Memory Option # Manufacturing Part # Description Previous Part # X7056A 14 4 GB (4 × 1GB SDRAM DIMMs) 501-7386 [F] 1GB SDRAM DIMM, L 501-6109 [F] X7051A [S] 2 GB (4 × 512MB SDRAM DIMMs) 501-7385 [F] 512MB SDRAM DIMM, L 501-5030 [F] + 540-5085 X7053A [S] 1 GB (4 × 256MB SDRAM DIMMs) 501-5401 [F] 256MB SDRAM DIMM 540-5084 n/a 501-5030 [F] 512MB SDRAM DIMM 540-5085 n/a 501-6109 [F] 1GB SDRAM DIMM n/a n/a 540-5086 [F] 1GB SDRAM DIMM n/a n/a F511-1030 10 [F] Package of 25 × 512MB SDRAM DIMMs n/a ?501-7385 [F] ?512MB SDRAM DIMM, L 501-5030 [F] + 540-5085 n/a F511-1031 12 [F] Package of 25 × 1GB SDRAM DIMMs n/a ?501-7386 [F] ?1GB SDRAM DIMM, L 501-6109 [F]