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Why does iMac spark when I connect printer?

I tested the ground connection from iMac to the wall socket, and there is continuity, so the grounding seems fine. However, when I tested the printer’s USB, I measured about 90V AC coming from the printer https://imgur.com/a/kMTRIFa Also, when I…

Ram not overclocking with expo

Packaging says it should go up to 6000 MHz with expo but even after I turned expo on nothing changed. I see that the VDDIO Voltage is not changing does that have anything to do with it? (Edit) After I…

Help with overclocking

First time overclocking with 5090 FE. These are my metrics so far. Note: I do plan to undervolt after I OC. Question. how are people managing to AVG 14500 (assuming no OC) when I have to OC to get there…