The PCX-500 and PC-K1 are both Lian Li cases, but they have completely different form and functionality.  The PCX-500 is very tall, 23″ but only 9″ deep and 15″ long, which forces a rather unique technique to install the optical drives.  The PC-K1 has more standard dimensions, it’s special feature is it’s very lightweight design.  That can come in very handy if you use the case for LAN parties.  Check out their other features at Extremetech.

“Today we look at a pair of cases. First up is the Lian Li PC-X500, also known as the Tyr PC-X500, which is the most unusual. The PC-X500 is a tall tower, but less deep than most, in order to fit into a tighter floor footprint. Achieving that goal required some interesting design decisions, such as the sideways-mounted optical drive bays.

Lian Li suggests that the PC-X500 might be a good case for a home theater PC, sitting unobtrusively alongside that HDTV. Alternatively, it could be a good case for gamers. It is not, on the other hand, inexpensive at $400.

The PC-K1 is a more conventional tower case, aimed squarely at gamers. Built in a steel skeleton with an aluminum skin, the PC-K1 is more rigid than most all-aluminum cases, but substantially lighter than a purely steel design. Both cases are unusual enough that we built entire systems into them to get a better feel for how easy these cases are to work with, and how well they integrate into a home environment.”

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