Date: Sun, 28 Nov 2004 19:00:35 -0500 From: Chuck Swiger <cswiger@mac.com> To: Adam Fabian <afabian@austin.rr.com> Cc: FreeBSD <freebsd-questions@freebsd.org> Subject: Re: [OT] Re: Is this a sign of memory going bad? Message-ID: <41AA66A3.3090300@mac.com> In-Reply-To: <20041126055038.GA85138@turingmachine.mentalsiege.net> References: <6FC9F9894A9F8C49A722CF9F2132FC220276581D@ms05.mailstreet2003.net> <20041125234948.R27818@april.chuckr.org> <41A6B7CC.90605@yahoo.com> <20041126004912.A27818@april.chuckr.org> <20041126055038.GA85138@turingmachine.mentalsiege.net>
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Adam Fabian wrote: > Does parity RAM reliably report on it's reliability? Nope. At least if you're talking about parity memory on FPM or EDO DRAM, which only has a fifty-fifty chance of even noticing an error, and a 1/9 (~11%) chance of reporting an error with the parity bit itself. Modern SDRAM and DDR memory with ECC will reliably detect and correct single-bit errors, will reliably detect two-bit errors, and even has a very good shot (~90+%?) of detecting larger multibit errors. -- -Chuck
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