I poked every condensator and inductor I could reach on the video card and motherboard with a q-tip. No results.
Now that I listened carefully, I could also hear the squeal in 3DMark, but only when a new test was being loaded. I'm starting to lean towards the "massive IO" as a cause, as well. I also detected a similar and constant noise in GTR, but it was on a lower frequency, and a little quieter.
I tried forcing FSAA and AF, but the squeal remained. Next I'm going to install v101 and see if the noise goes away, as cyberslicer reported it did.
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