It isn't rare for ram to be faulty..
If the one stick works fine, try replacing that slot with the other stick and run your tests. If the other stick still crashes in the knowingly good motherboard slot, then it's the ram. If it works fine.. then try 1 stick at a time in the other ram slot. Memtest can also help determine if the ram is bad or not. It doesn't sound like timings... It's either the one slot, or the one stick of ram. http://hcidesign.com/memtest/download.html