[check the vendors web page and the ram people to see if the ram on there qul list. there not much difference is ram voltage from 1.5 to 1.6 when engineers make specks they make it so that there can be a little wiggler room above or below a speck. you see with the axt power supple speck. i be more worried if the ram not on the qal guild. so that you dont have timing issues or windows corrupting itself over time. (sbe single bit errors).