Here is someone's settings for a P4 1.5cpu, so adjust accordingly..
Motherboard: Abit Abit TH7II 
Chipset: i850 
RAM: 512 MB RDRAM 
Processor: Pentium 4  
CPU Speed: 1.5 GHz 
Socket/Pkg: Socket 423 / OEM 
Overclocking 
OC Speed: 1.99492 GHz 
OC Bus: 531.98 MHz 
OC Voltage: 1.76 
Cooling: CoolerMaster 
Compound: Artic Silver III 
Result: Overclocking Successful! - No problems at all (over many hours/days). 
OS: Windows 2000 pro 
Graphics Card: Nvidia geforce3 
Driver Version: .4 23.11 
Video Memory: 64 MB 
DirectX Ver: 8.1 
Benchmarks 
3DMark 2001: 9003 
Sandra 2001: 3997 MIPS 
3DMark 2000: 9934 
Full comment:
pentiumIV Socket 478 1.5 @ 2.0 gHz 
Sony 16x40x DVD 
Plextor 16x10x40x CDR/RW 
S.B.live 5.1 
IBM 40gb Deskstar 7200rpm ATA100 
(2) Adaptec 29160 Dual Channel SCSI controllers 
(2) Seagate Cheatah X15 18.35gb 15000 rpm (raid 0) 
Visiontek GeForce3 @ 249/530 
VooDoo3 3000 pci (multi-monitor) 
intel Pro/100 nic 
Antec 1030B SOHO Case 
DigitalDoc 5 
Sparkle 400w P.S. 
(7) Sunon 80mm 33cfm Fans 
Immaculate Wiring 
H.E.P.A. intake filtering