You bought unsupported memory.
You should buy memory that is supported per their doc:
I went with the Kingston, works great.
DId you ever get your memory working? I've been having memory problems as well. DId you try turning the voltage up to 1.65v?
I tried upping the voltage with no luck. I ended up returning the OCZ RAM and purchased some from NewEgg (KINGSTON 2G KVR1333D3N9/2). No problems with the RAM since then.
Hey I'm having the same problem with my dp55kg I have kingston memory installed in my computer and when I'm running two sticks it only sees one but whern I'm running two on the same channel it sees it. Could the board have gone bad do i have to tweak?