novabean there are few Air heatsinks/AIO H2O that will be able to push a Fx 8 series chip to 5.0 for a 24/7 overclock. For starters you would need a heck of a low leakage chip to get there, without all the heat. Most of the people that run these things near those speeds run full custom H2O loops and even with that running 5.0 for an everyday overclock is a tall task. Personally I only run mine at 4.7 with a custom loop and a 360 radiator "see signature". The reason I only run 4.7 is because the amount of voltage necessary to run 5.0 for a stable overclock and the heat generated is huge. To me it's just not worth it to run there, I can but choose not to. I have my chip stable up to 5.1 for 24/7 usage but again it's just not worth it to me to run there. If you're just looking to do it for benching purposes then you may be able to get away with a big all in one H2O setup, for short, light on the cpu, benches.