Weird graphical glitches in catalina

[wooders]

hi have been running the catalina betas successfully until i installed the epic games store for fortnight . since then i have been getting these wizard graphical glitches. they have been getting steadily worse until this morning where the entire system has become unstable the whole screen flickers and I'm getting artifacting on the screen like my cpu is dying, but i don't get these in windows 10. my cpu is the gtx 650 ti 2 gb. have apple ended support for this or is something more sinister happening

andy

 

[wooders]

iCloud

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I cloud link to video of it booting and problem. It seams to be Intermittent but it does do it a little bit

 

[wooders]

go to 3.22 for the problem