They need an optional fourth "cube" to enclose an AT-style PSU
with a separate ON/OFF switch. This will solve a few problems
e.g. no need for extension cables when the cubes are separated,
as in the photo with a monitor in between; and, some of us
would like to house ramdisks like the ACARD ANS-9010
in an external enclosure, and power the volatile RAM
with a second PSU that does not switch OFF when
the OS is shutdown.
One more idea: we connect a Highpoint RocketRAID 2322
with multi-lane "Infiniband" cables which like to mate via
either an empty PCI slot, or empty SCSI slot: I don't know
how long those multi-lane cables are, at present.
MRFS