I am almost finished the Arctic Silver 5 i got last year and I would not get it again if I had a choice. I know it sits around the middle in cooling with any other good thermal compounds. The only thing about MX4 that i know for sure is it is non-conductive. This is what I need for mt Radeon HD 6870 that needs to be cleaned. The last time i used it the GPU was over 90°C in Borderlands 2. Back in May 2013. Plus I am considering deliddng my i5 3570k that i am no using at the moment. So what to get???