Adamanta 32GB (4x8GB) Laptop Memory Upgrade for HP Zbook 15 Mobile Workstation DDR3L 1600Mhz PC3L-12800 SODIMM 2Rx8 CL11 1.35v Notebook DRAM 32GB ( 8GBx4 ) 1600 Mhz Non-Parity/Non-ECC Unbuffered Memory 204pin Low Voltage DDR3L Dual Rank Module. Every module is backed by a lifetime limited warranty. We always have hundreds in stock! Free technical support from our experienced technicians. Every single module is fully tested by the manufacturer. May not work on all devices. Please check your device's specifications before purchasing. May require a x64 bit OS to upgrade. Our experienced technicians can verify if these parts will work for you.