NVidia drivers
I've updated the nVidia drivers to the latest version and now I can't get the HMD to use 90 or 120Hz, when I try to set it it reverts automatically to the previous one and the tests doesn't allow me to even check them, it says it's incompatible and that's all, it seems they've enforced the parameters exposed by the HDMI info.
Anyone knows a way to circumvent this?
There are several ways to 'Override EDIDs'. https://msdn.microsoft.com/en-us/library/windows/hardware/jj133967(v=vs.85).aspx https://www.monitortests.com/forum/Thread-Custom-Resolution-Utility-CRU?page=1
I've attached a modified EDID with 90Hz and 120Hz using the CRU tool, but it is UNTESTED... psvr_mod.zip
I made another setting, and was able to install this via CRU (start CRU, select PSVR 'monitor', import binary, hit OK and then restart the system). I wasn't able to install the 'inf' for some reason, but it may work for some people/systems.
After this I was able to select 120Hz mode via the display properties, without having to create a custom setting.

Zip contains original EDID ('bin' and decoded 'txt'), 120Hz EDID ('inf', 'bin' and decoded 'txt'). psvr_120.zip
Perfect, I will try it tomorrow.