A-Tech 4GB DDR3 1600MHz CL11 1.5V 204-Pin SODIMM 1Rx8 HP 641369-001 B4U39AA B4U39AT Laptop RAM

4GB DDR3 SODIMM for laptop upgrades

This 4GB DDR3 1600MHz module adds memory capacity to compatible notebooks and all-in-one systems. It targets users who need a straightforward capacity increase for everyday multitasking and smoother application loading. The single stick installs into an available 204-pin slot. Buyers who want more storage or a faster memory standard should look elsewhere.

Unbuffered 1.5V stick with major-brand chips

The module uses major-brand DRAM components on an unbuffered, non-ECC PCB rated at 1.50V standard voltage. Its 204-pin SO-DIMM edge connector matches the physical slot found in many DDR3-era laptops. CL11 latency and PC3-12800 bandwidth deliver the expected timing for this generation. Systems requiring registered or ECC memory cannot use this stick.

Replaces HP part numbers 641369-001 B4U39AA B4U39AT

This module serves as a direct equivalent for the listed HP part numbers, simplifying the search for a compatible upgrade. The jump is worth it when your current configuration leaves headroom for an additional 4GB and the platform supports DDR3 1600 operation. Verify your system's maximum supported capacity and slot count before ordering.