440BX chipset.

You could try Intel's official ID utility. I don't remember the name of it, but I think it can run from a bootable floppy.
It's included on the "Ultimate Boot CD" if you happen to have a copy of that.

Intel still offers it:

https://downloadcenter.intel.com/product/672

Intel® Processor Frequency ID Utility Bootable version [BFID_X25.EXE]

The bootable version of Intel® Processor Frequency ID Utility can be used to
identify Intel® processors for non-OS dependant systems.
OS Independent
7.2 Latest

Thanks, tried using that and it actually properly detected it this time!

Do you have the latest BIOS for that board? A lot of the slot 1 boards, especially the older ones, get kind of funky when you stick a Katmai or Coppermine in it and the BIOS has not been updated. They won't detect correctly, or the cache won't work, or won't detect the speed correctly because they're using the jumpers instead of ignoring them like they're supposed to for PIIIs.

EDIT: I can't fucking read, apparently. As was mentioned in the thread, you have an E processor, which runs at 133 Mhz, and (most) BX's can only do 100, so you're getting the fixed multiplier times the bus speed. The abover information still stands though, especially about the BIOS update.

If you stick that in the FX chipset, it will run at 300Mhz.

Moogle! wrote:

Do you have the latest BIOS for that board? A lot of the slot 1 boards, especially the older ones, get kind of funky when you stick a Katmai or Coppermine in it and the BIOS has not been updated. They won't detect correctly, or the cache won't work, or won't detect the speed correctly because they're using the jumpers instead of ignoring them like they're supposed to for PIIIs.

EDIT: I can't fucking read, apparently. As was mentioned in the thread, you have an E processor, which runs at 133 Mhz, and (most) BX's can only do 100, so you're getting the fixed multiplier times the bus speed. The abover information still stands though, especially about the BIOS update.

If you stick that in the FX chipset, it will run at 300Mhz.

This motherboard officially supports all Slot 1 processors up until the 700 and 733MHz Pentium III's. Like I said, the BIOS does report the EB suffix, unlike CPU-Z. So far it seems only Intel Processor ID Utility reports it properly outside of it.

What motherboard and chipset is it? Non Intel Slot boards are getting hard to find.

General P6BX-An with BX.

Yup, that would be the reason then. E/EB cpus have 133 Mhz FSBs, and the none E/EB have 100Mhz. The BX chipset doesn't officially support 133Mhz operation, and the multiplier is locked.

4.5 x 133 = 600
4.5 x 100 = 450
4.5 x 66 = 300

There are four 600MHz Slot 1 versions. The 'E" indicates Coppermine, not the fsb.

Katmai;
Intel P III 600 MHz. fsb 100
SL3JM, SL3JT
Katmai;
Intel P IIIB 600 MHz. fsb 133
SL3JP, SL3JU

Coppermine:
Intel P IIIE 600 MHz. fsb 100
SL3H6, SL4C7, SL3NA, SL44Y, SL43E
Coppermine:
Intel P IIIEB 600 MHz. fsb 133
SL3H7, SL3NB, SL3XJ, SL44Z, SL4C6

The nicest of the above for a BX board are the latest E versions, an SL43E here happily runs at 800Mhz without overvolting.

So it's the B marker that indicates FSB?

Ok, I don't know why I wrote "general" instead of Tekram in my previous post, but I can say that this site looks horrendous on mobile. My system is really stable in its current state with its 133MHz FSB but I think I might want to put a Katmai 500 or 600 in it for nostalgia sake. How notorious are the Intel stock fans on Slot 1 CPUs?

The "B" indicates fsb 133.
Nice system you have there, btw.
You will probably not notice much difference between a Katmai 600 and a Coppermine 600. If you want to go seriously nostalgic you could install a Pentium II/Celeron 266 Mhz @ fsb66 and "enjoy" the early days of the generation 😉.

If I really wanted to get nostalgic I should probably get a Socket 5 Pentium 75 or 90 instead. I'd like to try the Katmai 500 because it was the processor of my last PC which I was really fond of before I got a proper Core i5 machine in 2010 and also because there's a few deals on eBay that come with the stock cooler, so asking again... are they really loud or is there anything really wrong with them? My cooler has a plastic mounting piece for 40mm fans (the cooler master one) and if the one on the stock cooler really sucks I'll also get a 40mm Noctua.

Other users will have to answer that - I do have some SECC's with stock cooling but they are only for very occasional benchmarking/comparison purposes. Don't think there is anything -wrong- with them but the sound of small fans from that period is usually more noticable than modern solutions (with larger sinks and larger fans) and they tend to get worse in that respect over time.

hello,
the Pentium III encodes its stock FSB in the MSR register 2Ah bits [18-19] :
0 for 66 MHz
1 for 133 MHz
2 for 100 MHz
this allows software to tell if the model is a B or not. However, some B models do not set that register correctly, and therefore are reported as non B versions (except my the Intel app that must use another trick to figure out)
In your case no doubt is possible, because no 450E model exists.

Thank you for the details, so I was definitely right when I thought the same. They really rushed the Slot 1 B and EB models and didn't even create a proper chipset for it.

PKFreeZZy wrote:

Thank you for the details, so I was definitely right when I thought the same. They really rushed the Slot 1 B and EB models and didn't even create a proper chipset for it.

There are Intel 810 and Intel 820 chipset motherboards for slot 1 cpu's with native fsb 133 and there is at least one Intel 815 chipset motherboard with slot configuration, the ABIT SH6.

PARKE wrote:

PKFreeZZy wrote:

Thank you for the details, so I was definitely right when I thought the same. They really rushed the Slot 1 B and EB models and didn't even create a proper chipset for it.

There are Intel 810 and Intel 820 chipset motherboards for slot 1 cpu's with native fsb 133 and there is at least one Intel 815 chipset motherboard with slot configuration, the ABIT SH6.

That's pretty cool, though it's a real bummer they don't have any ISA slots.