System Board Option # Manufacturing Part # Description Previous Part # X7426A [S] 501-7105 1.28GHz CPU/Memory Module Assembly with 2GB Memory (4× 512MB DIMMS) n/a ?370-4939 29 [C] ?512MB Registered DDR DIMM (SPD 0.0) n/a ?501-6370 [C] ?1.28GHz CPU Board Assembly (N42) n/a ?501-6345 ?CPU Board, 0MB n/a X7436A [S] 501-7106 1.28GHz CPU/Memory Module Assembly with 4GB Memory (4× 1GB DIMMs) n/a ?370-4940 30 [C] ?1GB Registered DDR DIMM (SPD 0.0) n/a ?501-6370 [C] ?1.28GHz CPU Board Assembly (N42) n/a ?501-6345 ?CPU Board, 0MB n/a X7439A [S] 501-7277 1.28GHz CPU/Memory Module Assembly with 8GB Memory (4× 2GB DIMMs) (N42) n/a ?370-7672 ?2GB Registered DDR DIMM (SPD 0.0 or 1.0) PC2100 & faster, L n/a ?501-6370 [C] ?1.28GHz CPU Board Assembly (N42) n/a ?501-6345 ?CPU Board, 0MB n/a X7440A [S] 501-7648 1.593GHz CPU/Memory Module Assembly with 2GB Memory 501-6789 ?501-7649 [C] ?1.593GHz CPU Board Assembly, 0MB n/a ?501-6778 ?CPU Board, 0MB (N42) n/a X7441A [S] 501-7650 1.593GHz CPU/Memory Module Assembly with 4GB Memory 501-6786 ?501-7649 [C] ?1.593GHz CPU Board Assembly, 0MB n/a ?501-6778 ?CPU Board, 0MB (N42) n/a X7442A [S] 501-7651 1.593GHz CPU/Memory Module Assembly with 8GB Memory 501-7093 ?501-7649 [C] ?1.593GHz CPU Board Assembly, 0MB n/a ?501-6778 ?CPU Board, 0MB (N42) n/a n/a 501-6786 1.593GHz CPU/Memory Module Assembly with 4GB Memory (4× 1GB DIMMs) (N42) n/a ?370-7671 ?1GB Registered DDR DIMM (SPD 0.0 or 1.0) PC2100 & faster n/a ?501-6788 [C] ?1.593GHz CPU Board Assembly (N42) n/a ?501-6778 ?CPU Board, 0MB (N42) n/a n/a 501-6789 1.593GHz CPU/Memory Module Assembly with 2GB Memory (4× 512MB DIMMs) (N42) n/a ?370-7670 ?512MB Registered DDR DIMM (SPD 0.0 or 1.0) PC2100 & faster n/a ?501-6788 [C] ?1.593GHz CPU Board Assembly (N42) n/a ?501-6778 ?CPU Board, 0MB (N42) n/a n/a 501-7093 1.593GHz CPU/Memory Module Assembly with 8GB Memory (4× 2GB DIMMs) (N42) n/a ?370-7672 ?2GB Registered DDR DIMM (SPD 0.0 or 1.0) PC2100 & faster, L n/a ?501-6788 [C] ?1.593GHz CPU Board Assembly (N42) n/a ?501-6778 ?CPU Board, 0MB (N42) n/a n/a 540-5285 CPU/Memory Board Cage Assembly n/a n/a 540-5919 [C] Motherboard Assembly/CRU n/a ?501-6344 27 ?Motherboard (N42) n/a ?501-6910 28 ?Motherboard (N42)