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HT link frequency is a little high. I'd start there. Temps are IMO, on the edge. Deneb's teeter around 55c. Get it under 50c.
Well dropping the cpu multiplier did not change the HT Link Frequency, but it seems the 3.9Ghz is just what the doctor ordered up. Dropping the multiplier did remove some heat by lowering the overall cpu clock so that took the cpu below the teetering cpu heat spot. Luck man.
RGone...
The HT Link frequency will not overclock very much with stability on that series of CPU. Best to adjust it so as to keep it between 1800 and 2100 mhz. Lowering it from stock somewhat will have no real negative effect on performance. Stock is 2000 mhz. Usually, the adjustment is a multiplier where 10x would be the stock setting. Yes, if your HT Link is exceeding about 2100 mhz it may be causing instability so cut it back. It is tuned to the system bus so when you increase the system bus the HT Link gets bigger. That's the problem. So cut it back manually if it has gotten too big.