Hmm... I don't see it in the Crosshair IV compatibility list. That doesn't mean it isn't. There is a mention of a "Team" model in the manual but that is a 1600Mhz version. RAM compatibility has been an issue on these new boards. The Crosshair IV seems to have the largest compatibility list but still... I've also read that the X4 965 pre C3 version CPU had RAM issues, that is why I got the new revision C3 CPU. I know this is not your CPU, the point is that it is perfectly possible that the RAM even if not defective is not compatible with your CPU or Mobo. Now they have the memory controller in the CPU.
According to this, your CPU has been supported by the mobo since BIOS 505. So it is not likely that to be the issue. Is there a chance that you got one with an earlier BIOS? I don't know... but doubt it.
I would *guess* that it is a RAM compatibility issue. Try to get a refund and try some other brand like G.Skill or Corsair with a model listed in the mobo manual.Edited by i0n - 6/21/10 at 7:39pm