4GB DDR4-2400 SODIMM FOR HP - Z9H55AAAxiom Memory Axiom 4GB DDR4 2400 SODIMM for HP Z9H55AA For Notebook 4 GB DDR4 2400 PC4 19200 DDR4 SDRAM 2400 MHz CL17 1. 20 V Non ECC Unbuffered 260 pin SoDIMM Lifetime Warranty VPN: Z9H55AA AX SKU: RSC302428 UPC: 841280143250 SoDIMM 4 GB memory allows you to have more programs open at a time 2400 MHz memory speed with Unbuffered signal for great multitasking capability 260 pin pin DDR4 SDRAM interface synchronizes electrical and clock signals for an