Crucial CT51272AB667S | 4GB DDR2-667MHz PC2-5300 ECC Registered CL5 240-Pin DIMM Single Rank Memory Module

Technical Specs:
- Memory Type: DDR2 SDRAM
- Capacity: 4GB
- Speed: 667MHz (PC2-5300)
- Latency: CL5
- Pin Count: 240
- Rank: Single
- Error Correction Code (ECC): Yes
- Registered: Yes

Helpful Notes:
1. This memory module is designed for use in servers and workstations that require ECC and registered memory.
2. Make sure to check your motherboard's compatibility with DDR2 memory before purchasing.
3. This module is a single rank, which means it has fewer memory chips than dual rank modules, but it can still provide good performance.