990fx, 990x, or 970?

[Andriko_08]

Hi, I am expecting to be upgrading to bulldozer soon, and I'm not quite sure which kind of motherboard to get.

I will overclock and I will have 2 5870s in crossfire

Do the chipsets give anything else other than pcie lanes?

 

[beenthere]

Yes it's X16 x 2 vs. X8/X4 and an extra PCI slot and SLI of course is activated on all 990 chipsets.

http://www.nordichardware.com/news/69-cpu-chipset/42174-amd-bulldozer-series-9-chipset-detailed.html

 

[abekl]

You want the 990FX chipset. It only costs a few dollars more, but it's worth it in the increased functionality you get.

 

[Dngrwtch]

I know its an old thread, but I have to note that according to the specifications the PCI-E slots on those mobos are set up like this:

990fx - x16,x16,x4 (dual x16 for Crossfire/SLI)
990x - x16,x8,x4 (x8 x8 for Crossfire/SLI)
970 - x16,x4 (x16 x4 for Crossfire/SLI)

Not 100% sure about the 3 way Crossfire/SLI, but I think its something like this:

990fx - x16 x8 x8
990x - x8 x8 x4
970 - N/A

-- Personally I would suggest the 990FX as well. You can geta really nice BioStar 990FX mobo. Thats only ~$30 more than the 970 series mobos, and you get so so much more.

(Biostar 990fx mobo link - http://www.newegg.com/Product/Product.aspx?Item=N82E16813138341)