things i do: replace both side panels on the PC case with shade cloth or paper [newspaper etc is fine].
check BIOS options for a CPU voltage setting. if there, lower it 2 steps. it won't affect performance, but WILL lower CPU temps. NEVER use any paste [but this is up to you]. paste has very little impact on temps - itz mainly use for conducting heat more efficiently to heat sink, but my CPUs have always run cooler without gunk on them, also look for a motherboard voltage setting in BIOS, lower it one or two steps and see if it helps
anyway, you get Zalamn grease with that monster. should wotk as well as any other