Under the skirt
Despite its tiny internal volume, the C137 can accommodate a surprising number of internal devices. Sliding off the outer skin nicely opens up the case for component installation, and all the drive bays are easy to remove.
The C137's hard drive tray supports full 3.5" desktop hard drives in addition to 2.5" hard disks. Using a 3.5" hard drive will block one of the case's two full PCI slots, though.
If an optical drive isn't necessary, one can always squeeze a second 2.5" hard drive into the C137 s slim media bay.
The C137 ships with a stack of PCI extensions and riser cards for expansion cards. Having two PCI slots seems a little excessive for a media box, but it's really not. With one PCI slot reserved for a video capture/TV tuner card, a second PCI slot is free for a true 24-bit sound card.
Given the C137's shorter length, PCI cards longer than 8.5" won't fit in the case. Using a standard 3.5" hard drive drops the maximum PCI card length down to six inches.
Just enough power
The Mini-ITX world is dominated by VIA's EPIA line, which doesn't exactly require a lot of power. Still, Mini-ITX boards supporting Socket 478 Pentium 4 processors are slowly becoming available, so the C137 is equipped to power more than just a C3.
The C137 is available two power supply options: a 90-watt model is sufficient for EPIA boards, but there's also a 120-watt model specifically designed for Socket 478 motherboards and Pentium 4 processors. Our sample's 120-watt power supply DC converter resides inside the case, cooled by a single, near-silent fan. The rest of the power supply is enclosed in an external power brick.