Originally Posted by Scorpion49
The [H] found that an i7 firstname.lastname@example.orgGhz was severely bottlenecking tri-sli 580's, so I guess you're even worse off. They gained about 20-25% performance by switching to an OC'd 2600k.
Also, its Quad-SLI. Quad-fire is for AMD cards
I've gone back and forth with this myself as I am in somewhat of a similar situation as you. In my findings, what the current Sandy Bridge platform lacks in bandwidth, it more than makes up for in overall raw CPU power - especially the higher the overclock. This is the article that Scorpion is referring to:
It's quite enlightening and really highlights how insignificant bandwidth becomes in the grand scheme of things. The reality of it is that Fermi's (whether if by design or by overhead from the drivers) really require heaps of CPU power in order to really unleash their sheer power.
Even if you could overclock the hex-core 990X to around 4.5GHz, clock for clock SB is faster and many can overclock farther garnering even more performance. In my opinion, if you can cancel your order, I think your money would be better spent on overhauling and moving on to the SB platform. You may even end up saving some money in the end.