CT51272AB667 - Crucial Technology 4GB DDR2-667MHz PC2-5300 ECC Registered CL5 240-Pin DIMM 1.8V Dual Rank Memory Module

Technical Specs:
- Capacity: 4GB
- Memory Type: DDR2 SDRAM
- Memory Speed: 667MHz (PC2-5300)
- Error Correction Code (ECC): Yes
- Registered: Yes
- CAS Latency: CL5
- Pin Count: 240-pin DIMM
- Voltage: 1.8V
- Rank: Dual Rank

Helpful Notes:
1. ECC and Registered memory modules are designed for servers and workstations, providing higher reliability and stability.
2. DDR2 memory is an older technology and may not be compatible with newer systems.
3. Make sure to check your motherboard's specifications before purchasing to ensure compatibility.