A DAY AFTER Intel released five LGA 775 chips, the firm reported a list of bugs in its Pentium 4 Prescott produced at 90 nanometres. The report, dated 22nd of June 2004, show some interesting examples of erratanotbugs. For example, R9 is described as "System bus interrupt messages without data which receive a hard failure response may hang the processor".
So far no workaround is available for this bug. R16 describes a system hanging as a result of a fatal cache error, while R19 describes a parity error in the L1 cache which could cause the processor to hang. There's no workaround for this one yet, in this stepping.
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News source: The Inq