IBM 68666AU User Guide - Page 81
Install only ECC RIMMS to enable ECC., Use only PC600 or PC800 RIMMs.
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Page 81 highlights
If the memory card in your computer has eight RIMM connectors, pairs 1 and 3 must have RIMMs or C-RIMMs installed in them. If RIMMs are installed in pair 2, RIMMs or C-RIMMs must be installed in pair 4 for optimal performance. For the arrangement of the RIMM connector pairs on your computer memory card, see the illustration on page 64. Install only ECC RIMMS to enable ECC. If you use ECC and non-ECC memory together, it will function as non-ECC memory. RIMM connectors do not support dual inline memory modules (DIMMs) Use only PC600 or PC800 RIMMs. Note: If you use PC600 and PC800 RIMMs together, all memory will function at the speed of the slowest RIMM. Use the following table to help you to configure memory if you have a memory card with eight RIMM connectors. Memory placement for 8-RIMM Memory Card Pair 4 Pair 2 Pair 3 Pair 1 1 2 3 4 5 6 7 2 RIMMs (1) (1) C-RIMM RIMM RIMM C-RIMM (1) 4 RIMMs C-RIMM RIMM C-RIMM RIMM RIMM C-RIMM RIMM 4 RIMMs* (1) (1) RIMM RIMM RIMM RIMM (1) 6 RIMMs C-RIMM RIMM RIMM RIMM RIMM RIMM RIMM 8 RIMMs RIMM RIMM RIMM RIMM RIMM RIMM RIMM Note: Memory must be installed in matched pairs. * Non-optimal performance configuration (1) These connectors may either be left empty or used to store c-rimms. 8 (1) C-RIMM (1) C-RIMM RIMM Use the following table to help you to configure memory if you have a memory card with four RIMM connectors. Memory placement for 4-RIMM Memory Card Pair 1 Pair 2 3 4 1 2 2 RIMMs RIMM RIMM C-RIMM C-RIMM 4 RIMMs RIMM RIMM RIMM RIMM Note: Memory must be installed in matched pairs. Chapter 5. Installing options 65
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