What is your PLL at?
If its degrading it must be high volts of something...
Either way and extra 0.02 to run stable at 4.5ghz is still GOOD/AWESOME as if it is only 1.38-1.40 that is the average thusfar for 4.5ghz on decent CPU's.
I did notice yours is a Batch 750 it appears anything over the 435 batch number needs a lot more volts to OC.. but you got a good 750 Thusfar . so its done good and still doing good/ok .. try 4.5ghz for a daily stable OC at 1.39-1.40volts.. temps too will matter of course.
I am willing to bet 750 batch is 4.3-4.4 MAX OC stable 24/7 with good/decent volts.
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