Nothing much. A Celeron 433mhz, 64mb pc100 ram, and ATI Rage LLC on board graphics. I splurged and got a Soundblaster SB0090 that pairs nicely with the high quality sounding speakers. Set this piece up in my living room and use it for music and as decor. It was using a Rage 128 Pro card for like 20 minutes but the card hit the hay, and 2 more cards later and I've yet to get lucky and get a working card lol. Anyway, it has windows 98SE and an 80gb 5200rpm Seagate drive, all in all I've invested a little over 80 bucks into the system since most of it was acquired at goodwill LOL.