How do you underclock RAM?

I've purchased an AMD A10 7850K with a Gigabyte GA-F2A88XM-D3HP and 8GB 2400MHz Corsair RAM for my computer. The problem is that the AMD A10 7850K doesn't support RAM at 2400 MHz, so I'm trying to underclock it to 2133 MHz, which is supported. At 2400 MHz, the computer frequently gives BSOD errors, so underclocking is a must. The UEFI, however, only allows me to set the frequency to 1333 MHz, which is way too slow for my computer to function properly, or 2400 MHz by selecting the XMP (eXtreme Memory Profile), which is too fast. Does anyone know how to underclock RAM, preferable with the Gigabyte F2 UEFI?

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