Bios + Memtest report different timings then CPU-Z

Mother: Asus M2N32-Sli Deluxe (bios 2001)
RAM: Corsair Dominator 8500C5D 2x2gb

My RAM is rated at 1066. In my bios, when I select DDR-800 and then try and clock the FSB up, I believe I hit some memory controller limits and I can only get to about 950 on the RAM before I start getting issues.

When I select DDR-1066 and everything seems fine but I manually input the timings 5-5-5-15 in my bios yet next time I boot into the bios, the bottom of the ram info screen says my timings are 5-3-3-3 even though my manual selections still state 5-5-5-15. Also, when I load up memtest from a boot cd, memtest reports my timings as 5-3-3-3 and my ram speed at 937 or something like that. Yet, when I load into windows and open CPU-Z, it shows 5-5-5-15 1066.

If I manually select 5-7-9-27 as my timings, then the BIOS and memtest display 5-5-5-15. Anybody know why and which settings my computer will actually be using?
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More about bios memtest report timings
  1. You've got an AMD CPU, so there may be some interactions between the "main" CPU and mc settings. Also, I've sometimes seen unusual memory settings reported in memtest86+ with newer CPUs.

    In general, I would trust CPU-Z, but make sure you are looking at the memory tab, not the SPD tab.
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