Knowing which mainboard you have, might help. I've got an inkling it might be a 400 FSB board.

flupke11 wrote on 2021-04-22, 07:15:

Knowing which mainboard you have, might help. I've got an inkling it might be a 400 FSB board.

Apologies you're right, as soon as you said that I checked the manual and it does mention 400MHZ bus speed. It's a P4B-M, it could just be referring to bus speed of the processor that comes with it but I'm pretty sure it isn't.

I suppose you are still battling the P4B, if I read through your older posts.

I explained 800FSB cou's will not work, they're not designed to work on this board and they are not listed on Asus' list. For this board you need 400FSB CPU's. Two you listed should work from Bios version 1007 onwards.

The Front Side Bus speed is the speed (in MHz) between the CPU, the North Bridge and the memory. The North Bridge is the housekeeper chip on your mainboard, which takes care of interconnecting the CPU with the memory, and all peripherals (graphics card , USB, etc). Your North Bridge is the Intel 845 chip, only allowing CPU' with an FSB of 400 MHz, which is in fact 4*100 MHz.

The internal clock speed of the CPU is a multiplication of the base FSB (100MHz) times the internal multiplier of the CPU (24) which gives you the advertised speed of the CPU (2400 MHz or 2,4 GHz).

flupke11 wrote on 2021-04-22, 07:31:

I suppose you are still battling the P4B, if I read through your older posts. […]
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I suppose you are still battling the P4B, if I read through your older posts.

I explained 800FSB cou's will not work, they're not designed to work on this board and they are not listed on Asus' list. For this board you need 400FSB CPU's. Two you listed should work from Bios version 1007 onwards.

The Front Side Bus speed is the speed (in MHz) between the CPU, the North Bridge and the memory. The North Bridge is the housekeeper chip on your mainboard, which takes care of interconnecting the CPU with the memory, and all peripherals (graphics card , USB, etc). Your North Bridge is the Intel 845 chip, only allowing CPU' with an FSB of 400 MHz, which is in fact 4*100 MHz.

The internal clock speed of the CPU is a multiplication of the base FSB (100MHz) times the internal multiplier of the CPU (24) which gives you the advertised speed of the CPU (2400 MHz or 2,4 GHz).

Right that's making more sense now. I don't see where you found 1007? I'm only seeing up to 1006.005 but I installed 1005 just because the newer one being beta sounds a little iffy to me. Thought I'd start at 1005 and see if it works.

You shouldn't worry too much about Betas on the Asus site. I usually flash the latest available, beta or not.

The 1007 was on the P4B page, not the P4B-M. So you can disregard that comment of mine.

flupke11 wrote on 2021-04-22, 07:48:

You shouldn't worry too much about Betas on the Asus site. I usually flash the latest available, beta or not.

The 1007 was on the P4B page, not the P4B-M. So you can disregard that comment of mine.

Alright thanks for the help, I'll let you know how the SL6PP goes when it arrives.

Acording to this review https://m.hexus.net/tech/reviews/mainboard/242-asus-p4b/, Asus P4B (full ATX) being its big brother based on the same chipset, worked just fine with 533MHz Northwood.
So you may give it a try.

zyga64 wrote on 2021-04-22, 09:52:

Acording to this review https://m.hexus.net/tech/reviews/mainboard/242-asus-p4b/, Asus P4B (full ATX) being its big brother based on the same chipset, worked just fine with 533MHz Northwood.
So you may give it a try.

I don't think it will work man, as flupke11 explained the "North Bridge is the Intel 845 chip, only allowing CPU' with an FSB of 400 MHz, which is in fact 4*100 MHz."

Looking at https://www.asus.com/supportonly/P4B-M/HelpDesk_CPU/ then only 400MHz FSB CPUs are supported

Same for mentioned P4B https://www.asus.com/supportonly/P4B/HelpDesk_CPU/ (only 400MHz).
But it may work when overclocking chipset. I'm not saying that it will work for sure.

Asrock for example promised 1066FSB on i865 (officially max 800MHz) - ConRoe865PE, 775i65G. It's nothing unusual...

Anyway, it will be throttled by SDR SDRAM memory...