Try using the 21x multi and setting bclk to 215. Try raising QPI and vcore will need to be in the 1.38v to 1.48v range for 4400Mhz - 4500Mhz depending on your chip unless you got a golden chip. Also, it is really tough to get 4500Mhz 4C8T LinX 20 runs stable. You will probably have to turn HT off to get 4500Mhz LinX stable.
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