16GB ( 1x 16GB Module ) DDR4 2133 MHz ( PC4-17000 ) DDR4 SODIMM ( 260-Pin ) Non-ECC SODIMM ( Unbuffered SO-DIMM ) 1.2V - DDR4 Standard Voltage Compatible Equivalent for HP 820571-002, 834942-001, 865979-001, T0H91AA, 816496-971, 820571-001, P1N55AA, X2E91AA, 865965-001, 798038-001, P1N55AT High performance Memory RAM upgrade designed for Laptop/Notebook/All-in-One Computer Systems All modules undergo quality assurance testing to ensure dependable and reliable performance Please verify the supported memory (RAM) specifications of your system prior to purchase to ensure compatibility A-Tech provides a Lifetime Warranty for all orders & offers complimentary United States based Tech Support before, during, & after your purchase