Folks, If you have a Retina Macbook Pro that's a few years old, replacing the thermal paste is one of the best, easiest, cheapest and quickest upgrades you can do. It's the best $10 I ever spent on this thing. I got the thermal paste pictured below for $10 on Amazon. See below - the original thermal paste was in awful condition (way too much / all over the place, but had caked and lost contact over a lot of the dies), and when CPU load ramped up, the fans would spool up to top speed (the sound was noticeable). CPU temps got over 200 degrees F, and the GPU got well into the 168-175F range. Fortunately, the heatsink is on the bottom of the logic board - only a handful of T5 screws and it pops right out. Specs: 15" Late 2013 Retina Macbook Pro 2.6 i7 dual graphics (nVidia 750M) 16/500 - this is the highest end model from late 2013, but this procedure should work for any Retina with variations on the heatsink type. Here's the procedure: Shut down your Mac and unplug it Take the bottom plate off (you'll need a Pentalobe 5 (P5) screwdriver) Undo the battery connector (center top of battery) Unscrew the heatsink screws (one on each end, then 4 around the CPU and 4 around the GPU) with a T5 screwdriver Lift the heatsink out on the RIGHT SIDE first (the left side is under a metal edge) Clean the CPU/GPU dies and heatsink with a paper towel with rubbing alcohol - clean the black cover around the dies as well Use some compressed air to clean out the fans and heatsink fins Put a SMALL amount of new thermal paste on each die Spread the paste with plastic wrap over your finger evenly Reinsert the heatsink carefully on the left side first, then attach the edge screws, then the screws around the CPU and GPU. Tighten around each chip evenly, but you can screw each down all the way. Put the bottom plate back on and you're done! Temps didn't go down THAT much, but OMG THE FANS! SO much more quiet doing the same type of thing. Love love love it. FYI: My fans had been blown out recently, so they weren't that bad. Idle CPU/GPU temps are 97-101F, and up to 200/165 under load. Launching VMWare Fusion with Windows 10 build 1903 would spool up the fans to 100% - now it's literally half that and so quiet. This whole thing took 15 minutes.