| C9900-R291 | 128 GB DDR5-RAM ECC, 8 RDIMMs of 16 GB, uses 4 of 8 DRAM channels per CPU |
| C9900-R292 | 256 GB DDR5-RAM ECC, 16В RDIMMs of 16В GB, uses all 8В DRAM channels per CPU |
| C9900-R293 | 384 GB DDR5-RAM ECC, 16В RDIMMs of 24В GB, uses all 8В DRAM channels per CPU |
| C9900-R294 | 512 GB DDR5-RAM ECC, 16В RDIMMs of 32В GB, uses all 8В DRAM channels per CPU |
| C9900-R295 | 768 GB DDR5-RAM ECC, 16В RDIMMs of 48В GB, uses all 8В DRAM channels per CPU |
| C9900-R296 | 1024 GB DDR5-RAM ECC, 16В RDIMMs of 64В GB, uses all 8В DRAM channels per CPU |






