Ram underclock problem and QTDDTOT

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Sorry to use you guys as tech support but I can't figure this out for the life of me. No amount of google seems to help either.

I had to completely disassemble my pc and put it back together because I screwed up a critical BIOS setting and it wouldn't even POST. Now after 2 days of work I've managed to put it back together and working, recover my files and make a dual Ubuntu/Win10 installation.

The things is as long as the PC is on, it runs like a nigger, I can do anything as long as I don't turn it off, just suspend or restart to change to the other OS and it hasn't crashed a single time.

However, when it cold boots, it seems to roll a dice and has about a 50% chance not even POSTing. Sometimes it displays an error about a failed boot and tells me that my ram is running at 1333 Mhz. My ram is designed for 1600 Mhz so I figured this underclocking is causing the issue, but for the life of me I can't get the BIOS to just use the fucking 1600 Mhz. I've tried manually setting the base frequency and multiplier and enabling xmp, neither worked.

Any ideas? The board is a gygabyte one. The ram sticks are kingston ddr3 8gb @ 1600 mhz blue ones. The bios only displays "UEFI dualbios".

Also, let's turn this into a QTDDTOT.