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Best mobo for 4850 x 2 Crossfire ?

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July 9, 2008 2:26:32 AM

The topic pretty much says it all, looking for advice on a good mobo for running a dual 4850 crossfire rig. Any info/recommendations would be very much appreciated. Feel free to let me know if you need any further info, thanks!

More about : mobo 4850 crossfire

July 9, 2008 2:50:22 AM

Thanks, but I should clarify, I was looking for more of a recommendation for a specific board, not just the type...
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July 9, 2008 11:48:32 AM

RamGuy239 said:
Ehm.. Intel P45 is simply superior to X48, and as 8x / 8x PCI-Express2.0 is far from limiting 2x HD4850 Crossfire performance it's way better to go with a P45 based board!


The ASUS P5Q boards are really nice!



That is a point of some dibate.
Well I would tend to agree with you, there is a set of benchmarks floating around that shows significant drops in performance when switching from a X34/48 to a P45 based Mb. I am of the opinion that it is early driver related but it is hard to tell right now.

And yes, the P5Q series is nice. I would recomend the P5Q-E if you decide on a P45 Mb.
July 9, 2008 11:30:35 PM

RamGuy239 said:
Ehm.. Intel P45 is simply superior to X48, and as 8x / 8x PCI-Express2.0 is far from limiting 2x HD4850 Crossfire performance it's way better to go with a P45 based board!


The ASUS P5Q boards are really nice!



P45's pcie2.0x8 in cf bottlenecks 4850 badly. Cf use more bandwidth, due to the way it's implemented. It is not driver related. Older 3870s cf bottleneck at a lower threshold that's also significantly higher than the threshold of single card bottlecks. Drivers for 3850/70s are already mature.
http://www.tweaktown.com/articles/1472/7/page_7_benchma...

P45 is a mainstream chipset, meant to replace the aging p35, which is soon out of production. X38/48 are meant as performance chipsets aimed at the higher end of the market. They're priced accordingly.
July 25, 2008 7:18:02 PM

dagger said:
A lot of people around the forum use this model, with good results. Specs look good too.
http://www.newegg.com/Product/Product.aspx?Item=N82E168...


this is a great motherboard, i just built a system with it myself

if you are going to bother to spend the money to get 2 4850 cards, spend the money to get the most out of them... the x48 chipset, with the full 2x16 pcie lanes is going to give you noticably better performance
July 27, 2008 11:33:00 AM

although if you are running games on high resolution, 1280x960 or above, having that 16x/16x CF will show some difference in performance. Considering that 22'' monitors(1680x1050 resolution) are becoming the sweet spot for the price, i would still get a board with x38/48 chipset.

Granted, due to the price difference i would say P45 would be an excellent choice if you change your mind and just get 1 powerful card (because early benches showed that a single 4870X2 performs better than 2 x 4870 CF and I believe 4870X2 is on it's way very soon i believe)
!