Thanks everyone for the input (eSp!s0 and G.S Technician).
Just for the record: I got my Asus Maximus Formula (bios 1004) stable (running prime95 in blend mode with no errors for 8 hours) with 8GB of this memory using all "AUTO" settings for the memory timings.
My problem getting stable was that I was slightly undervolting my CPU.
Thanks!
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