dxgmms1.sys atikmpag.sys BSOD

the i7 970 chip has a 'turbo' feature that gives you basically +/- 200 mhz, this is normal for that particular chip.
Overdrive is still locked so even though it's checked it's not applying any additional properties to the card right now.

At this point I would suggest contacting alienware, as I know they include their own software on their machines and I haven't had personal experience with that software in years, so I can't give you step by step instructions with it.

At this point it would seem the problem is based either with the graphics card itself or their software interfering with the ati kernel and causing the driver to crash. Which of these is the case I can not say based on the information in the minidumps. I can tell you that the error is the same in all 8 of them I looked over though.

As a footnote here is the data on that cpu of yours
http://ark.intel.com/Product.aspx?id=47933

no problem wish I could have found you a resolution.

Honestly you are best off finding a person familiar with high spec gear and having it built for you without any of the extra pre-installed junk on it you get from the large vendors. I'm sure the people here would be quite helpful in helping you order the parts, piecing together a computer is probably not nearly as scary as you think it is, and you'll save at least 30% on cost.