the differences are not darastic though they improved on things incrementally. get out of the 600 series and you can at least entertain the thought of a 45nm penryn.
i would beg to differ on the overclocking ability as well but will admit you risk stability if you get a dud. there are also the dreaded fsb holes where you have to skip lower increments and be forced to clock higher than you planned (luckily it seems to exist on the lower end rather than the higher end).
Theres a decent 650i that will support 45nm processors. Be forewarned that this board has a pretty weak NB cooler, and will need to either have a fan added to it or an aftermarket cooler attached.
i would beg to differ on the overclocking ability as well but will admit you risk stability if you get a dud. there are also the dreaded fsb holes where you have to skip lower increments and be forced to clock higher than you planned (luckily it seems to exist on the lower end rather than the higher end).
I own a 680i motherboard, and the OCing capability is limited. An E8400 refuses to go above 3.3 Ghz stably .
If you plan to SLI two (or more) nvidia cards without overclocking, go with the nvidia chipset. Otherwise, stick for an Intel chipset.
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