in short yeah it does hurt it
like a v8 351 clevlend if u run it to the floor all the time shes guna run hot an die faster
[now allso like the computer] if u put a bigger heatsink/rad on the moter/cpu it will do better at 100% use but it dosent stop at the cpu the chipset/oil gets hot now so u need a intercooler
Kind of a nice anology you used there, but I'm a mechanic apprentice, and gotta say there is some more difference than that, but I still like your style. Intercoolers do not cool oil, Oil Coolers do ironically as it may sound, and Intercoolers are often misrepesented, but should not be used on a Naturally Aspirated Motor (non turbo/supercharged) since there is no increased air pressure to keep the flow at a more constant forced induction rate...using it on an NA motor actually makes the air charge warmer and more restricted, thus losing power and efficiency due to the extra tubing with it's bends and a basically empty high-flo radiator designed for dense air charge cooling. And Intercoolers are all to often mistaken for Aftercoolers, but that is more in racing tech terms which I do not follow as closely, so I wrongly use the term intercooler just as much as the car manufacturers do! Other than that, good way to mix vehicles/PC's, props dude!
basikly the more heatsink work u do to the board/wideo card w/e the les damege high volts will do
To a certain extent as far as heat dissapation, but the degredation of the circuits that is caused by feeding higher voltages than rated will still be there. And so will the lower life expectency, for every step higher in voltage you go, the less life you can expect, even if you run very low temps. Current technology and production quality is getting better so it can actually handle some overvoltage before severe degredation begins, but it still happens and will happen even at stock voltage, it will just take longer. But heat is probably the biggest enemy to fight since we can get away with somewhat higher voltages nowadays for extended periods until failure, and without removing heat, this will not be possible.