IBM 8688 manual Installing memory, Pair Dimm connectors Port

4.Using the tab, pull the CD-ROM or DVD-ROM drive partially out of the server; then, grasp the drive and remove it from the server.

5.If you have other options to install or remove, do so now. Otherwise, connect the external devices and power cords and turn on the server.

Installing memory

The following notes describe the types of dual inline memory modules (DIMMs) that your server supports and other information that you must consider when installing DIMMs:

vYour server supports 512 MB, 1 GB, and 2 GB DIMMs, for a maximum of 40 GB

of system memory. Your server supports up to twenty-eight 2.5 V, 184 pin, PC2100, ECC DDR SDRAM, 133 MHZ DIMMs. Go to the ServerProven® list at http://www.ibm.com/pc/compat/ for a list of memory modules you can use with your server.

vYour server supports a maximum of only 20 DIMMs (10 per port) if any connector contains a 2 GB DIMM. Your server supports a maximum of 28 DIMMs (14 per port) if only 512 MB and 1 GB DIMMs are installed.

vYour server comes with a minimum of two 512 MB DIMMs, installed in slots 1 and 14. When installing additional DIMMs, you must install two DIMMS at a time, in the order shown in the following table to maintain performance.

Table 8. DIMM installation sequence

Pair	DIMM connectors (Port 1)		Pair	DIMM connectors (Port 2)
1	1 and 14		2	15 and 28
3	4 and 11		4	18 and 25
5	2 and 13		6	16 and 27
7	5 and 10		8	19 and 24
9	3 and 12		10	17 and 26
11	6 and 9		12	20 and 23
13	7 and 8		14	21 and 22
		Port 1	Port 2

DIMM error LEDs

are built into each handle

vEach DIMM in a pair must be of the same size and technology to ensure that the server will operate properly.

98IBM xSeries 450 Type 8688: Hardware Maintenance Manual and Troubleshooting Guide