Questions about Apple iMac 2020

We would like to upgrade our iMac i9, 3.6 GHz (2020). For the time being, we are looking for 2 x 32 GB RAM components. Which ones would you recommend? Thanks in advance!

Hello Digitec, You write in the specifications that an AMD Radeon Pro 5300 graphics card is installed. According to Apple, however, a Radeon Pro 5500 X graphics card is installed as standard on this iMac 2020? Which one is installed now? :) In the description you talk about the Core i5 processor and in the specs it's the i9? I assume that the 3.6 GHz 10-core Intel Core i9 processor of the 10th generation (Turbo Boost up to 5.0 GHz) is installed? Thank you and LG