I use Asus mother boards, but the Abits also use what is called jumperless settings. You set the CPU clock and memory bus speeds through the bios. There's several newsgroups and web sites that specialise in how to do it. You can ask board specific questions, and get replies within hours. One such site is Overclockers.Com.
I've overclocked both Pentium and AMD chips, and the AMDs are by far the best performers. You can realise performance gains of 33% quite easily. I've had my T-bird 800 running at 1 GHz rock solid stable for over a year, and a 1 GHz T-bird running at 1.33 GHz for nine months.
The two biggest enemies in overclocking are heat (hence the need for a good heatsink/fan) and flakey cheap memory modules.
Finally, you'll need a good motherboard monitor. Most of the ones that come with the motherboard are inaccurate. MBM, which can be downloaded here, is probably the best. It's also free.
Case:
Lian PC-68 with front USB out.
Monitor:
Sony CDP-G520 21”.
Power Supply:
Enermax 468W with two cooling fans.
Motherboard:
ABIT TH7II-RAID (I850 chipset) Dual channel RD-RAM.
CPU:
Pentium-4 2.0GHz Micro PGA (socket 478). (with stock INTEL CPU cooler and fan)
RAM:
Four 512Meg RDRAM-800 memory sticks. (2Gbytes RAM).
Video Card:
Geforce3 Titanium 500.
Sound Card/System:
Sound Blaster Audigy Platinium with both optical and Firewire I/O linked to a DENON Surround sound processor (with optical in) and 5 speakers with an additional subwoofer.
USB Card:
USB 2.0 four port USB card.
SCSI Card:
160 Ultra wide 4 port SCSI card.
Hard Drive:
Two Western Digital WD-1200 7200 rpm 8Meg cache 120Gbyte hard drives. (stripe 0)
DVD:
Pioneer DVD-106S 16X DVD.
CD-RW:
Plextor Plexwriter 24/10/40A.
Floppy Drive / Drive “B”:
Generic 1.44 and an LS-120 (120Mbyte floppy).
Ethernet Card:
Netgear 10/100 ethernet card.
Mouse:
Logitech optical wheel mouse.
Game Pad:
Logitech Wingman Rumble Pad.
Joystick:
Logitech Extreme Digital 3D Joystick.
Keyboard:
Microsoft Natural Keyboard Pro.