***guys, if you do not know the GA-X58A-UD3R , please do not post... *** I have already asked Kingston, they say they don't support my mobo, and won't even answer the question.. it is 10 years old, the main good thing is it is BEFORE intel let SPECTRE in!! I want to add more dimms to my mobo, and would like to know the success of this, before wasting my very limited money.. If I had millions, I would not be here, and buy a 4k monitor, graphics, etc, not much change from 20000... the limit of it is 24G, with six slots.. type is 1.5v DDR3-1600 UDIMM non ecc if you put in three or six, it will increase the bandwidth by 3.. if you put in a multiple of two, it will increase the bandwidth by 2.. If you know what this means in speed/ benchmark it would help, manual does not make it clear.. my main question is, do I need a 'matched pair' (eg 3 sets of 2 x 4g =24) 50 each = 150! or can I just buy 6 Dimms and plug them in?? 20 each = 120! anyone out there know???