We realy liked the cooling system of the ASUS GeForce GTX 660 Ti DirectCU II TOP, that runs under Windows idle and under load exemplary quiet - very good, perfectly suited for a silent PC. The GeForce GTX 660 Ti Phantom and the MSI GeForce GTX 660 Ti Power Edition OC reaches in this discipline almost identical values that are significantly worse than from Asus, but they thy are still "good".
https://www.asus.com/images/award_logo/1265/8173.png
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