If I recall this used to be a popular buy. Is this still a good bang for the buck combo ($400 ~ $600)? or is it now i7 and some other mobo. Used in conjunction with 9800GTX and GameXStream 700W.
None of the NVIDIA 780i-based boards (save for the EVGA FTW series, but even then...) are as stable as the Intel-based boards. If you're building a complete rig from scratch, go with an Intel P43, P45, X38, or X48 board.
Personally, I'm not a fan of any of the OCZ-based power supplies -- I've heard too many horror stories about them in general. Though the 700W GameXStream model shouldn't give you any trouble with your pending setup, I recommend replacing that PSU as well as the motherboard.
If you have the Q6700 already, go ahead and use it. If not, don't bother; go with the Q6600.
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