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Retro HP Vectra VL 6/333 won't boot with Celeron 333mhz

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First post, by jm764

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Not sure if this is the right forum to post this on, if not just tell me and I'll move it to the correct one.

I have an old (mostly stock) HP Vectra VL 6/333 Desktop that currently has a Pentium II MMX @ 333mhz and I want to upgrade it with a Celeron (Mendocino- Socket 370 with a Slot 2 adapter) at 333 mhz.

Unfortunately when ever I try booting the PC with the Celeron it hangs up at the second boot stage out of 8 on the monitor and wont turn off without a "hard" shutdown.

The adapter the Celeron is attached to has multiple jumpers on it I can change but I haven't really messed with them as they are supposedly already set to automatic config for any socket 370 processor.

The motherboard has a set of switches that controls the cpu speed and is already set to 333 mhz and ranges from 200-366 mhz.

Is there a way I might be able to rig it to work or is the motherboard just too old to accept and adapted processor?

I'll post links and pictures if you need them.

Thank you for the help.
- Jason

Reply 1 of 2, by shamino

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Is that P2-333MHz a Klamath 2.8V CPU? I'm not sure if they made a Deschutes 2.0V version at that speed.

It seems like the multiplier shouldn't be a problem, since both CPU multipliers are the same. I guess you could try changing the slot adapter's jumpers from auto to 5X. However, I think if the multiplier was an issue, it just wouldn't POST at all and you'd see nothing on the screen.

The Vcore setting is probably different between the CPUs, but presumably the auto setting on the adapter will pass through the CPU's requested voltage to the board. Still, you could also try setting that manually. I don't know what the correct voltage is for that Celeron, but it's not as high as a Klamath P2 would have been.

If you push ESC during the boot (before it freezes), does it give any useful messages?

Do you have the latest BIOS for that PC? It might need an update to accept the later CPU.

Reply 2 of 2, by jm764

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It's the Deschutes 2.0V Pentium II.

From what I've gathered its the exact same voltage as the Pent. II for the Celeron.

I'll try that next time I work on it with the Celeron.

Not sure, but I can't really find much info on the PC or motherboard sadly.

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