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The IFX-10 is meant to keep the backside of your motherboard cool and eliminate the possibility of a 'warm spot' developing there. While it won't affect the CPU temperatures by much, it helps keeping the overall cooling system more stable. I wouldn't call it 'pure gimmick' but I don't think it would be really useful for anybody but extreme overclockers. Only then the possibility of a warm spot at the backside of the motherboard (caused by the high voltage, current, power consumption) could be a factor in need of attention.
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