2022-04-02 More power and less power
Since the last update, all nodes have been upgraded to a 16-core
configuration. The 3900Xs, after long and meritorious service, have
all been retired. They are replaced with 5950Xs.
Also, summer is now approaching, and the machines are in an
un-air-conditioned garage. It is fortunate that the garage is on the
side of the house which receives the least amount of sun every day,
but still it will get very warm in there. In an effort to continue
24/7 crunching through the summer I will be adjusting PPT limits
downward to try to keep things acceptibly cool.
My first adjustment was made today by reducing the PPT of all nodes to
65W – not the AMD Eco Mode “65W”, which is really 88W, but an actual
hard cap of 65W package power use. I’ll let this ride for some days
(at least until it warms up a bit later in the week) to see what sort
of steady-state temperatures and average CPU clocks are reached.
For later comparison, with PPT set to roughly 85W, steady-state temps
were around 70-72C most of the time, and pushing north of 75C in the
For older news, check out our 2021 updates.