The reason people say that the 2.8 is faster when OCed than the 3.0 is not because you can get it to higher clock speeds, but rather that at the same clock speed the 2.8 will have a faster bus than the 3.0, for example: to get a 2.8 (14x multiplier) to 3.4GHZ you'd need a 243MHZ FSB, the 3.0 would only need a 226MHZ FSB. The P4 is always thirsty for more bus bandwidth, the problem is that you also need fast RAM that would also be at the same speed (DDRRAM is double the speed of the bus).
I have a P4 2.4GHZ and just ordered OCZ PC4200 Performance RAM which runs at 533MHZ so I'd be able to increase the FSB to 267 and with a multiplier of 12 I'd get 3204MHZ, and that's without overclocking the RAM (which I intend on doing).
Got a nice overclocked overvolted system to keep you warm at night? That's great. Guess I'll have to settle for a woman...
well after going through 15 or so pages worth of topics in this forum alone i've decided i'm probably gonna go with either a 2.8 with water cooling or a 2.6 with air cooling, i'm leaning towards a 2.8 with water cooling and PC4000 corsair or OCZ (if i can get it in australia damn hard to find) memory. Not sure wether to build my own water cooling system and save a heap of money or buy a complete one for 400AUS. I've never done water cooling before (or any overclocking for that matter) but i've been doing days worth of research (over 12 hours worth just today) and there seems to be some reasonably straight foward very detailed step by step instructions out there how to do everything so i don't see why i can't do something complicated just by copying someone else ^_^, we'll see how long till my brand new CPU fry's ^_^
"Human beings, who are almost unique in having the ability to learn from the experience of others, are also remarkable for their apparent disinclination to do so."
Douglas Noel Adams 1952-2002