I have a GTX 1070
Game only uses 34% of GPU and 23% CPU on my computer game seems fine for me. Barely ever have fps drops even in majorly built up areas. Partners computer is a i5 and has a GTX 1050 and also runs perfectly fine. Both on Max settings.
1660Ti + i5
Max/Ultra settings in Boundless, never have any issues
(Usually multitasking as well, never see performance drops unless I play COD MW :p)
well cpu load is also low with boundless usually around 30-50%
have to add, as others have had, that even though I feel compelled to upgrade, boundless runs just dandy with a 1070 (and 3600x), with everything at highest level (plus some extra lod and fov) on a 4k monitor.
future proofing for when boundless has ray tracing in vr is a good thing though, no?