Aspire E5-771G and Samsung 256GB 950 Pro SSD - 4x PCIe Compatibility

Dear Acer Users,

I would like to equip my Aspire E5-771G-71PT with a 256GB Samsung 950 Pro SSD. The Mainboard Model reported by CPU-Z is EA70_HB (0x000001D6 - 0x00548742).

Does the PCIe-NVMe interface provide the 4 PCIe channels at full speed or is it capped as reported by http://community.acer.com/t5/V-and-VN-Series-Laptops/Why-is-the-M2-PCIE-slot-speed-capped-to-1-5GBs-VN7-592G-71ZL/td-p/394275 for this VN7-592G-71ZL model?

Does anybody have a recommendation?

Or is the Samsung 850 Evo M.2 sufficient for the Acer E5-771G model?