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980 Ti / MacPro 3.1 - 4k image too small, can't see recovery mode screen
Just got a Geforce 980 Ti and 4k tv for my old (not Hack) MacPro 2008. 4k image is too small, and no controls for scaling, so trying to use SwitchResX, but it now says no custom anything in OSX 10.11.6 (can't update further) without first disabling SIP which seems to require CMD R at boot...