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HP zBOOK 15 G2 maximum PCIe speed for M.2 SSD

HP Recommended
Example: zBOOK 15 G2
Microsoft Windows 10 (64-bit)

What is the maximum speed the PCIe M.2 SSD can handle?


Currently the 256 GByte SSD is      PCIe 2.0 x2  (~740/600 MBps).


I wish to upgrade (i.e. replace current 256 Gbyte SSD) to 2Tbyte SSD PCIe M.2 and the speed options available to purchase are:-


PCIe 2

PCIe 3

PCIe 4


with each series approximately doubling in price. 


What is the fastest speed the HP zBOOK hardware can support (operate at) and is it actually NOT SATA product  - i.e. NVMe PCIe that I need? 

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