Memory Option # Manufacturing Part # Description Previous Part # X7800A [S] 1GB (2 × 512MB DDR2) Memory Expansion Kit, 370-6207 [C] 512MB DDR2 DIMM, 533 MHz, n/a X7801A [S] 2GB (2 × 1GB DDR2) Memory Expansion Kit, 370-6208 [C] 1GB DDR2 DIMM, 533 MHz, n/a X7802A [S] 4GB (2 × 2GB DDR2) Memory Expansion Kit, 370-6209 [C] 2GB DDR2 DIMM, 533 MHz, n/a X7803A [S] 8GB (2 × 4GB DDR2) Memory Expansion Kit 370-6210 [C] 4GB DDR2 DIMM, n/a