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Semaj

Optiplex 7020 Catalina weird intermittent freezes and beachballs

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Everything looks Ok to me, especially on the HD4400 graphics front. You' have full graphics acceleration and I see your display connected over HDMI. How's CPU power management? Check it with HWMonitor app (if you have FakeSMC PlugIns installed) or Intel's Power Gadget.

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We have an entire thread dedicated to Azul framebuffer patching in our R&D->Graphics section; look it up. But if things work fine on the graphics front, you've got nothing to do really... 

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From what I had read, the freeze occur with unused connector(s) on an Haswell I3 CPU. This issue doesn't occur on higher CPU like i5 or i7.

Determine the ports that you don't need and disable it.

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