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1	(bottom cable)	Ultra/Narrow SCSI cable (SECONDARY SCSI)
2		First Ultra2/LVD SCSI cable
		(PRIMARY SCSI-A)
3		Second Ultra2/LVD SCSI cable
		(PRIMARY SCSI-B, if used)
4		Diskette-drive interface cable (FLOPPY)
5	(top cable)	Backplane board interface cable
		(BACKPLANE)

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System memory resides on a memory module card and consists of a minimum of 128 MB of 72-bit buffered EDO memory. Memory can be expanded up to 4 GB by installing combinations of 32-, 64- (when available), 128-, and 256-MB buffered EDO DIMMs on the memory module.

NOTE: DIMMs must be rated at 50 or 60 ns. With a mixture of 50- and 60-ns DIMMs, system memory will run at 60 ns.

The memory module provides 16 168-pin DIMM sockets divided into four banks, each consisting of four sockets labeled “DIMM A” through “DIMM D” (see Figure 1-8). Memory upgrade guidelines are as follows:

‡DIMMs must be installed one bank (four DIMMs) at a time, starting with bank 1 and working toward bank 4. There should be no open banks between populated banks.

‡Within a bank, install DIMMs in the following order: DIMM A, DIMM B, DIMM C, and DIMM D.

‡DIMM sizes cannot be mixed within a memory bank. However, memory banks can have different DIMM sizes from each other.

‡Of the DIMMs to be installed in the system, install the size you have the most of in the lowest-numbered bank(s), the less numerous size in the next banks, and least numerous size in the highest-numbered banks being used. For example, when installing four 256-MB DIMMs, eight 128-MB DIMMs, and four 32-MB DIMMs, install the 128-MB DIMMs in banks 1 and 2. The 256- and 32-MB DIMMs can be installed in banks 3 and 4; it does not matter which bank holds which size.

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