If you get a crash with all sticks in all slots, it can be either both bad RAM, bad motherboard, or just a timings issue. If this is the case, I'd try running the DRAM timings within the BIOS at Auto, and if you crash after that, switch to setting them what they are recommended for. If you crash after both, just replace both RAM/board at this point so we're sure if warranty permits.
If you however only crash with all sticks in certain slots, it's a bad board.
Regards,
Patrick