I have the H80i since now a year like long it lasted during operation and can really only about complain until the pump has been recognized under Windows 8.x. I have it ultimately only managed the CorsairLink_Installer_RC_v2.7.5339.exe that I can fix my fans again. Fortunately, the pump has (which I had set under Win7 on "Quiet"), the setting also noted to 8.1. By default, the fan rotates from 40 ° C up to about 1500rpm, is so noticeably loud. The maximum of the fans is 2200rpm, but that's untenable loud.
At idle, bring the part my LGA1155 i5-2500K (1.6 GHz) at ~ 30 ° C down, the fans turn here with 500rpm. Under load (4.8GHz) I come to ~ 75 ° C, with 1500rpm.
Plug it does headfirst into a Sharkoon Temptation enclosure without additional fans.