This gives us a total of $401 (or $313 if go with only 4gb of ram). Thinking of current cost vs value you are getting between the two which would be a better build?
Definites for me only are my power supply (Corsair 650w) and 2x Radeon 5770.
What are you doing with the computer? I assume you're gaming, in which case, I'd say neither.
The X6 isn't that good for gaming (check the review on the front page). You'd be better off getting the X4 955 (assuming it's cheaper). If it isn't, then go with the X6.
Some comments on the rest of the build. OCZ RAM is very hit or miss. Grab this G.Skill Ripjaws 2x2 GB 1600 mhz CAS Latency 7. They're faster and higher quality. Also, 8 GB is overkill for a true gaming build, so just get a single kit for now.
Finally, I wouldn't start a build with Crossfire. Spend the same amount (less with the combo) and get the HD 5850 and Antec Earthwatts 650W . The Antec PSU is as high quality as the Corsair, but cheaper. Or you could spend a ltitle more and get the HD 5870 (combo with RAM), though you may want a 750W PSU if you want to do Crossfire later.
Sadly I am starting with the crossfire as I already bought the 5770 last week. Right now I am just trying to figure out cost wise if it is really worth spending the $200 extra on an i7-930. I am definitely am considering future proofing.
Personally I am a gamer but also use my computer for a lot of watching of 1080p movies and am one of those people who usually has 30+ internet explorer windows/firefox open at one time plus downloading bittorrents while still doing something else...
I just found a M3N78-VM motherboard that I still have...though its not on the list of approved x6 motherboards(all are M4 or better.)
I'd probably go with the X6. The CPU doesn't really affect gaming too much, and the X6 is better than the i7 in productivity. While you may not use the actual productivity apps, it's just indictive of the CPU power. Plus, it's a lot cheaper, which helps in other parts of the build.
On the motherboard, I would personally choose a board that's on the approved list. I definitely would get a USB 3/SATA III board. I don't think there's a whole lot of difference between the 790 and 890 chipsets, so either would be fine.
790 vs 890 has only 2 real differences, PCIE lane expansion in the northbridge, and better larger northbridge to southbridge communications bandwidth. Neither change is necessary at this point, but was probably done to allow better utilization of USB 3.o and SATA 6.0 in the future.
As for your question, um i7-930 OC's better and uses less energy. That's the only advantages I can think of. IMO grab the x6.
Well, considering that the X6 is new (and thus untested), the i7-930 is still a decent choice for reliablity. The i7 holds it's own again the X6, so it's not like it's drastically underpowered. The i7 may even exceed the X6 in some apps, especially if they're multi-threaded (the i7s have 8 threads versus the X6's 6).
In terms of gaming, the i7 comes with the benefit of having a better chipset for video cards than current AMD CPUs. Also, the i7 is still better for gaming, but only if you've already spent the money on the best GPUs you can get.