It's all down to what fans you use mate. As for the Wing Boost 2 fans, I bought 6 of the 140's for push pull on a 420 rad, and yes they're quiet, but as far as performance goes I didn't rate them at all. They're not really a rad fan, they are ideally for a case fan.
I'm using an apache on my Kraken X41. Running at 1200rpm, can't hear it and CPU is just over 40 degrees on full load
Whats the X41 like at stock?
