FX-8120 Bulldozer and Corsair H100 now.
I have been running Boinc 24/7 with 100% usage for FX-8120,AMD Powercolor 6870 and Nvidia Palit GTX 460 1gb. World Community Grid with Cpu, Moo!wrapper with AMD Powercolor 6870 and Primegrid with Nvidia Palit GTX 460 1gb. Just smooth crunching and I can use internet,Youtube and do all the things i usually do, even PC is crunching Boinc tasks with 100% system usage.
Corsair H100 does good job keeping FX-8120 temps down. I replaced Corsair H100 original fans with two Scythe Gentle Typhoon 1850 rpm fans, because of the noise original fans made and did see temps drop 2 C with Scythe Gentle Typhoons as well.
While crunching no cpu related temperature have past 53 C/127 F. Note: FX-8120 is overclocked to 4 Ghz with two overclocked Gpus with 100% usage in not so big Xigmatek Midgard Midi case. System is powered by very solid and silent PSU Thermaltake ToughPower XT 775W . Motherboard is Gigabyte GA-970A-UD3 and Gigabyte motherboards are perfect with good VRM.