Well, the 300mhz ones I have don't accept any multiplier other than the default, same as the later PII/PIII chips.
That is unfortunate...did they produce these klamath's after week 34 1998 or something?
Come to think of it, I don't know if that Compaq will take a Klamath. They're not really known for wide ranges of CPU support in their boards, and it wouldn't surprise me a bit if they dropped support for the older cores in order to save a few cents on the voltage regulator and such.
A 266mhz Deschutes would probably work fine, though, if you can find one. It was step code SL2W7, if I remember correctly.
I never tried it but shouldn't a compaq slot-1 board be prepared to take a slot-1 celeron with 66MHz FSB? Either way an OEM mainboard usually lacks all the fancy tweaking options.
Don't just take any 266 or 300MHz Deschutes model, if core stepping is dB0 it will certainly be completely multiplier locked. I think the 333MHz is the easiest Deschutes for underclocking, many of these are stepping dA0, dA1 should also be OK, but I am not 100% sure about dA1. I have a SL2QF with dA0 stepping and it takes multiplier 2.0x to 5.0x, it also works fine on a 100MHz FSB. (but again, no L2 cache at multiplier 2.0x and 2.5x)
If you can get a Klamath cheap, why not try it...
Sounds like it's best to stick with the 233 or 266 CPUs to make sure it's unlocked.
I intent to try a klamath, but I will be going abroad next week already... so me should either hurry or postpone it. I have this Aopen mainboard with a 1.5x multiplier option, maybe it works for klamath CPU's.
hmm, 233/266 seems the safest choice indeed. But is there any other indication such as stepping or manufacturing date? E.G. which product numbers are verified to be locked/unlocked/limited?