I have a P7P55D Pro motherboard, with http://www.corsair.com/_datasheets/TW3X4G1600C9DHX.pdf
ram. An i5 750 at 3.33 (20 x 166). The ram is kinda old so 1.8 is needed for 1600 so i just stuck with 1328 at 1.65v. on CPU-z it says 666.X but on PerformanceTest, it says its running on 1066 mhz. I trust cpu-z but just a little confused because performance test said 1066.
Thank you for helping.