Memory
Option #	Manufacturing Part #	Description	Previous Part #
X7403A [S]	1GB DDR Memory Option (2 × 512MB DIMMs)
X7403A [S]	370-4939 ⁴ [C]	512MB Registered DDR DIMM (SPD 0.0)	n/a
X7404A [S]	2GB DDR Memory Option (2 × 1GB DIMMs)
X7404A [S]	370-4940 ⁵ [C]	1GB Registered DDR DIMM (SPD 0.0)	n/a
X7603A [S]	1GB DDR Memory Option, SPD 1.0 (2 × 512MB DIMMs)
X7603A [S]	370-6202	512MB Registered DDR DIMM (SPD 1.0)	n/a
X7604A [S]	2GB DDR Memory Option, SPD 1.0 (2 × 1GB DIMMs)
X7604A [S]	370-6203	1GB Registered DDR DIMM (SPD 1.0)	n/a
X7703A [S]	1GB DDR Memory Option, SPD 0.0 or 1.0 (2 × 512MB DIMMs)
X7703A [S]	370-7670	512MB Registered DDR DIMM (SPD 0.0 or 1.0) PC2100 & faster	n/a
X7704A [S]	2GB DDR Memory Option, SPD 0.0 or 1.0 (2 × 1GB DIMMs)
X7704A [S]	370-7671	1GB Registered DDR DIMM (SPD 0.0 or 1.0) PC2100 & faster	n/a
n/a	540-6229 [C]	1GB DDR FRU, SPD 1.0 (2 × 512MB DIMMs)	n/a
n/a	370-6202	512MB Registered DDR DIMM (SPD 1.0)	n/a
n/a	540-6230 [C]	2GB DDR FRU, SPD 1.0 (2 × 1GB DIMMs)	n/a
n/a	370-6203	1GB Registered DDR DIMM (SPD 1.0)	n/a
n/a	540-6400 [C]	1GB DDR FRU, SPD 0.0/1.0 (2 × 512MB DIMMs)	n/a
n/a	370-7670	512MB Registered DDR DIMM (SPD 0.0 or 1.0) PC2100 & faster	n/a
n/a	540-6401 [C]	2GB DDR FRU, SPD 0.0/1.0 (2 × 1GB DIMMs)	n/a
n/a	370-7671	1GB Registered DDR DIMM (SPD 0.0 or 1.0) PC2100 & faster	n/a

⁴ FRU F370-4939 contains two 512MB DIMMs.
⁵ FRU F370-4940 contains two 1GB DIMMs.
NOTE: Reference the Open Boot PROM requirements for your system.
NOTE: Always swap out memory DIMMs in pairs. Ordering new memory as either X-options or CRUs should guarantee that two matched DIMMs are available for installation.

Table Legend
[F] = Field Replaceable Unit (FRU) [C] = Customer Replaceable Unit (CRU) [S] = Supported, but can no longer be ordered with this system [N] = No longer supported for this system Price = Price this Part