First off, if you don't need the speed, don't OC it. Secondly, that system is sooo old I don't even know how well it'll OC (gotta ask the gurus here). Thirdly, it's not like stock HP power supplies are good at OCing. Fourthly, your BIOS may not even support OCing.
If your PSU can handle it, then consider moving the RAM divider to 1:1 or something like that to up the CPU frequency. This will require you to increase the Vcore voltage for the CPU.
I would also advise backing up your files in case it all goes south (in case you OC it too much)
And oh, I should add that OCing is the antithesis to making your PC last longer.
also as a side note.. that P4 1.6 is probably the goat intel designed that performed WORSE than the PIII. That family of cpu was poor at Over Clocking. Williamette based P4's have 256KB L2 cache and the Northwood P4's have 512KB in their L2.
The Willamette's SUCK.. so it's a waste to even consider.. sorry.
100 fsb is the frequency of your Motherboards transport. Ram runs on it verbatim.. Pentium runs 4 times that..hence 100 x 4 = 400 That's a clock speed internal to the processor only. willamette explainedComputer stuff, explained