No, but that doesn't stop them quoting estimated ones ;) Intel's
document extrapolates quoted soft error rates by RAM manufacturers
into MTBF, anyway.
As Alan Cox said in a previous message, Intel may be right that soft
errors (alpha particle corruption etc) are that rare these days, but
their calculations are ignoring all other sources of error, including
manufacturing defects.
Intel also have a vested interest in convincing us that parity isn't
needed, since they decided not to use it in their popular Triton
chipsets.
I don't think that parity gives you that much protection, though, so
I'm not convinced that it's worth seeking out systems that support it.
ECC may be a different story.
-Matt