Arch Memory Certified for HP 4 GB (1 x 4 GB) 240-Pin DDR3-1333 PC3-10600 UDIMM RAM Arch Memory is a Registered Trademark of Arch Computer, LLC Works in all HP Hewlett Packard computers that support this specific speed and capacity. If unsure, please contact us; we can verify it when you provide us your make and model computer. 240 pin SDRAM UDIMM DDR3 RAM Upgrade Limited, Lifetime Warranty through the Seller