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Mixed parity

By jfreedma ·
Is it possible to use Parity SIMM's in a Non-Parity environment?

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Mixed parity

by Some Guy in Seattle In reply to Mixed parity

You can try it, the worst you'll get is a series of POST beeps during bootup. It shouldn't hurt your PC otherwise. On the whole, though, I don't think so because the the SIMMs are setup to receive access requests for parity checks during normal RAM usage. If no requests are made the SIMM may not operate properly.

Historical note: even if it does work, you may not want to, or you may get random unexplained errors. Parity SIMMs were designed when RAM was unreliable in its memory storage.If the manufacturers went to extra lengths to add the hardware (extra chip and wire traces) on the SIMM then that means they aren't entirely convinced it's going to work properly every time. Current manufacturing standards are able to produce RAM that has no need of parity checking.

Hope that helps -

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Mixed parity

by jfreedma In reply to Mixed parity

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Mixed parity

by GuruOfDos In reply to Mixed parity

Yes....historically, parity was used as error checking on older systems, but if you treat it purely and simply as 9,18 or 36 bit memory width, as opposed to non-parity's 8,16 or 32 bit then there's no functional difference. Non-parity memory slots don't actually connect to the parity pins on a parity SIMM. You CANNOT however use non parity RAM in parity slots as it has a 'bit missing'. Parity memory is hellishly expensive in 72pin FPM at the moment. Parity memory is around 4-5x the price of regular non-parity.

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Mixed parity

by jfreedma In reply to Mixed parity

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by jfreedma In reply to Mixed parity

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