Re-check your RAM card installation. Read motherboard manual.
Example, in youtube video, installing 2 x ram kit in blue slots (DIMM_A1 + DIMM_B1)
Check you have identical ram cards.
Which motherboard model you have ?
Help. I have tried change my forum avatar past month using gravatar... it not update here.
I had just now again change avatar in gravatar page, so can someone help update in here after few hours so it will work ? (smoking duck face)
In new CPU's, those have nowadays a lot "power safe" modes which limit CPU to work full speed (GHz).
You maybe need look more of those settings and perhaps disable some from BIOS. And check also Windows Power safe settings.