Thanks for the update. I'm using an Asus P6TD Deluxe and it allows me to turn off turbo and use the extra multiplier for overclocking. I've previously run a Core i7 920 on this motherboard and never seen this behaviour.
The settings I'm using that initiate 'throttling' (not sure what to call it now after your explanation) are a BCLK of 180, multiplier of 25 to give 4.5GHz with a vcore of 1.3875v. I'll do some screen shots but basically what happens is that with Prime95 small FFTs the multiplier drops in CPU-Z from 25 to 24 within a couple of seconds and stays there and the CPU speed is shown as 4.32GHz. Although this in theory should reduce the temperatures they still stay a fraction higher than they do at 4.425GHz (BCLK 177 x Multi 25 at 1.35v). That could be explained though by the slightly increased vcore. At 4.425GHz there's no sign of the multiplier dropping even after a few hours and recorded temperature don't exceed 37ºC above ambient, typically around 20ºC at the time of testing.
Edit: Just seen your edit. I'll spend a bit of time working through the implications of loading that BIOS and depending on the risk might give it a try.
Also forgot to add that I've never had the 'Thermal Status' show anything other than OK. I was aware from your guidance that it would show LOG or PROCHOT if limits had been exceeded.
Before running Prime95
Before p95.jpg
A few seconds after Prime95 started and the multi drops to 24
After P95.jpg
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