Where can I find a list of the specs for the nForce 420?

Does anyone know what graphics and sound it has?

The nForce 420 is a chipset not a mainboard...
Which brand mainboard are you after?

The sound on the chipset is surprisingly good for onboard sound...
In fact better than the SBLive!
The CPU utilization is significantly lower as well which means your games run faster as less CPU power is lost controlling the sound

The performance of the onboard video isn't amazing but it's respectable...
Its about on par with a GF2 MX400.

Oh right, thanks for explaining.

Heres the system:

AMD Athlon XP2100+ 1.733 GHz 266 MHz bus Socket A (Palomino) prosessor
Cooler Master CPU Fan Socket A/7/FCPGA DP5-7H53F-0C, Up to 1,4GHz and XP2200+
DDR-DIMM PC2100 256MB DDR CL2.5 Generic Memory 184-Pins
MSI K7N420 PRO Mainboard. Socket A, DDR nForce420, ATA/100, ATX, DDR (MS-6373)

Price: €360.

What kind of clock speeds/video RAM would the graphics have?

Not sure...
But I assume the clocks will be around the GF2 MX400 clock speed.
I think you should ditch the idea of a NForce mainboard and just go with a graphics card such as the Radeon 8500 (about 80-100 USD, $200-250 AUD).

The NForce chipset isn't really a top performer either...
In most cases, the KT266A chipset beats it.

nforce420 has geforce2 mx420 onboard i sugest u go for a asus nforce2 deluxe without onboard graphics and get seperate graphics card especially if u r going to use games

Dont go for a Nforce 420 they are very old and not very good anyways.
U can go to TCWO.com and get and EPOX 8RDA+ (NForce 2) for 103$ plus shipping.
Has awesome onboard audio, LAN, Firewire, ATA 133, AGP 8x, and USB 2.0.

Its the best NForce 2 board out there.