Asus P5KC and 2X XFX 4850 1GB in Crossfire mode compatible?

Solidpantz

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I currently have a CG5270-BP003 Asus (got it for $186 BNIB) that has a single slot PCI-e 16x in it running an Asus EAH 4850 TOP 512mb that I added.
I am happy, but just got a ridicolous deal on 2 brand new XFX 4850 1GB cards. $85 each =)
I also got an unfinished barebones setup to get rid of this ridiculous case that the BP003 comes with... It came with an Asus P5KC mobo BNIB, Antec 900 BNIB, and a Zalmann cnps cooler BNIB.

My question is this :
Being that the P5KC has 1 PCI-e 16x (blue) and 1 PCI-e 4x (black) and is crossfire certified, will this motherboard run the 2 XFX 4850's in crossfire mode perfectly?

Should I just sell the motherboard and buy a different one that has 2x PCI-e 16x slots with crossfire or will I not notice a difference worthwhile?

I may just sell or return the XFX cards and get a MSI Cyclone 4890 OC and not do anything with the motherboard at all... but I think 2x 4850s will outperform that setup.

Here is the rest of the parts :

23" LCD w/ 1900x1280 res
corsair 650w sli certified cmpsu-tx
q8300 core2quad
Apacer 4x2GB ddr2-6400

what are your thoughts?
 

Well if the OP wanted to use a single card then you were right but he/she is going to use dual 4850's on it and since P35 chipset supports CF @ 16x4x then the performance won't be good as dual 8x/16x
 

Solidpantz

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So which option is best do you think?

Sell P5KC and get a new motherboard with dual 8x or 16x support and run dual XFX 1gb 4850's.

or

Sell P5KC and keep factory motherboard and get MSI Cyclone 4890 OC 1GB
 
$85 each isn't /too great/ for an HD4850. Performance-wise, sure, because the only competitors are the GT240/9600GT/HD4670/HD5670.

If you want, sell the P5KC, keep factory motherboard (assuming 2.0x16 PCI-E), and get an HD5850. HD4850x2 is better than the HD4890.
 

Solidpantz

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My current Asus HD 4850 TOP 512mb can run MW2 max settings 1900x1280 very smoothly. I just want better/faster. I don't think any of the above cards mentioned can manage that.

And I don't want to spend $250-300 for an HD5850
 

Although getting another 4850 will give you a boost but it costs more so getting a 4890 and keeping your motherboard costs less however if you don't have problems running your games then why do you want to upgrade ?