty evident I'm not that big on OC.

[chuckcmagee]

Oh crud, I forgot about the FSB deal. That is likely the real reason it isn't working! I had no luck at all when I tried to drive the 100 FSB at 133!

[10 mhz of FURY]

this is not my main pc im using it as a connection between my wifi network and my ethernet network and i dont whant to take up any extra power of my main pc it seemed to worked ok when i bumped it down whats funny though i set it to as fast as the mobo could go and it came back up as 400 mhz the board can go 600 mhz roughly on max but didnt is this intel$ crappy way of anti oc'ing but yet again this cpu doest get hot i dont know why it doesent even when oc'ed it doesent get hot?

[IBMMuseum]

this is not my main pc im using it as a connection between my wifi network and my ethernet network and i dont whant to take up any extra power of my main pc it seemed to worked ok when i bumped it down whats funny though i set it to as fast as the mobo could go and it came back up as 400 mhz the board can go 600 mhz roughly on max but didnt is this intel$ crappy way of anti oc'ing but yet again this cpu doest get hot i dont know why it doesent even when oc'ed it doesent get hot?

Ok, used as a bridge. Far lesser systems can be used in this capacity too. Even dedicated units that are pretty small.

Most of the PII series are locked multiplier (meaning that your multiplier of four times the 100MHz FSB can't just be dropped over to run six times 100MHz FSB). When a 600MHz CPU is brought up in this case, it means a PIII with 100MHz FSB, 6x multiplier. The PII wasn't designed above 450MHz with a 100MHz FSB (4.5 multiplier, and the max was 5x with a 66MHz FSB for 333MHz), and didn't have above a 100MHz FSB.

PIII (both in Slot 1 & Socket 370) started with a 100MHz FSB, and later had a 133MHz FSB. Slot 1 Celerons at these levels add further details (in some Slot 1 with 66MHz FSB configs you can sometimes get a Celeron going to a higher clock speed, but with lower L2 cache). If you want an easy 600MHz for your application, get an inexpensive PIII-600 (but not the 600B or 600EB models, which are 133MHz FSB). My last one (more than a couple years ago) was low cost.

An 850E PIII (fastest 100MHz FSB) might be possible, but best to check the OC forums. Just about every older motherboard is rated for OC ability or fastest CPU possible out there. Start Googling.

[Terry Yager]

Ok, while we're here, a couple of questions:

1). Why does it take over 20 minutes to boot my Thinkpad 600 with a 400MHz Celeron (MMC-1) CPU board installed, and
2). Why doesn't my TP 600E like P-III (MMC-2) CPU boards (127 errors, but still boots & runz), and
C). What can I do to (cheaply) upgrade one or the other one of them beyond 400MHz?

--T

[IBMMuseum]

Ok, while we're here, a couple of questions:

1). Why does it take over 20 minutes to boot my Thinkpad 600 with a 400MHz Celeron (MMC-1) CPU board installed...

OS? RAM? I really don't have information on the mobile Celerons, but if the same as the Slot 1 level, it is a Mendocino core, 66MHz FSB, 128Kb L2 cache.


2). Why doesn't my TP 600E like P-III (MMC-2) CPU boards (127 errors, but still boots & runz)...

Do you have the latest BIOS? What is the model/submodel code? There is no listing for a "127" error in my generic references, but 120 is a CPU self-test failure, 121 is an unexpected interrupt.


C). What can I do to (cheaply) upgrade one or the other one of them beyond 400MHz?

I don't have a 600E myself (see the "Portables" thread) & not familiar with it. Lenovo has purged most of the older IBM systems' information, but that level should be around. With the model/submodel I can look some more.

[chuckcmagee]

I own a 1000 Mhz PIII with 100 FSB (yes, a coppermine, of course). If I remember, it's a 1.65v core. Granted, extremely hard to find.

[Terry Yager]

My TP-600 HMM just lists '12x' errors as 'mainboard', not very informative. I haven't yet taken the time to search for BIOS updates, but I am hoping that there will be one available to see the P-III.

--T

[jpenta]

don't blame me if this messes it up, ok well blame me. I've heard of a way to free the multiplier, and i've heard that it doesn't work. it's a bit like vid pinning. Take the processor label side towards you and look at the pins. Find the bottom row and count over eleven (11) pins. Carefully put adhesive tape on only that pin. If this is true you will then be able to overclock it higher without the need to change voltage. I HAVE NO CLUE IF THIS WORKS. Just a rumor i've heard and am too scared to try.

[ahm]

Oh that's just ridiculous.
What do you suppose "putting adhesive tape on a pin" will do?
Insulate that pin? No.
Make it difficult to reinsert the chip? Fill that socket with gunk? Certainly.

[jpenta]

i have my doubts about it too. i told you i've never tried it and i really don't intend to.
btw on a slot processor ( such as the one i presume the thread is about) you probably could squeeze it in there no problem
the pin is labeled b21, google its function for slot one. it sets the default bus speed and is rumored to affect the clockrate

[10 mhz of FURY]

don't blame me if this messes it up, ok well blame me. I've heard of a way to free the multiplier, and i've heard that it doesn't work. it's a bit like vid pinning. Take the processor label side towards you and look at the pins. Find the bottom row and count over eleven (11) pins. Carefully put adhesive tape on only that pin. If this is true you will then be able to overclock it higher without the need to change voltage. I HAVE NO CLUE IF THIS WORKS. Just a rumor i've heard and am too scared to try.

i have to get a new video card my old one died but i might try the tape trick

[jpenta]

i have to get a new video card my old one died but i might try the tape trick

dont waste your time. i got tried it on an old p2 400, and the only thing that happened is that it just wouldnt boot. but when i took the tape off it was fine, so if you really want to try it go ahead.