Buggy AMD CPUs

Hans Åberg haberg-1 at telia.com
Tue Nov 7 20:49:36 UTC 2017

> On 6 Nov 2017, at 22:20, Torbjörn Granlund <tg at gmplib.org> wrote:
> 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.

Some issues are discussed here:


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