I have both chips and I'm trying to make that decsion right now.
I like the power of a quad but the higher c2d clocks will be nice.
I should have some benches and screenies today.
The bios has alot more options than MFI/Rampage so its a learning day today.
Took maybe 1/2 hour to get my 9550 stable at 450x8.5 where on the MF board I could not get it above 425! Still have to lower a few volts but for the most part I'm happy with 3825MHz