I've increased the FSB to 331Mhz, lowered the multipier to 11.5X, changed the memory divider to 2.66, memory voltage to 2.0V & core voltage to 1.325V.. At these settings 3.8Ghz was achived & stable.. I've run stress tests & benchmarks & it was completly stable.. Iam running on th F8 bios.. I think there is a more recent beta available..
In my opinion, its not at all worth to buy a new GF 8400GS.. I've used it becoz i was bit tight on cash & this card was lying there as a spare.. I havent tried playing blueray or HD content on it.. So no idea of the performance & cpu usage.. If you are intending for media purposes, then i'd suggest that you shud go for a HD4350 or if you can sapre a little more then a HD4670.. Both can handle HD conent easily & the latter one can handle most of the games also with some eye candy at moderate resolutions..