ASRock z77 Extreme3 underclocking 1600 MHz RAM to 1333 MHz

joemasterjohn · Jul 3, 2014

I just bought a set of Team Vulcan 2x4 GB 1600 RAM modules and after installing them on my ASROCK z77 Extreme3 mobo I saw that they were being underclocked at 1333 MHz. In the bios I switched to the pre-installed xmp profile and switched the memory clock over to 1600 MHz. After that, the computer booted fine once, but then I would get a message from the bios saying it was unable to boot. I switched back to the "auto" settings and changed the clock back to 1333 MHz and it works fine. Can anyone help me or give me some instructions on what I need to do to properly configure the modules to run at 1600 MHz? I've attached screenshots from CPU-Z for info on the CPU, Mobo, and Memory.

Thanks in advance.

Tradesman1 · Jul 4, 2014

make sure you have the latest BIOS, then enable XMP, select profile 1, then check the CR (Command Rate) and if set to 2T, if still problems raise the DRAM voltage + 0.06 from spec. If still problems what's the actual model number of the sticks.

joemasterjohn · Jul 4, 2014

Tradesman1 :

I flashed the BIOS to the latest version and then enabled the XMP profile and everything is working fine.

Thanks for the quick answer.

Tradesman1 · Jul 4, 2014

No worries, can thank SR-71 Blackbird, he saw the thread and asked me to take a look since DRAM is sort of a specialty of mine, otherwise I maght have missed it, am working on a rig and primarily catching up with PMs

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ASRock z77 Extreme3 underclocking 1600 MHz RAM to 1333 MHz

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