16GB KIT (4 x 4GB) For HP-Compaq HP Pavilion Desktop S5390d S5395a S5430jp (CTO) S5450jp S5500kl S5521fr S5535uk S5537kr S5539kr S5540in S5540kr S5545la S5550br S5550z S5556uk-m S5558hk S5560f S5562f S5568hk S5570t S5575es S5577kr S5580d S5580es S5580t S5588d S5588hk S5589d S5590d S5595kr S5598d S5599d S5599kr S5623la S5625la S5628hk S5630br S5648hk S5650z S5653uk S5660f S5668hk S5670t. DIMM DDR3 NON-ECC PC3-10600 1333MHz RAM Memory. Genuine A-Tech Brand. 16GB KIT (4 x 4GB) DIMM DDR3 NON-ECC PC3-10600 1333MHz RAM Memory Genuine A-Tech Memory Lifetime Warranty Toll Free Technical Support 1-866-557-4527 Designed For HP-Compaq HP Pavilion Desktop. (See Compatibility List Below)