While difficult to say with absolute certainty, I feel pretty confident the at least the majority of the dmp files you have attached are indicating memory related errors. While some may be attributable to other issues like hard drive problems relating to Page Faults and PFN List Corruption these can also be related to bad memory so until such time as you can produce a memtest free from errors it would be difficult to guess if there is something else wrong or what it might be.
Make sure when you test the individual modules you do so in all slots just to make sure that your problem is not with the memory slots but with the modules themselves. Also it is best to do your test on a cold platform (machine left off for an hour or so prior to...