Motherboard Chipset Guide:

[Elton]

Seeing as I have a bit of extra time, the Buyers guide is practically finished and I can sticky this, I decided to clear up a bit of confusion amongst motherboard chipsets. Bear in  mind this is my personal knowlege so corrections are welcome.

I'll start with the ones currently for sale:

Intel:
X58: Supports up to 4x(+NF200) X16 PCI-E lanes(Crossfire/SLI), compatible only with LGA1366 CPUs
P55: Supports 1 x16 PCI-E 2.0 or 2x X8 PCI-E or a 2X X8 + X4 PCI-E(+NF200)(Crossfire/SLI), Compatible with all i5, i3, and i7 processors that are made for the LGA 1156 socket.
H55/H57: Cannot Crossfire, but has 1 X16 PCI-E 2.0 Lane, supports i3/i5 processors that have an onboard GPU chip, supports all LGA1156.
X48/X38: If you can still find them they are capable of 2-3 X16 PCI-E Lanes(CrossfireX only) and Support all LGA775(C2D/C2Q)
P45/P43: Basically same as X48/38 except it does 2x X8 Crossfire instead of X16, supports all LGA775
Nvidia 9400/9300/8200: Supports most LGA775 processors, has it's own integrated GPU, also for ION and has 1 PCI-E X16.
G43/G45 The Integrated intel GPU version of the P45, it has 1 PCI-E X16 2.0
Nvidia 780i/790i/750i:The LGA775 boards that have the NF200 chip and support SLI, the 750i supports 2x SLI in x8/x8 mode, the 780i supports 3x SLI in x16/x16/x16, and the 790i has DDR3 support.

AMD:
790FX: 4-way Crossfire capability, newer ones support DDR3 supports all AM3/AM2 processors. Up to 4 PCI-E X16/X8 slots
790GX: 2-Way Crossfire with Hybrid Crossfire, new boards supports DDR3, supports all AM3/AM2 processors. 2x x8/x8 PCI-E 2.0 for Crossfire
790X: AM2/AM3 board that supports Crossfire, new ones support DDR3. Same as 790GX boards without the integrated GPU.
785G/780G: AM2/AM3 boards that have integrated Graphics, has 1 PCI-E 2.0X16. No Crossfire. May not be able to support 140w processors. 785G supports DDR3. Also supports hybrid crossfire.
770: Vanilla chipset, has 1 PCI-E X16 2.0 slot, may not support 140w Processors, AM2/AM3 compatible.
SLI Chipsets:
780/980a: Support for Tri-SLi, 3x X16 PCI-E 2.0, supports most AM2/AM3 processors, the 980a supports DDR3 and all AM2/AM3 processors.
750a: SLI Chipset supporting only 2x SLI, x8/x8 PCI-E Configuration, supports most AM2/AM3.

That should be it for the ones on sale. If there are any more additions that are needed, either tell on thread or PM me.

[Dr. Nick]

H55/H57: Cannot Crossfire, but has 1 X16 PCI-E 2.0 Lane, supports i3/i5 processors that have an onboard GPU chip, supports all LGA1366.

It's 1156 not 1366.

[Elton]

Thanks, I knew I had some typos and such...Gonna continue this.

[Dr. Nick]

Cool. An AMD version would be useful.

[Elton]

Cool. An AMD version would be useful.

Finished.

[raserei408]

Very nice list.

[Dr. Nick]

Cool and thanks!

[Andy]

785G is DX10.1 and has support for DDR3, it can also have more than one PCIe 2.0 slot, i'm sure it's crossfire capable

[raserei408]

But the crossfire is x16-x4, which isn't very good.

[Elton]

I think it's only hybrid Crossfire, the X16(x4 electrical) is for expansion cards.

[raserei408]

Well technically you can run Crossfire in the two slots. It's supported by the chipset. That said, I'm pretty sure you'd hit a bottleneck.