flakes wrote:

Hi

You havent by mistake got one of the first P3 450MHz chips? if so they are a bit different and the bios may be upset. I had this issue when going from a P2 400 to P3 550. Board had issues like this until i found a BIOS update. (HP oem version of an ASUS board). After the BIOS it took an 800MHz on a slotkit.

Nope, definitely P2 450. BIOS recognises it correctly with the 4.5x jumper setting.

Errius wrote:

moawkwrd wrote:

I don't have a fan to install though. You can see in the pics above that the heatsink isn't designed for a fan to be attached and there seem to be an awful lot of slot 1 Pentium 2s and 3s with those style heatsinks without fans, I can't imagine they all need fans somehow attaching to work. A quick search on here suggests plenty of people use them without fans. It just seems faulty, temperature related or not.

Some OEM systems have the CPUs inside a fan duct that pulls air across the heatsink and out the back of the case. Corporate/server machines often did this. A lot of the fanless CPUs you see on eBay were intended for these systems, and will run too hot if put in a regular case without additional cooling.

As said earlier it does have a 120mm directly above it as the PSU is relatively new. I used to have a Gateway with a P3 500MHz with a similar plastic shroud and only a heatsink on the CPU with an 80mm fan of the PSU for airflow and never had any temperature problems - it's heatsink was considerably smaller than this has also.

meljor wrote:

Try and disable l2 in bios. It will be much slower but if it is stable like that it's probably the l2 cache that's bad.

That cpu needs a bit of cooling though...

Will give it a go if I can find the setting, thanks. Still waiting for the seller to respond to the return request.

that CPU is a dud, thats unfortunate. hopefully you get a refund from the seller.

Have you checked for bulging capacitors on the motherboard?

However, I've swapped it over today and it's causing all sorts of errors - memory problems, graphics distortions, system hangs, CMOS errors, etc.

Try to clean the contacts. Few Pentium II/III in my collection required cleaning to just work.

The Serpent Rider wrote:

However, I've swapped it over today and it's causing all sorts of errors - memory problems, graphics distortions, system hangs, CMOS errors, etc.

Try to clean the contacts. Few Pentium II/III in my collection required cleaning to just work.

Did this today, and also attached a fan to the heatsink, still no luck. Oh well - I got my money back from the seller. Will look out for another cheap one to try.

tegrady wrote:

Have you checked for bulging capacitors on the motherboard?

Not a problem - motherboard is great with the Pentium II 350.

So I got hold of another Pentium II 450 - works fine first time after changing the jumpers!

One question though - it looks to have a third party heatsink/fan with an additional 2 pin connector - does anyone know what it's for?

Probably a second redundant 2-pin connector for a situation where you only would have a 2-pin connector available on the motherboard. Sometimes they are so tightly packed that using a 3-pin cable on a 2-pin connector is just not possible, space-wise. The sense pin is not needed per se on these as the temperature is monitored by a sensor below the CPU and the fan speed is slightly adjusted by the voltage.