PII 350 will possibly work with 66MHz bus, but that would give you a 233MHz chip. The 440FX is OLD! I didn't even know you could get one with a SLOT1. I thought they all had Pentium Pro sockets. I always assumed 440LX was the first intel chipset to accept PII, but I guess I am mistaken! Surprisingly the board is even made by intel!

Yeah, I was pretty confused when I saw it too. The guy selling it didn't know what he had and had it listed as "Slot 1 motherboard." I had to have a close look at his pictures and then do some homework to find out what it was. Finally, I got it for just $30US. It's got a built-in opl3 (onboard sound is pretty rare for this era I think) in addition to 3 ISAs. Anyway, when I get the memory, I guess I'll try out with the 350, although cpu-world does not list the 440FX as a supported chipset for that cpu, whereas for the p2 266, it is listed as a supported chipset. This substantiates the information in the manual. I'll see what happens. Thanks.

Celeron 433 might work as a drop in CPU?

Otherwise I think a basic slot 1-370 adapter could work with a 533/566mhz celeron, after that you might be spending big bucks for something faster.

No, it appears this board supports pentium pro (with socket 8 to slot 1 slotket) and early pentium ii only. Certainly no late model p3s.

This brings back the memories of the seemingly infinite time between the pii233 release and the pii300 of the original generation. Further the rarity of the systems at release

A 300 66mhz fsb should work fine as it’s in the same family
As should a 333 despite it being the next generation

You won't know for sure until you try. Maybe intel was being a bitch and did something sneaky with the BIOS to stop the board from booting with "unsupported" CPUs. There is no reason why faster CPUs shouldn't work as long as the board supports the correct voltages.

My Deskpro 4000 has a 440FX slot 1 board. It works fine with 233-300MHz Klamath PIIs, but it just won't recognize the L2 cache on Deschutes (333+ PII), Mendocino (Celeron), or Katmai (PIII). I'm not sure if that's a 440FX thing or a Compaq thing.

According to Intel the board is listed as supporting up to Pentium II 333 MHz with 512KB L2 cache (qualified) and Celeron 333MHz (unqualified)

Well, I guess I'll just pick up a used pii 266 on ebay. They seem to be pretty cheap.

Anonymous Coward wrote:

You won't know for sure until you try. Maybe intel was being a bitch and did something sneaky with the BIOS to stop the board from booting with "unsupported" CPUs. There is no reason why faster CPUs shouldn't work as long as the board supports the correct voltages.

The voltages are what I'd be worried about, it's 2.0V for the 350 instead of the older models' 2.8V. The FX is so old that they may didn't even think about supporting lower voltages in its time.

I've seen a Slot1 440FX board toom btw, but it was some proprietary stuff. An EDO RAM P2 would be an interesting test subject, though. And I like the 350 too, if it takes 133MHz FSB it's pretty versatile, ranging from the smallest P2 at 233MHz to slightly above the latest and greatest at 466. For not only Celerons are overclockable 😀

It all depends on VRM and Bios, the chipset does not matter in that case. Intel boards are known to be pretty unflexible, but on my Asus KN97 I can even run Tualatin CPUs on Slot adapter without hardware modifications.
If your VRM only supports 2.8V you are stuck with 333 MHz Klamath P2.

I have i440FX Slot 1 board, it is OEM design though (Dell). http://hw-museum.cz/mb/30/dell-poweredge-2200 I never tried running anything faster that PII 266 which came with it... and I don't really see the point anyway. i440FX is the slowest chipset by far for Slot 1. In my tests on average 2x PII 233 + i440BX is just as fast as 2x PII 266 + i440FX.

Anyway - PII Klamath is nice match for this board and it will make good retro system.

alvaro84 wrote:

I've seen a Slot1 440FX board toom btw, but it was some proprietary stuff. An EDO RAM P2 would be an interesting test subject, though. And I like the 350 too, if it takes 133MHz FSB it's pretty versatile, ranging from the smallest P2 at 233MHz to slightly above the latest and greatest at 466. For not only Celerons are overclockable 😀

The 440LX also support EDO RAM but EDO DIMMs are kind of rare.

you are stuck with 333 MHz Klamath P2.

Klamath 333 does not exist.

Surprisingly the board is even made by intel!

It's based on their earlier Pentium Pro 440FX board.

PD440FX will only work with Klamath 233 and 266 Pentium II CPUs

Odd why doesn’t the 300mhz Klamath work?

The 300 MHz Klamath and 333 MHz Deschutes will also work in the PD440FX. You need to update to the latest BIOS to support those CPUs. The Intel PD440FX manual spec update explains this and includes the appropriate jumper settings, just like PC Hoarder Patrol posted above. I've tested this personally on my own PD440FX board.

https://downloadcenter.intel.com/download/177 … d?product=50450

Strangest thing of this Intel PD440FX mainboard is, it uses 72 pin contact rams. There isn't much option to use those rams inside a normal ATX case. The worst thing is, it does not have an AGP socket. 🙁

Max divider (corrected multiplier) seems 5 according to the diagram, if there is no upper option like 5,5.

As you know Pentium III processors have SSE but, Pentium II processors do not! To add a Pentium III Coppermine core 1,65 Volt 500 MHz CPU, S370 socket with voltage jumpers on it may provide a 500 MHz Coppermine Pentium III processor to be run at 333 MHz. But, bios modification microcode insertion might be strictly necessary. Pentium II processors works at 2.0 Volt. Some early SECC & SECC2 type Pentium III 500 MHz processors works at 2.0 Volt too, like the one at the link below. It may also work at 333 MHz, but again probably with bios modification.

https://ark.intel.com/content/www/us/en/ark/p … 00-mhz-fsb.html

karakarga wrote on 2024-06-29, 09:38:

Strangest thing of this Intel PD440FX mainboard is, it uses 72 pin contact rams.

i440FX doesn't support SDRAM, this is a chipset from 1995 and EDO was the best you could get then. Some i440FX boards had 168p DIMM slots, but could only accept FP or EDO DIMMs, not SDRAM.

There isn't much option to use those rams inside a normal ATX case. The worst thing is, it does not have an AGP socket. 🙁

Again, i440FX is from 1995, which is two years older than the AGP slot. Intel only released these motherboards because the i440LX was delayed - partly due to the complexity of new technologies like AGP and SDRAM - and they needed *something* that would allow the relase of the P2, even if it was 2 years old and compromised performance. This is the very first slot 1 and indeed P2 board.

Max divider seems 5 according to the diagram, if there is no upper option like 5,5.

Only a 1/2 PCI divider is supported. You are talking about the multiplier. Unless you have an engineering sample, it doesn't matter as the CPUs have locked multipliers and ignore what the board tells them.

As you know Pentium III processors have SSE but, Pentium II processors do not! To add a Pentium III Coppermine core 1,65 Volt 500 MHz CPU, S370 socket with voltage jumpers on it may provide a 500 MHz Coppermine Pentium III processor to be run at 333 MHz. But, bios modification microcode insertion might be strictly necessary. Pentium II processors works at 2.0 Volt. Some early SECC & SECC2 type Pentium III 500 MHz processors works at 2.0 Volt too, like the one at the link below.

'Katmai' is the term you are looking for. There were Katmai CPUs from 450-600MHz. Later Coppermine CPUs were released from 500MHz onwards. You can recognize Coppermine by an 'E' on the end of the model number (i.e. P3-600E). No E? Then it's a Katmai.

It may also work at 333 MHz, but again probably with bios modification.

https://ark.intel.com/content/www/us/en/ark/p … 00-mhz-fsb.html

Not sure BIOS mods for Intel OEM boards are a thing. Definitely Intel BIOS have a whitelist-approach: only known, supported CPUs will be allowed to boot.