So as a quick update, it looks like both the Kingston HyperX Predator and Samsung 950 Pro are both bootable on an X58 chipset.
The reason for 950 Pro being bootable, is that Samsung included a controller which is compatible with legacy bios' (i.e. non-UEFI), I assume this is also why the HyperX is also bootable on an X58.
I'm currently leaning towards the 950 Pro due to the following differences between both drives:
...showing the Samsung being far superior to the HyperX.
That being said, multiple users have complained about the 950 Pro becoming overheated, which leads to a drop in performance (meaning that the 950 Pro must be passively or actively cooled to ensure peak performance).
Nelson