Lenovo P520 BD0331 ATX motherboard. Does not come with a CPU or RAM. Uses Intel LGA-2066 socket and originally had a Xeon W-2135 CPU. It has 8 ram slots for DDR4 ECC memory with max memory of 512 GBs. Has 2 gen 3 M.2 slots. These motherboards used a hot-swap PSU so I strongly suggest making sure you research if this motherboard will work for you. Preferably used in another Lenovo ThinkStation. Don't be afraid to shoot an offer.