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I'm guessing the PSU has one of those temp sensing fans on it.
The PSU Fan adjusts its revs based on the temp of the air flowing past it. When it goes into standby, it's not working as hard. The case temp drops. The PSU fan drops it's revs, because it isn't needed so much, then it triggers the rpm threshold sensor on the mobo.
Check the amount of air pushed out by the psu fan when the system is working, then compare it 15 minutes after going to standby.
I'm betting the flow is greatly reduced.
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