The motherboard to get for a pentium is one with an Intel i875 chipset OR the cheaper and nearly as functional i865pe chipset.
Here is the one I just bought at a budget price:
http://tw.giga-byte.com/Motherboard/Fil ... 10_big.jpgAnd here are the Details:
http://tw.giga-byte.com/MotherBoard/Pro ... %20Pro.htmYou WILL need an ATX 2.03 power supply unit for the new pentium mainboards if you don't already have one.
Don't buy a mainboard with integrated graphics if you intend on purchasing an addon graphics card.
These Intel chipsets support 800mhz front side bus speeds and require the CPU which supports that bus speed , (yes, it's a special one: Pentium 4HT, Northwood Hyper Threading).
Also, these two chipsets support DDR RAM which runs
in DUAL CHANNEL mode, so a pair of matching high speed DDR RAM sticks is highly desirable. (PC2700 or PC3200 or faster if overclocking is on the agenda and you have the extra dough!)

Mainboard: Asus P5K-Premium, CPU=Intel E6850 @ x8x450fsb 3.6ghz, RAM: 4gb PC8500 Team Dark, Video: NV8800GT, HDD: 2x1Tb Samsung F3 RAID-0 + 1Tb F3, PSU: Antec 550 Basiq, OS: Win7x64, Display: 24&