Upgrading my CPU for JHL90 from T5800

I'm trying to upgrade my JHL90's CPU from T5800 to anything better.

Does anyone know what my options are?

T5800 is a 65nm processor, and many of the other JHL90's I've seen have 45nm processors, like the T9600.
This does not make sense to me...
did JHL90 have motherboards of different standards that allowed for different sized CPU's? Or are the 45nm and 65nm CPU's interchangeable (wouldn't make sense, would it?)

Anyway, I'm just wondering what my option is in upgrading my CPU from T5800.

And on a side note...
does your JHL90's get blazing hot (70-80 C) while doing mundane, everyday things? Do you think the thermal compound is the most probable reason for this?

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