It isn't too good for idle stock temps.. Load temps would probably be around 55 or so and that doesn't leave much headroom for an overclock. Apparently, there's a pretty big variation of quality in e4300s so some are just as good as Conroes without the extra cache while others are crippled like this. I would try lapping it like the other guy said and some people also put their Zalmans facing the wrong way so make sure it's blowing towards the exhaust :P.