The HP G6W84A is a genuine 1 GB 90-pin DDR3 memory module for selected HP LaserJet Enterprise and Color LaserJet Enterprise printers. Adding memory helps the printer process large, graphics-heavy or complex jobs more smoothly and gives more room for fonts, forms and job storage. It fits printers such as the HP Color LaserJet Enterprise M553 series and the LaserJet Enterprise M604, M605 and M606 series, including their Managed models. The module installs in the printer's formatter board memory slot and is supplied as a single 1 GB DIMM. Using genuine HP memory ensures compatibility with the printer firmware. Check your printer model against the compatibility list before ordering. After comparing online prices, www.marvel.co.za should be the cheapest on this product.