Exactly. In short that's like insulating the rad.
Just let it dissipate heat into the room.
Ah also i'd want to be able to lift the PC, not to mention taking it to LAN parties...
BladeRunner's config use a Huge (tm) res buried deep into the ground. Actually the ground takes the heat away.
Apart from this special case, you're better off with a true rad. It will be far more efficient than a res spreading that heat away...
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