Your memory is running at 560 MHz according to AIDA64 but it if you look at the Extreme Memory Profile, it should be capable of running reliably at 800 MHz with much tighter memory timings. Different users have different goals when overclocking. Some are happy at the level you are at while others aren't happy until they are on the edge of self destruction. If you are happy at the present level then you could probably lower your core voltage which should help reduce your full load temperatures. If you intend to overclock further then increase the bus speed some more. If you need some more information about overclocking then try posting in that forum. There are a lot of TechPowerUp users with a lot more experience than I have when it comes to overclocking the Core i7-920.