[Beowulf] AMD Roadrunner open compute motherboard

[Mark Hahn]

> As in contradiction to what Mark Hahn says - it needs active cooling.

if anyone cares: a dimm dissipates roughly 2W, depending on generation,
whether it's LV, number of devices, etc.  one of those duplex 14krpm fans 
is typically rated at about 12W.

in a mainstream server, each CPU will dissipate around 100W.
typical SATA disks, about 5W.  since servers normally have "platinum"
plus80 ratings these days, the PSU would need to dissipate ~30W.
NICs are normally <= 8W.

so even a 1W device needs some airflow, but it's mostly CPUs that count.