[Beowulf] Node Drop-Off
James.P.Lux at jpl.nasa.gov
Mon Dec 4 13:09:09 EST 2006
At 07:15 AM 12/4/2006, Tim Moore wrote:
>Update to node drop-off:
>The AMD engineer with whom I talked was amazed that such CPUs made
>it beyond quality control. He also suggested that the vendor may
>have inadvertently mixed returned (previously fetermined to be
>flawed processors) with the new ones and sent them out (again) as new.
>Just for future reference...is there an easy way to determine if a
>CPU is flawed with 2 weeks of down time and extensive hair extraction????
This has been a persistent problem in the industry for decades. It's
not unheard of for wholesalers to get batches of processors that have
been remarked somewhere along the line. They'll run at the speed at
room temp, but not over the entire temperature range, or, maybe with
some bus loading conditions. Obviously, the mfrs hate it when this
occurs, and so, they've been doing things like making the speed grade
readable from some built in ROM or as a bond wire option.
And, as much as the mfrs hate it, there's always the "fell of the
back of the truck on the way to the disposal company" problem.. parts
that don't pass the mfr inspection are supposed to be destroyed, but
Processors are a high dollar item for something quite compact,
they're sort of commodity (at least as far as the end user is
concerned), so they're ripe for all the fiddles that have been used
on such items for millenia. Hey, didn't Archimedes get famous for
devising some sort of test along those lines?
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