In the BIOS, configure to 533MHz, is dual channel so, 533MHz x 2 = 1066MHz. In the DDR MEMORY FREQUENCY, select 1:2:1 or 1:2:3...i'm not sure which is it. Only put the memory to 533MHz and your "problem" could be solve.
Also, look at the RAM specs and see what voltage is stated. Set MB to deliver that voltage and it may come up immediately at 1066. Compare the RAM specs on mfg website to what is reported in CPUz in SPD.