Set the 33 to 28. TRC=Tras+Trp
Now, bear in mind that DDR3 means double-data-rate three, in other words the speed that u see in CPU-Z or the BIOS need be multiplied by two, so, 666.7x2=1333.4 that is the speed of ur RAM.
thank you, I kinda figured it out when I set memory to 1066, and I got 5xx mhz in cpu-z. confirmation helps.