Apple 661-5846 | 4GB DDR3-1333MHz PC3-10600 non-ECC Unbuffered CL9 204-Pin SoDIMM Dual Rank Memory Module for MacBook Pro

Technical Specs:
- Capacity: 4GB
- Memory Type: DDR3 SDRAM
- Memory Speed: 1333 MHz
- Form Factor: SO-DIMM 204-pin
- CAS Latency: CL9
- Data Integrity Check: Non-ECC
- Rank: Dual Rank
- Voltage: 1.5V

Helpful Notes:
1. This memory module is compatible with MacBook Pro models released in 2011 and 2012.
2. Upgrading your MacBook Pro's memory can significantly improve its performance.
3. Non-ECC memory is generally less expensive than ECC memory, but it doesn't provide error checking and correcting capabilities.