[time-nuts] 5070B once more.... (actually 5370A fans)
magnus at rubidium.dyndns.org
Fri May 22 22:02:52 UTC 2009
Mark Sims skrev:
> The power dissipated in a modern CPU chip (watts per sq cm) far exceeds that of a cooking hotplate. There are some videos on YouTube showing CPU's literally exploding when they loose cooling for just a short time. ECL is a rather chilly iceberg in comparison...
The Cray-1, where the core is ECL only, uses the board ground plane to
connect out to the mountings which is infact cooling walls called cold
bar. They had problems to manufacture those in aluminium to hold the
circulating freon properly.
The power was fed to the supplies under the seats in 12-phase 400 Hz AC
(12 phases after transformer, 3 phases from power-converter) such that
after rectifying only very little filtering is needed to kill the
ripple. While the hungriest modules was consuming 65 W, density wise a
modern CPU puts it to shame.
The Cray-3 on the other hand... the modules was just bathing naked into
More information about the time-nuts