This 4GB DDR3 compact SO-DIMM from Arktek, running at 1600MHz. As a compact SO-DIMM, it installs into a laptop, notebook, mini-PC, or other small-form-factor system with SO-DIMM memory slots rather than a full-size desktop. Matching capacity, speed, and form factor exactly to the target system (and, for a multi-module upgrade, matching modules to each other) is what lets DDR3 memory run reliably at its full rated speed rather than falling back to a slower, auto-negotiated speed or failing to POST altogether. The catalog's "PC-1600" designation is the JEDEC PC-rating shorthand for the DDR3-1600 speed grade. At 4GB in notebook format, this suits a basic capacity upgrade or replacement stick for an older DDR3-platform laptop handling everyday web browsing and office tasks rather than modern memory-hungry applications. It ships with the standard manufacturer warranty and is aimed at builders, upgraders, and IT professionals in South Africa who need accurate specifications to match against their existing platform.