Sorry it took so long to reply; yes, it does a bit of time to make sure everything is compatible.
Here is the link for the 'Recommended' power requirements for running crossfire with 2 x HD5850's, Corsair suggests a minimum of 950 watts, but this is just the basics (2 x GPU, Core i7-930 CPU, 2 hard-drives, slightly overclocked on both CPU and GPU)
There is another person (in the 'Computer Help' forum that's having problems with his P6X58D Premium motherboard, http://forums.cnet.com/5208-6122_102-0.html?threadID=389700&tag=forums06;forum-threads)
Here is an alternative to your choice: ASUS Rampage II Extreme http://www.newegg.com/Product/Product.aspx?Item=N82E16813131352#spec
(this board will run crossfire or SLI, and comes with a SupremeFX X-Fi Audio Card), here's the ASUS link to have a real good look at it
Computer cases are of a personal choice; you want to make sure that the case you choose will: a) fit all the components you have bought. b) be easy to work with-don't want a nightmare causing case, that's a pain in the **** to fit components into. c) will have great airflow. d) If your running a 'gaming' system, then you'd sooner have a case that is black inside (with a window), but don't want to have to break the bank to have one.
When you click on the link for ASUS, download the QVL list for memory, this will list all the memory that is compatible with this motherboard.
Note: Not knowing what your budget is for this system, I had to guess that you wanted to have a system that is: a) upgradeable b) reliable c) won't break the bank account d) will last more than a year or 2.
So I am planning on building a new gaming desktop. It is going to have a I7 930 with two crossfire ATI 5850s. I just need someone to help me confirm that all parts will work and are compatible with one another.
Here are the parts:
Full Tower Case: http://www.newegg.com/Product/Product.aspx?Item=N82E16811124121
Power Supply: http://www.newegg.com/Product/Product.aspx?Item=N82E16817139006
Graphics Card (two of them in crossfire): http://www.newegg.com/Product/Product.aspx?Item=N82E16814131351
Harddrive: it is going to be some ssd/hd combo thats gonna have win7 boot up in the ssd.
First off, will there be any compatibility issues with this configuration and will I have any problems putting it together?
Second, are there any unnecessarily expensive items that I have included? By this I mean the motherboard. Can I buy a cheaper mobo that also has LGA 1366 with at least one 6gb/s sata port and supports crossfire?
Third, does the power supply have enough wattage to support the crossfired 5850s and I7 930 with both overclocked? And will it have enough amps at +12v to support the crossfire?
Lastly, thanks so much to whoever deals with this question. It's a pain to go through all the configurations and check them. I have already done all the research and double checked and they all seem to work out. But I am inexperienced and want to make sure everything is compatible.