Add a layer of security to your printing environment. With HP High-Performance Secure Hard Disks, you can easily help secure valuable data at rest on your HP LaserJet printer or MFP. Improve printing performance of complex documents by enhancing data flow with HP memory upgrades. Get complex print jobs completed faster and meet your deadlines more easily. 1 GB 90-pin DDR3 DIMM-Dual in-line Memory Module for Printer. Compatible with HP LaserJet Enterprise M604DN, M604N and HP Color LaserJet Enterprise M553DN, M553N and M553X.