I have a Tbred A 1700+ and it isn't a great overclocker, as I have to go up to 1.6v to even get it to 10x166=1667MHz. But anyway, my Ram is just some crappy Crucial PC2100 that won't do 166, so is there any difference between running at 12.5x133=1667MHz, or 10x166=1667MHz if the memory can only do 133?
