I have my MacPro 5,1 12 core/2.66 (Dual Xeon X5650) which should be running memory at 1333. When I got the machine it had two 1 GB sticks of 1066 running in slots 4 and 8. I have since replace them with 1333 4GB in those slots. All of the other memory is 1333 4GB stick. I should be at 32 GBs running at 1333, but I am running at 1066. Any thoughts on how to reset the memory? I have done the Command Option P R thing, but did not get a different result. Is it possible one of the sticks is bad or mislabeled?