This graph is a summary of each of the cooling methods. The risk was calculated by observations of the dangers present during installation. There is no mention of peltiers at this time for a few reasons. First, they cost a lot more than any of the choices above. Also, they are very risky on video cards.
Condensation can short out the card.
If the fan fails to cool the peltier, the video card will be destroyed by the overheating peltier. Also they take a lot of space, and power. However, for the daring and brave, a peltier can lead to amazing results. Then started moving up my Memory Timings and got that to 120 before things got funky. If you try to take the Memory timings above 120 or the CPU above 150 the whole system will lock up after one minute in quake.