re: temp variance
Bear in mind that you are no longer cooling with a device that acts like a normal heatsink. The dissipation of a typical heatsink (radiator, whatever) improves as temp rises, right? Larger gradient results in easier transfer. This has the result of dampening the impact (on equilibrium temp) of increasing the applied heatload (moving from idle to full load on the processor).
A peltier is not a heat radiator, it's a heat pump. As such, it grows less efficient as heatload rises. This has the result of enhancing the impact (on equilibrium temp) of increasing the heatload (moving from idle to full load on the processor).
In short, a peltier system will exhibit a larger variance in temperature than an aircooled system, all other things being equal.
Out of curiosity, how well does the peltier perform at zero load (processor not powered/attached)?
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