Board is made by quanta with model number qcg34/38 on board. Drives are 3 1/2 inches. There are over 100 chips some numbers are 8618,8627,8705,8635, a lot are 8719. Bear, if you were any closer to Wisconsin I would ship you one for nothing as I got 2 for free, problem is they weigh 45 lbs. On the back, there are 2 in and four out. This came from a television station if that helps any.