Dell A1584440 | 512MB PC2-5300 DDR2-667MHz non-ECC Unbuffered CL5 200-Pin SO-DIMM Dual Rank Memory Module for Latitude D420

Technical Specs:
- Memory Type: DDR2 SDRAM
- Memory Size: 512MB
- Memory Speed: 667 MHz
- Memory Standard: PC2-5300
- Form Factor: 200-pin SoDIMM
- CAS Latency: CL5
- Error Correction Code: Non-ECC
- Rank: Dual Rank
- Voltage: 1.8V

Helpful Notes:
1. This memory module is compatible with the Dell Latitude D420 laptop.
2. It has a clock speed of 667 MHz, which provides faster data transfer rates.
3. The non-ECC feature means that it does not have error correction capabilities, but it is more affordable than ECC memory.