I have a AMD Sempron 2800+ processer on a nVidia nForce 2 Ultra 400 motherboard. Is this any good? How good is it compared to the Pentium and Celeron?

It's decent. Beats the Celerons, but loses to p4's; however, you didn't spend nearly the money the p4 cost.

Learn how to overclock it! ;-)

"...but in my defense, it was dark, I was drunk, and it was delicious!"

best socket A would be the mobile athlon xp because it is the best overclocker and produces not much heat.

Mr X

"best socket A would be the mobile athlon xp because it is the best overclocker and produces not much heat"

I agree with this statement, but I wanna add that to get the most out of an XP-M on a desktop machine, you need a board that supports overclocking...that is, full adjustemnts to FSB, multiplier, voltages, etc

Asus A7N8X-X
1800+ @ 8 x 210MHz
512MB PC3200
Asus Ti4200 128MB
WinME/WinXP Pro

"you need a board that supports overclocking...that is, full adjustemnts to FSB, multiplier, voltages, etc"

I concur, you also need a reliable PSU with enough amp distribution on the 12V rail and some PC3200 memory for best results.

B4 you criticize a bigger man, walk a mile in his shoes. That way, you're a mile away, and you have his shoes.

"I concur, you also need a reliable PSU with enough amp distribution on the 12V rail and some PC3200 memory for best results."

i concur what you concurred to

Abit AS8 LGA775 2.8 @ 3.36
2 x 512 Geil Ultra Platinum PC4000 @ DDR480
128 meg Radeon 9800 Pro
DUAL 36 GIG WD Raptors RAID0
21 in. 19.8 viewable Sony Trinitron
4 Mbps cable connectio