Overclocking Ram as easy as one button?

[Ahhlong]

Hi. I recently decided to overclocked my DDR3 Cosair Vengence Pro 1600Mhz to 2133Mhz on a i7-4790k ASUS Maximus VII Formula motherboard. So what I did was just go into the UEFI turn off XMP and put my RAM frequency at 2133Mhz. And I ran Prime95 and Windows Memory Diagnostics for an hour with no problems. But when I checked my RAM speed using Speccy it showed up as 1066.5Mhz which times 2 is 2133Mhz and my bios showed 2133Mhz as well. But when I go into Windows task manager or ran the code in CMD wmic memorychip get speed, it showed up as 1600Mhz... So which is the real speed here? Did I successfully overclock it? Is there anything else i need to tweak?

[Crunchy Dragon]

Usually you just have to change the RAM frequency in the BIOS.

[DocSwag]

speccy shows as 1066.5 because that's the actual speed of the RAM. You have DDR3 RAM; the DDR stands for double data rate. This means the actual clock speed of the RAM is 1066 MHz but in every clock cycle the RAM sends data twice, making the "effective" clock speed of the RAM 2133 MHz. I'd guess that it's more likely that Windows is just being stupid. Windows misreads clock speeds a lot.