if you don't have the manual go to ASUStek and download the memory "qualified vendor list" in the downloads section, there's an A, B and C configuration option, they don't mention anything about single sided or double sided memory, they do say that you can occupy all the slots running two pairs of dual channel; two dual channel kits, or matched vendor pairs, one pair in blue and one pair in black; as long as each pair is matched in size you should be OK.. They also say you can run 1 stick in any slot, in single channel memory mode, and two sticks in the blue slots or black slots, as single pair/dual channel...

Anyway, if it's not the dust, or the memory configuration, you should test one stick at a time with memtest; the log is indicating that the memory in slot 0 is giving one consecutive error; so start with just that stick first...