I thought that a P-3 was the lowest processor that could run XP.

I was wrong.

I have an old Gateway PII 450 that had no problem with SP3.

"Don't pick a fight with an old man.
If he is too old to fight, he'll just kill you."
Posted on 2010-05-18 20:07:26 by skywalker
XP includes HAL even for i486 processor. I doubt any bearable performance without serious strip-down, though.

BTW, mentioned HAL is said to perform faster than its ACPI/APIC/MPS counterparts.
Posted on 2010-05-18 20:47:52 by baldr
BTW, mentioned HAL is said to perform faster than its ACPI/APIC/MPS counterparts.
Is that surprising, considering it's going to not have SMP locking etc?

That said, I wonder if you'd be able to clock a real speed difference on a modern CPU... and obviously it wouldn't support multicore :)
Posted on 2010-05-19 06:11:32 by f0dder
@baldr: It runs on a i486  :shock:  nice :) though it had poor performance on my P 1 at 266Mhz, I'd hate to see its boot time but its still cool that it works.

@skywalker: Yes, I ran XP pro on my Pentium 2, and it surfed the web and everything with it. :D
Posted on 2010-05-23 08:04:51 by Coty
Are you sure it runs on a 486?
I thought XP required some Pentium-specific instructions. (and the same goes for Windows 2000).
Googling also turned this up:
They ran it on a '486' with a Pentium Overdrive.
But with a real 486, they got a boot error, saying it lacked CPUID and CMPXCHG8B.

I've used XP on a PII for a while at any rate.
I've used NT4.0 and 2000 on a Pentium.
I think I also ran NT 4.0 on a 486.
And I ran NT 3.51 on a 386SX.
Posted on 2010-05-24 03:38:09 by Scali
Wow I'm impressed with that. 7Mhz in that one screen-shot? Practically useless though but still impressive  :D
Posted on 2010-05-25 20:36:29 by Coty