[citation][nom]SessouXFX[/nom]Sabertooth 990FX was my first choice, before I sprung for the Crosshair V Formula. Can't knock me for getting a great board for Open Box prices, because that was the only way I was going to get a Crosshair V.As for MoBo's making a difference in how a CPU performs, it's about tweak-ability, or the lack thereof. Crosshair V is simply awesome in that regard. But if you do it wrong, you could end up with far worse performance than realized. I've seen a few posters on other sites dogging the board out, because they didn't have an understanding of what to look for and such. And as such, they resold or returned the board for something else.[/citation]
I think the expectation came from the fact that the HardwareHeaven review used an ASUS 990FX Extreme4 board and it seemed to perform very well on one. Shame it's not in this review, however you couldn't really expect a motherboard to make a huge amount of difference.
[EDIT]ASRock, sorry, not ASUS.[/EDIT]