The one word that describes Shuttle's SD31P XPC is competent. Just add a hard drive, preferably SATA, optical drive, RAM, and an LGA775 CPU and away you go. Everything works just as it should, and installation is a real cinch for even novice XPC builders. Performance is also good when judged in comparison to ATX-sized i945G and i955X motherboards, and the ability to specify a Pentium 4 Extreme Edition or dual-core CPU, GeForce 7800 GT, 2GB RAM, and 1TByte of storage, should your pocket be deep enough, is eminently possible in this larger-than-normal XPC.