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Basically as long as the main heat producing parts are effectively cooled, (the power fets), other parts aren't likely to seriously overheat quickly. I took the view the transformer could benefit from some cooling help so my table mount helps a little here. The coil I found getting hot later on and there was a few solutions to this, (In my PSU update article on my site). The hot ceramic resistor I found later using a infra red laser temp sensor.
There are also other variables to like what is your coolant temp? / flow rate?, and as previously mentioned each PSU design is different, what may not get hot in PSU design A with no airflow might get red hot in PSU design B with no airflow. Heat rise will work a bit, but it's the wrong way to look at it. In a similar way to heatpipes being a poor overall solution as they both require a significant heat factor to be going on somewhere for anything useful to start happening. I approached it with cooling at source in mind, (fets on a block over the coolant channel), mainly to avoid an in PSU heat up. with the other hot parts I found and cooled as I went it now runs no more than warm under gaming load with no forced airflow anywhere near it. Of course It could die tomorrow due to something I've over looked, no way of knowing for sure...........
Unfortunately this area of modding is still very much "suck it and see" after effectively cooling the obvious areas.
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