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If the issue happens only when using the video capturer device, and you already have all available driver updates and BIOS update, then this could indicate that the issue is more related to the video capturer device.
I'm having a similar problem... an i3 2105 that bluescreens or hardlocks every day or two, but all I'm doing is web browsing. No video capture of any sort (but no squealing noise either.) So far I'm thinking the CPU is the problem. I should make a separate post for it tho'.
Turns out the answer really was in the BIOS upgrade. In my OP, I said, "I'm preparing to flash the BIOS to the latest, though there's nothing in the release notes to indicate that would help." However, after the BIOS flash on this board from 80-something to 125, the problem as not returned after several days and after lots and lots of recording. This upgrade passed through v.119, which notes fixing a problem with "TV tuners." This Hauppauge card is not a TV tuner, it's a TV capture card, but apparently this fixed it nonetheless. Good news for all involved/interested.