Hello, i have 2x2gb 1066mhz ram in dual channel and i added 1x1gb of 400mhz ram. Cpuz shows i'm still running in dual channel mode and Dram Freq is still at 533mhz so does it means i'm still running them at 1066? 533*2=1066?
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Yes, CPUz is correct. DDR = "Double data rate." Also, mixing speeds can do all sorts of odd behavior.
In addition, your overall performance will be hugely impacted mixing 1066 and 400 MHz DDR ~ 40% slower.