MacPro 3.1 / 980 Ti - 4k image shrunk (switchresx?) - no screen in recovery mode

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CheezeMac New Member • Posts: 3
MacPro 3.1 / 980 Ti - 4k image shrunk (switchresx?) - no screen in recovery mode

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. Unfortunately, no screen comes up when I do this.

Is this because the 980Ti can't display the recovery mode boot screen? It is "mac flashed", and does display option boot for drive selection. Is something else going on, or am I going to need to reinstall the factory card just to access recovery mode just to disable SIP?  If so, can I just leave it in there?  Does it matter that the 980 Ti occupies the bottom 2 slots?

Am I missing another utility or simpler way I can get scaling options or other way to fix the display?

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