This is an ultra rare PB600 (PB600J) board! It is considered rare as it has L2 cache modules (see picture) which was a rare option from the factory. I believe it is comparable to the Packard Bell part number BPCS: 181002. It was sourced from a Japanese Packard Bell Force desktop unit. It is fully functional and has a VRAM upgrade as well. These boards are hard to come by these days and will be a nice suitable replacement or upgrade for your Packard Bell system or even custom build! As always there are no returns and good luck! Thanks for looking!