With such a variety of +12V readings, from 8V to 14V, your PSU could be contributing to the crashes and overheating CPU. Can you borrow a known-good 650W PSU to test in your computer? Yours might need replacing.
Any time you remove the heatsink, you must replace the thermal paste. From the Arctic Silver instructions.....
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6) Removal from Hardware
Arctic Silver thermal compound can easily be removed from hardware using the proper cleaners and tools: For general clean up, a cloth or paper towel will work well. Intricate cleaning can be accomplished with Q-tip swabs. An old toothbrush can often get the compound out of crevices that other tools cannot reach.
CPU Core: For optimum cleaning use ArctiClean 1 and 2. For adequate cleaning use high-purity isopropyl alcohol or acetone and a bit of careful rubbing. Do not use nail polish remover as it contains fragrance oils and other contaminants. (If you use acetone, do a final cleaning with high-purity isopropyl alcohol.)
Heatsink: For optimum cleaning use ArctiClean 1 and 2. For adequate cleaning use a xylene based cleaner, (Goof Off and some carburetor cleaners) or high-purity isopropyl alcohol. If you use Goof off or xylene based cleaners always follow up with a cleaning of high-purity isopropyl alcohol afterwards.
CPU Ceramic: Use any of the following cleaners: ArctiClean 1 and 2. Any dish detergent. (Dawn, Lux, Palmolive, Etc.) Do not use soap for an automatic dishwasher to clean a CPU. WD-40, citrus based cleaners. Xylene based products. (Goof Off, some carburetor cleaners and many brake cleaners.) Mineral spirits. (Be careful to keep the mineral spirits away from the core.) Once the majority of the compound has been removed from the ceramic, small patches remaining on the ceramic can be 'erased' with a soft eraser.
If you use any of the suggested products besides ArctiClean 1 and 2 to remove Arctic Silver 5 thermal compound from the CPU ceramic or heatsink base, always do a final cleaning with isopropyl alcohol to remove any residue from the cleaner.
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