Correct iGPU settings for 9900k / iMac19,1?

I always try to keep my Hack as close to possible as the "real" Mac I am emulating. I have a 9900k on a z390 board.

In Mojave 10.14.4, I was using iMac18,3 and had the iGPU enabled since that's how the real thing is.

Does anyone know if real iMac19,1 have their iGPU enabled or not? What's the best way to configure a 9900k/iMac19,1 these days in Clover?

thanks!