This is my first time posting in these forums so i will try to explain what is going on the best i can, the motherboard in the title is what i currently have MSI 760GM-E51 FX, the motherboard says that it supports 1600(OC)/1333/1066, i bought some 2x8gb(16gb) PNY 1600 memory sticks and install them and i get 1 beep and boots up to the point where it says that it is initializing usb..... and just hangs there. I was wondering should the motherboard down clock the memory to 1333? as when it boots up and hangs there, like i said up above, it says the memory is clocked at 1600? i have tried installing both 1 8gb sticks by them self, and i get no hang but the 2 installed together i get the hang at the usb initializing. Also i have another motherboard that is the MSI 785GM-E51 and it also supports the same 1600(OC)/1333/1066 and i installed the new 16gb PNY 1600 in that motherboard and it works. With the MSI 785GM-E51 i have the cpu overclocked so in that system the memory is at 1573 i believe, do not know if this is making any difference as i do not think it would. I am just having a hard time understanding why it will not work with the MSI 760GM-E51 FX but it works perfectly with the MSI 785GM-E51. I am running Windows 7 x64 on both systems. I was just wondering if the MSI 760GM-E51 FX motherboard is faulty with that set of memory sticks cause as i write this i swapped some other memory that i have 4x4gb (16gb) PNY 1333 and put it in MSI 760GM-E51 FX motherboard and it works just fine. If you need the specifications of any of the 2 systems just let me know as i would think that would not matter. The motherboards are similar as the FX supports AM3+ with a bios update and supports up to 32gb of memory as the non FX motherboard only supports up to 16gb of memory and does not support AM3+.