The ProBook 450 G2 is unique because it allows for dual-drive configurations: HP probook 450 G2 support which Mini-card SSD
Modern M.2 SSDs (both SATA and NVMe) expect:
After scouring HP support forums, Reddit, and real-world tests from upgrade enthusiasts, only a handful of M.2 2242 drives have been reported to work in the ProBook 450 G2’s WWAN slot.
Many cheap M.2 SATA drives (like the Kingston A400) use DRAM-less controllers. While they work fine, they can stutter under heavy multi-tasking. Your ProBook 450 G2 will perform better with a drive that has a DRAM cache (e.g., Crucial MX500, WD Blue 3D NAND, Samsung 860 EVO—though the 870 EVO is SATA, make sure you buy the M.2 version, not the 2.5-inch).