Strange artifacts in 2008 iMac

Strange artifacts in 2008 iMac

I am trying to install Monetery on a 2008 iMac 8,1. Everything seems to work ok, but I get really bad artifacts intermittently.

https://preview.redd.it/b94ob7piyehb1.png?width=1700&format=png&auto=webp&s=273d6c8142aa45310da0f8d2dc072b4c7bde2320

Has anybody seen something like that before.

submitted by /u/Plus-Fig9137
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