OK, so I have a homebuilt machine with an Intel DP45SG motherboard and 4GB of Patriot DDR3-1333 RAM. Recently, the motherboard burned out, and after a long fight with Intel over whose fault it was (you can guess how that turned out), suffice to say I am in the market for a different motherboard.
My question is: Will my existing DDR3-1333 RAM work in a motherboard that's only listed as supporting DDR3-1800/1600 (such as this one)? Or is my RAM going to have to be 1600 or higher?
I've heard that if your RAM is a higher clock speed than the board supports, the RAM will still work, just be slowed down by the board. I don't know if it works the other way around or not. Anyone who can enlighten me is much appreciated.
I was looking at the ASUS P5Q3 (specs here). Figured that if I have to get a new board, I might as well go for a slight upgrade while I'm at it. I just don't want to do that only to find that my existing RAM won't work at all.
Alternatively, I guess I could just choose another board that does list support for DDR3-1333, but thought at least having the capability for the higher speed might come in handy if/when I add more RAM.
That also begs the question: At some point in the future (assuming I can get the board issue to work out), if I was using my existing two sticks of DDR3-1333 and added two sticks of DDR3-1600, is that going to cause problems as well? Or am I better off just going with ALL 1333 memory or ALL 1600 memory?
Usually, you would want matched memory. As for compatibility? Usually, boards list the maximum speed supported. I've never seen a board that supported DDR3-1600 but not DDR3-1333 or DDR3-1066 for example. You should be fine with the P5Q3.