Forget the revision of the P2B. You need to check the voltage regulator. I have a P2B rev. 1.10 working with a 1,1ghz coppermine, so you get the picture.

The Intel BX chipset has no official support for a 133MHz FSB. You will be overclocking several parts of the board. I would not recommend it, but it might work.

The multiplier is locked in the CPU, so the board's settings will be ignored/overridden.

Voltage support will depend on the revision AND the voltage regulator on the board.

EDIT: there is a recent thread here on a similar subject: P3 600B on Asus P2B 1.04

Cyrix200+ wrote:

The Intel BX chipset has no official support for a 133MHz FSB. You will be overclocking several parts of the board. I would not recommend it, but it might work.

The BX chipset has PCI dividers for 133 mhz operation, but not generally not AGP. Thus, your PCI cards will be fine, but your AGP card will be running at 88.7 mhz bus clock. So, the NB will be overclocked, the memory controller will be overclocked, the AGP bus (not the GPU, though) will be overclocked. I believe this is the extent of the risk.

The only slot 1 i440 board I know that will safely work @ 133Mhz is the ABIT BE6II. As far as I know the P2B does not support 133Mhz FSB, but later revisions should come with an overclocking option for 133MHz. I'd advise against it, since you will be running AGP out of spec.

I have the P2B-LS variation, and I could never get it working properly beyond 112 MHz.

I know this answer is a bit late.

The Asus P2B is a bit of a special case. It's one of few really early Socket 440 BX motherboards that can have support for the 133/4 PCI-divider.

As always It depends on the clock generator. The pre-release boards can have the correct divider but the 133 MHz FSB setting isn't silk screened if it exists. The first retail revision (1.02) has it but the 133 MHz FSB setting isnt always silk screened. Revision 1.03 and 1.04 if they exist probably have it.

With revision 1.05 (if I remember correctly) Asus changed the clock generator to one that diddnt support the /4 PCI divider at 133 MHz but they still silk screened the 133 MHz FSB setting.

Later (dont remember the exact revision) Asus changed the clock generator again to one with 16 settings with one beeing the 133(33) one but they kept the jumper block with 3 FSB jumpers and the 133 MHz setting you could access was of course the 133(44) MHz one. With even later revisions they fixed this by adding a forth jumper in the FSB jumper block.

Boards earlier than revision ~1.12 rarely have VRMs with support for voltages below 1.8v, use a slotket with VID selection jumpers and jumper it for 1.8v. You can even run a 1.4 GHz Tualatin-S this way as the P2B has pretty bad vdrop+vdroop so the actual voltage at 1.8V is ~1.7v during load (at least with my board). I dont take any responsability for Tualatin experiments though as the VRM circuit isnt designed to handle the resulting current (use active cooling on the VRM components and be prepared to replace VRM mosfets and perhaps even the CPU should the magic smoke escape).

All above is only true for vanilla P2B motherboards. Later models like the P2B-F probably do everything right regardless of revision.

It's years ago I tested and researched this and I cant find any notes or the thread I thought I posted here on Vogons so everythng written above is from memory alone and my memory isn't perfect.

Perfect cpu guide for P2B, P2B-F, P3B-F etc. :

http://homepage.hispeed.ch/rscheidegger/p2b_p … pgrade_faq.html