Buggy AMD CPUs

Torbjörn Granlund tg at gmplib.org
Mon Nov 6 21:20:55 UTC 2017

Last spring, I purchased an AMD Ryzen processor for GMP optimisation
work.  It crashed frequently, but I attributed this to poor quality RAM.
I then replaced the old RAM with server grade Samsung ECC RAM.  The
problem persisted, and I switched the system off.

Later, it turned out that the Ryzen CPU was buggy.  AMD decided to NOT
recall broken CPUs NOR make a full and unambiguous disclosure about the
issue.  They offered to replace CPUs on a case-by-case basis, while
inventing the newspeak term "performance marginality issue" for the bug.
But I decided it was not worth the time to go through AMDs tribulations.
I however turned on the GMP Ryzen system but made the GMP test system
aware of the broken hardware (this makes it retry everything thrice).

Today, I decided to purchase a new Ryzen and simply bin the old one,
again to save time.  But to my utter surprise, AMD still sells the old
broken CPUs and I was unlucky enough to get one of those.

Two broken AMD Ryzen CPUs.  USD 800 less funds for GMP work.  Thanks

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