Don't bother with passive solution. I had this http://www.newegg.com/Product/Product.as...-_-Product and it was dead silent and not to mention much faster than the ones NaturalViolence recommends. Spend the extra money and get the 1gb, it's worth it!
[color=#3366ff]CPU: Intel Core i7 4790K OC'ed @ 5GHz[/color]
[color=#339933]GPU: MSi N580 Lightning Extreme 3GB[/color]
[color=#cc3333]RAM: CORSAIR Vengeance Pro 16GB DDR3 @ 2666MHz[/color]
[color=#333333]HDD: Samsung 840 Pro SSD 512GB[/color]
[color=#6666ff]CPU cooler: Noctua NH-U14S w/Noctua NF-A15 PWM 140mm Premium[/color]
[color=#ff3333]MOBO: Asus Maximus VI Hero LGA 1150 Z87[/color]
[color=#cc3399]CASE: Thermaltake Urban T81 Full Tower[/color]
[color=#339933]GPU: MSi N580 Lightning Extreme 3GB[/color]
[color=#cc3333]RAM: CORSAIR Vengeance Pro 16GB DDR3 @ 2666MHz[/color]
[color=#333333]HDD: Samsung 840 Pro SSD 512GB[/color]
[color=#6666ff]CPU cooler: Noctua NH-U14S w/Noctua NF-A15 PWM 140mm Premium[/color]
[color=#ff3333]MOBO: Asus Maximus VI Hero LGA 1150 Z87[/color]
[color=#cc3399]CASE: Thermaltake Urban T81 Full Tower[/color]