CT51272AB53E - Crucial 4GB DDR2-533MHz PC2-4200 ECC Registered CL4 240-Pin DIMM Dual Rank Memory Module

Technical Specs:
- Capacity: 4GB
- Memory Type: DDR2 SDRAM
- Memory Speed: 533MHz (PC2-4200)
- CAS Latency: CL4
- Pin Count: 240
- Rank: Dual
- 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. The DDR2-533MHz speed is relatively slow compared to modern memory standards, but may still be suitable for older systems.
3. Make sure to check your system's compatibility with ECC and registered memory before purchasing.