Core2Quad Q9550 chipset

[Cadallic]

I have gradually fallen to some of the motherboard that are good and which ones affordable, while I think there are a lot of different chipsets in the market.
I am thinking to have Core2Quad Q9550 processor and expect to have some 12,800 PC-RAM.

I also most inclined to Asus motherboard. So I have 2 questions.
What is the difference between all of the chipset available: Intel x38, Intel x48, Intel P35, NVIDIA nForce, Intel P45???? And what would be a good bid on a motherboard?

[SecRecy]

As far as I remember X-chip sets are designed for if you want to run the crossfire. P-chip sets for if you only want to run with a single graphics card, however, may P45 chipsets run crossfire, but not at full speed on nr2. NVIDIA motherboard is if you want to run with graphics cards in SLI.

[Sebastian.j]

It is true as explained by SecRecy. Save from nVidia's chipset will be named something with SLI, because it is supported.

EDIT:
Remember also that the motherboard will support DDR3 RAM, where it absolutely MUST be DDR3-RAM.
No reason for it to be DDR3 and that they must be as fast?

[Cadallic]

Okay Sebastian.j, I just thought that all newer nvidia chipset supports SLI, but I also learned a little today