What I assume is the motherboard (biggest board, has all the other stuff plugged in. Gold) has soltek written on it (I recognised the name). The big chip has nForce2 written on it. The only other numbers of note on the board are, SL-75frn2-L, on a connector, don't suppose that's it and t328041A (that one has a strange A. something under it written upside down)
silly me , totally forgot I had the origianl box under my desk. It says nForce2 Ultra 400. There is also a sticker saying fsb400, AGP 8x Dual channel DDR 400.
What do you know, the box had a couple of manuals. seems SL-75FRN2 was important. There's a manual which boldly says soltek and that number.