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I've got an Asus fanless 8500 GT (512 MB version) and while it's not that bad, the heatsink still gets rather hot to the touch. An 8600 has to be even worse. You can look at the TDP ratings of those GPUs to get an idea of how hot they'll run passively.
Alternatively you can get a regular fan-cooled GPU and replace it with a passive cooler. Those latter generally give you a lot more surface area the heat can be dispersed with. Just make sure there's always sufficient airflow in the case or whatever solution you'll go with won't matter a bit
From the data, we can conclude that the ATI Radeon HD 2600 XT uses 37 watts of power when idle. That is certainly respectable. However, that is also 15 watts more power than the XFX GeForce 8600 GT XXX video card used while idling.
At full load (in Oblivion), the tables are turned, at least a little. Our measurements showed that the XFX GeForce 8600 GT XXX used 3 watts more power under full-load conditions than its rival, the ATI Radeon HD 2600 XT. However, when we overclocked the Radeon, even that small advantage disappeared, and to no avail (see Overclocking section below).