my computer is 3 years old, and as a cpu e3400 dual core and was operating a 32 bit system win7. I have upgraded to win 7 ultimate 64 bit. and put in 16 gig of corsair ram, when I turned the computer on I got a high pitch noise, turn off put old ram back in works ok, takes a while to start up but runs perfectly. done this a couple of times, same thing happens I have been told that this might be a voltage issue so need to change it in bois, but don't know how, also that 4 gig of ram is all the motherboard will take, and it dosent matter if I run 64 bit operating system, or my cpu is capatible for 16 gig of ram any advise please