from what I can see wtih similar spec mainboards it appears to be like below. but to be 100% sure need the mainboard manufacturer and model number this is somtime displayed at post boot at the bottom of the screen. can you take a picture of your post boot screens?
Chipset:
VIA P4M266A (Northbridge)
VIA VT8235 (Southbridge)
System clock: 533/400MHz Socket 478 CPU Support
Intel Pentium 4 processor and Celeron for socket 478
with 533 or 400MHz FSB
Hyper-Threading-Support
MV43VN and MV43PN: no Prescott support
MV43VN v8.1a: supports Prescott 2.4 and 2.8GHz Expansion Slots:
1 x AGP (v2.0) slot supports 4X mode
Important Note: AGP-slot supports only 1,5V-mode
2 x 32 Bit PCI (v2.2) MV43PN and MV43VN
3 x 32 Bit PCI (v2.2) MV43VN v8.1a
1 x CNR-slot