I did experiments on this recently. Having it vertically caused the bottom portion to be cooler after 2 hours endurance race in GT5. My theory is that the bottom part touches the surface of the table it's on, heating the table up. The table retains some heat, but also gives some back to the plast of the ps3. This in turn results in a hotter bottom surface.
Unfortunately, I couldn't learn how the actual internal components are affected (vertically or horizontally). All I do know, is when I put it vertical, my BLU-Ray drive makes weird noises, comparet to relatively silent in the horizontal position.
So....i'm keeping it horizontal now, but I don't like how the bottom part gets hot. I laptop cooling pad would probably be the best bet (as long as it's completely horizontal)
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