|  | 
| Memory |  
| Option # | Manufacturing Part #
 | Description | Previous Part #
 |  
| X5110A | 540-7714 [C] | 8GB (2 × 4GB) Memory FRU, | n/a |  
|  | 4GB Registered ECC DDR2-800/PC2-6400 DIMM, 
 | n/a |  
| X6381A  Price | 540-7347 [C] | 4GB (2 × 2GB) Memory FRU, | n/a |  
|  | 2GB Registered ECC DDR2-667/PC2-5300 DIMM, 
 | n/a |  
| X6382A  Price | 540-7348 [C] | 8GB (2 × 4GB) Memory FRU, | n/a |  
|  | 4GB Registered ECC DDR2-667/PC2-5300 DIMM, 
 | n/a |  
| X5111A
 [S] | 540-7713 [C] | 4GB (2 × 2GB) Memory FRU, | n/a |  
|  | 2GB Registered ECC DDR2-800/PC2-6400 DIMM, 
 | n/a |  
| NOTE: 667MHz and 800MHz DIMMs can not be mixed. NOTE: Use DDR-667 FBDIMMs with the Xeon E5405, L5420, and X5460 processors.
 Use DDR-800 FBDIMMs with the  Xeon E5462, X5472, and X5272 processors.
 
 |  
| 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
 |  |