Because the processor is limited to 2666 on non-Z motherboards (which are the most likely target for people wanting this CPU) and testing above it is overclocking. Changing this will affect results and in some cases might even change the review conclusions.why do you need 2666 results,
3200- CL16 and 2666- CL14, are the same performance. If you include 3200 CL14 that should be reflected in the price, it is not the same price at all.