You can post a new crash dump. If I see that there are no further drivers before July 2009, then you for sure have a RAM issue. A module could be defective or it could be a bios setting.
If this is the case, highly recommend visiting the forum of your RAM to make a thread with your specs and saying that all your drivers are confirmed perfect. Ask for tweaking help on how you should set everything.
If RAM is defective, they will also help you with that.
The manufacturers' forums are filled with employees of the respective companies and they're really excellent at what they do. If they can't stabilize the system, they'll replace the memory.