Question about AMD Ryzen 7 5700G

In principle, the pre-coating that is usually present on the heat sink is sufficient. However, if this has already been used, the residue should be removed with cleaning alcohol or benzine and a soft cloth and a new thermal compound applied thinly and evenly to the CPU. There are relatively wide options when it comes to pastes. The simplest and cheapest is a silicone thermal paste (white). A little better and just as easy to use is a thermal paste containing silver (dark silvery). There are even better heat conduction pastes, but no more. These are usually liquid metals, but they should be handled with great care. One drop in the wrong place and the mainboard is broken. Possibly even more. Arctic MX thermal pastes are recommended and inexpensive. Thermal Grizzly Kryonaut are sometimes the best and of course more expensive. Noctua thermal pastes are also recommendable, but too expensive in my opinion. At a similar price, I would rather take a Thermal Grizzly.