HD 7970m heat, Termalpaste ?

what the guy says above is false theres a big diffrence in certain pasts from how easily they spread to there thermal conductivity the better the thermal conductivity the better it transfers heat to heatsink

The best paste for laptops hands down is mx4 paste

due to 1 itsnt hard to spread even
2. higher thermal conductivity then most market pastes
pros its cheap

now 5.3 is the thermal conductivity of paste you mentioned

mx4 paste is 8.5 i used this paste for a older laptop hitting cpu temps of 71c this has dropped it down to a massive 50c

note you shouldnt just apply this stuff on gpu it

should be cpu and gpu this is because it lowers overall heat inside the case

my advise
take out the heatsink cpu and gpu and give it a good clean
with isopropyl alcohol 99 percent and a microfiber cloth and use coffee filters for drying it off get it nice and shiny also clean out and remove the fan inside your laptop so you can get at the grill clean that out and blast the fan internally with can of air.

now go to the cpu and gpu chips and clean of with iso alcohol and dry of with filters get it good and shiny and then apply mx4 paste a pea size ammount on each die spread evenly with a plastic gift card so you can not see the shiny surface anymore

then reattach heatsink and tighten in screws or pins in this order 1 and 3 and 2 and 4 a lil at a time so this doesnt make the heatsink off balance.

this paste needs a few days to settle i find as my temps after applying were 58c then dropped to 50c after a week of use