Fore sure, in 90hz mod you will miss 15 frames per second, might create various issues like stuttering. Having same fps in 75hz mode wont create any issues and you will barely notice any difference between hz mode (75 vs 90).
p.s. like in 2d games, you can notice the difference only by quick turning. When looking forward it wont be that obvious, which would mean if you play a racing game with a 3rd view looking all the way straight - even 30 fps would be acceptable, in a 30hz mode or 60hz with 100% reprojection. The issue is, if you play sim racing from the cockpit, you need to look left and right quickly and very often. This is where you need stable and higher fps and hz mod.
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PIMAX Headsets has Big FOV so you should not move your head as much as HP, OCULUS, HTC, SAMSUNG and VALVE.
Evidence of this is XTAL headset using 70 hz for VR simulation
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Frame pacing is more important than framerates.
Not all 60fps is created equal. A more stressed system achieving 60 fps tends to create irregular frametimes.
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thats pretty much it.
a system that cant feed the hmd or display with the amount of frames it needs per second, is obviously struggling and creating irregular frametimes which is perceived as stutters, microstutters, lag, etc.
in VR this usualy leads to strained eyes, headaches and nousia.
thats why 75fps on a 75Hz panel is just fine, but 75fps on a 90Hz panel isnt.
if they are both running at 60fps, both suffer equaly.
you allways want your displays maxed out!
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