overclocking an old pentium 133?

[projectb]

hi... i have an p133 on a compaq board... (more infos to the cpu to come...)
what chances are there to overclock it??

bye!
<PB>

[RADAR1797]

On Compaq computers with the P133 will most likely not be able to be overclocked. Appearantly there were two versions to the P133, one that the multipliers could be changed on and another that Intel locked. Compaq probably didn't even enable multiplier feeds to the CPU.

-RADAR

[Rat]

If that Compaq is a Deskpro, which I do know about, then the multiplier in the CPU is locked. The board does have Multipliers settings and the max FSB is 66 which it is already set to to achieve the 133mghz (66 X 2). Overclocking is not an option unless you are one of those lucky souls to have a rare unlocke multiplier CPU. Get the # off the CPU and look it up here: http://developer.intel.com/design/pentium/qit/ If it's not in the list, use the search.

Rat...

[knucklebusted]

Most of the 133's I've seen will overclock to a 2.5x66 easily (166). We had tons of the old Prolinea 5133's and 5100's. I had a bunch of the 133's at 166 and a bunch of the 100's at 133. I even got one 133 up to 200 but it was REAL hot but never locked up.

Good luck!

[CyrixClocked]

I had my old pentium 133 running at 166
83 x 3
It ran well no crahes or hangs but had to change the heat sink thought it did not crash in the original it was too hot

[Savant]

all the ones I've seen were multi-locked (as they are now) however, mine ran at an awesome (chuckle) 2x100=200MHz

[Peter M]

Not quite historically correct, though the outcome remains the same ...

The inital Pentium-133 had only one multiplier jumper input, allowing 1.5x or 2.0x.

Later, Pentium-150 and -166 were introduced. These had a second multiplier setting pin, doing 1.5x, 2.0x, 2.5x and later even 3.0x for 200 MHz.

From that later silicon, -133 speed grades were also made - and these also produce all three or four multipliers.

Regards, Peter

[knucklebusted]

Hmm, I've never seen a multiplier locked Pentium (classic or MMX) anything! I've used both the classic, full ceramic Pentiums and the newer Celeron-looking Pentiums (non-mmx) as well as the Celeron-looking MMX CPUs. I really can't say for sure about the 233MMX Pentium because I never tried anything but 3.5x multiplier (actually the same as 1.5x) but I did run it at 75mhz FSB with a better heat sink. I've still got the classic Pentium 133 in my office running at 200, verified with SiSoft as being 200mhz. Been that way since late 1996 when it was too slow with WinNT. Go figure.

[Bjelivuk]

mine p133 went 2x95 = 193, but on super7 mbo.

btw, is there any way to unlock cpu.

[Rat]

Bjelivuk,
You raised the FSB to achieve that overclock, not the multiplier which is likely locked. Alot of the systems that have the P133 installed from the factory only have a 66Mghz bus, some had up to 75mghz.

Rat...

[projectb]

hmm.. so i got a multiplier of -1 with cpucool... and wcpuid doesn't show me one at all... i think it's locked... but thanx guys...

<PB>

[hhh8785]

i got a pentium mmx 133 that easily overclocks to 233. it runs there with pretty good stability. all i had to do was go into the bios and change it there. but i don't know much about compaq boards or compaq bios, so they may not allow it.

(Edit) Oops... I forgot mine is a pentium MMX 166 overclocked to 233. I don't know if it matters but you never know http://sysopt.earthweb.com/forum/smile.gif



[This message has been edited by hhh8785 (edited 02-01-2001).]