Like I said above, watercooling PCs is not for everybody. (sorry if that sounded harsh...just trying to get a point across)
Sounds pretty realistic to me, which is exactly the answer I was looking for

I also use a P4-2.1 GHz fan cooled, but it's a company machine and tweaking is verboten .

You cited several temperatures (65C, 50C, 35C, etc.). I assume those are at the cooling block, as it might be kinda tough to measure die temperature .

But, what is the delta across the case of the cpu? (I know Intel and AMD probably publish these figures in the data sheets, but you're closer ).

robotic regards,

Tom
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"I can never remember whether it snowed for six days and six nights when I was twelve or whether it snowed for twelve days and twelve nights when I was six."
- - Dylan Thomas