The H100i can cool better, by 2 or 3 deg. C., but the Noctua is much quieter and significantly cheaper. Based upon this review and others, I bought the Noctua and I have been very pleased with it!
CPU Cooler:CRYORIG R1 Ultimate 76.0 CFM CPU Cooler ($89.99 @ Newegg) Total: $89.99 Prices include shipping, taxes, and discounts when available Generated by PCPartPicker 2014-09-09 15:10 EDT-0400