I Will get hate for this- On my Personal Pc I use an odd brand and type
Cooler Master High Performance TIM the white ice set-
Came out back in 2002 and I bought a few we designed for sub ambient temps
The tim was bad a upon release,but some odd thing happened to this stuff with age were something seraded and it got greasy so I tried it and I was getting crazy low = to AS-5 and mx4. the main reason I use it because its last forever its vary greasy and allows me to do what ever I want to my system-case-components and them just stick them back on with out having to reapply everything.