Model 90 Memory Riser Card

provides a redesigned memory riser for 8590 systems to eliminate parity errors caused by dissimilar memory SIMMs.

Machines affected:
all 8590 systems

Physical check:
inspect the memory riser for FRU p/n 33F4905

If memory riser card FRU p/n 33F4905 is populated with mixed SIMMs and any of the following errors occur:

then replace both memory risers with FRU p/n 81F8823.

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