Modern CPUs have the GPU built in for HD630 resolution. Where do these processors (like the i3 8100) fit in relative to screen resolution? Are the AMD processors much better?

Recent low-tier AMD chips (specifically, the R3 2200G and the R5 2400G) have the best integrated GPUs on the market, and may be suitable for 1080p gaming in some situations. Intel iGPUs are typically only suitable for gaming on laptops with monitor resolutions below 1080p. For a specific ranking of these iGPUs alongside discrete GPU options, take a look at where they are listed in our graphics card comparison chart.

I'm running a 2009 Mac Pro tower (4,1 flashed to 5,1) with the NVIDIA GeForce GT 120 512 MB graphics card and MacOS 10.13.6 High Sierra. It has dual 1080p displays.
If I set graphics to Full Screen, WOT runs nicely on one screen but the other is blacked out, so I need to run in Windowed mode. That way I can see Teamspeak on the other display and know who to teamkill :-) Or to learn the voices in my head/in the headphones.

I have read that the Radeon RX 560 will run nicely in the Mac and is Metal capable so it can run MacOS 10.14 Mojave. See Macvidcards.com
The RX 560 costs about $150US as of mid Oct 2018.

A very helpful article from the Logical Increments team. The effort you put on this is very informative.

Thanks! We're glad you like it.

nice article, logical increments!
tooK somE digging to find it though - maYBe add a tab fOr ARticles next to 'blog' on the home DiSplay, perhaps?

Thanks for the feedback! We'll consider it for certain.