CL4 / CAS 4 refers to the clock latency. Typical PC2-6400 800MHz is CL5 / CAS5. For performance RAM, the lower the better, ie 4 better than 5.

Made from the highest quality components, Quality DIMM are designed to increase productivity and help your PC work faster. Backed by a lifetime warranty, 100% tested reliability, Quality Memory is the standard in PC memory upgrades.

Quality Memory has developed one of the most advanced testing facilities in the industry. Quality Memory employs a multi-tiered testing system to ensure quality control throughout the design and manufacturing process.

Specification:

1. Standard 128M X 64-bit
2. Unbuffered DIMM
3. Non-ECC
4. PC2-6400 or 800MHz
5. 240-pins
6. SDRAM-DDR2
7. 1.8V
8. CAS Latency CL4 (lower the better and faster)