Yup there’s more proof that it works! As I said before you should have no problems with the 6-pin PCIe power connecter.
As I said before upgrading the PSU would allow me to upgrade the GPU to a higher level. Because one of the only things limiting the upgrade IS the PSU. Therefor making the Z400 more future proof. But that’s just me
. You can do whatever you please with that GTX! You can stay updated on that forum if you’d like. Good luck.