I recently bought a new set of ram that was advertised as 2666 but ran at 2133 without XMP. Unfortunately, I then had to find out the hard way that (atleast according to users on the dell forum) my motherboard doesn't have XMP support. I've been trying to find a set of 2x8 gb ram sticks that can run at 2400mhz without XMP. It seems like its a bit of a minefield because most brands seem to advertise their XMP speeds not the base speeds. If anyone could link me a set of sticks that might work, that would be greatly appreciated.