Memory (RIMM or CRIMM) installation instructions - IBM IntelliStation M Pro (Types 6233 and 6850)

Resolving The Problem

Memory Upgrades
You can increase the amount of memory in your computer by installing memory modules. Your computer has eight connectors for installing Rambus inline memory modules (RIMMs). The IBM-installed RIMMs that come with your computer are ECC (error checking and correction) RDRAM (Rambus dynamic random access memory) modules.

RIMM pairing is as follows:

• Pair 1 includes RIMM 1 and RIMM 2
• Pair 2 includes RIMM 3 and RIMM 4
• Pair 3 includes RIMM 5 and RIMM 6
• Pair 4 includes RIMM 7 and RIMM 8

When installing or replacing RIMMs, note the following:

• The memory board in your computer has eight RIMM connectors arranged in pairs. RIMMs must be installed in pairs. This means that the RIMMs installed in a RIMM connector pair must be the same speed and size, and technology. For example, you can install a pair of 144Mbit, ECC, 400MHz, 128 MB RIMMs in RIMM 1 and RIMM 2 slots. You cannot install a pair that has one 144Mbit, ECC, 400MHz, 128 MB RIMM in RIMM 1 and one 288Mbit, ECC, 400MHz, 256 MB RIMM in RIMM2, or vice versa. When you want to upgrade with another pair of RIMMs, you can install either a pair of 128 MB RIMMs, a pair of 256 MB RIMMs, or a pair of 512 MB RIMMs (as long as they are of the same speed, size, and technologies).
• The memory board in your computer has eight RIMM connectors, pairs 1 and 2 must have RIMMs or continuity RIMMs (C-RIMMs) installed in them.

Installing a RIMM or C-RIMM
Complete the following steps to install a RIMM or C-RIMM:

1. Read the instructions that come with the new system memory.
2. Turn off the computer and all attached devices.
3. Disconnect all external cables and power cords from the computer and remove the computer cover
4. Remove any C-RIMMs that are in the slots where you want to add RIMMs.
5. Touch the static-protective package containing the RIMM to any unpainted metal surface on the computer. Then remove the RIMM or C-RIMM from the package.
6. Install the RIMMs in the next highest numbered RIMM slots.
7. Position the RIMM or C-RIMM above the connector so that the two notches on the bottom edge of the module align properly with the empty connector.
   NOTE: Pay attention to the orientation of the notches on the connectors and RIMMs. Adjacent connectors might not have the same orientation on the memory board.
8. Firmly push the module straight down into the connector until the retaining clips pop up and fit snugly around both ends of the module.
   
9. Place the memory board into the MEC connector on the system board.
10. Replace the PCI adapter retention bracket.
11. Replace the cover.
12. Reconnect the external cables and power cords; then, turn on the attached devices and the computer.