P55 for Crossfire 5870s?

[ramble235]

I'm in the early stages of planning my 2nd build and this question has been hard for me to answer:

If I use a P55 mobo, will I be able to crossfire two 5870s to full effect? I'd have just one now, but add 2nd in 1+ years.

The only reason I care about using the P55 is to pair with I5-750 CPU. But if the answer to the question above is negative, then I'll consider using AMD 965 instead with a x16/x16 mobo. Or third option of i7 and X58 board. Cost is a factor, but so is future proofing since this system will need to last 3-4 years.

Speaking of X58, is triple channel memory alone worth the added cost? For the extra gigs, 6 vs. 4? Plan to use Win7 64bit.

Oh yeah, this is gaming build. Monitor is 1920 x 1080.

Thank you for your help.

Rob

 

[brennon7]

PCI Express And CrossFire Scaling: Is P55 Good Enough? Toms article

http://www.tomshardware.com/reviews/p55-pci-express-scaling,2517.html

They use up to 3 5870s

Skipping to the conclusion

Yet, even though our motherboard of choice( for the x58) is slightly slower than many others, its dual-GPU CrossFire configuration provides 4% better performance than the P55 with identical graphics.

You will gain 4% using an i7 x58 setup in crossfire. Is it worth it? You decide?

 

[ramble235]

Well damn, now I feel stupid. Answered the question in spades (its not worth it).

Thank you