Okay, take the sticks of RAM, and plug them one at a time into slot one on your mobo. If DOD crashes with one of the sticks, you know that stick is bad. If it doesnt, then RAM slot 2 is probably bad on your motherboard.
No problem man, if you need any more help, feel free to PM me.
BTW, get a brand like Corsair or Kingston or something that is reputable. Don't get bargain bin RAM, it's usually garbage and fries quickly and overclocks terribly.