I have a PC with 8 GB + 8 GB + 8 GB of RAM. It has been sufficient for both Windows and Linux, but I believe that upgrading to 32 GB of RAM would enhance my overall experience. I have two options: I can purchase an additional 8 GB RAM module, which would give me a total of 32 GB (8 GB + 8 GB + 8 GB + 8 GB), or I can buy a 16 GB RAM module, resulting in a configuration of 8 GB + 8 GB + 8 GB + 16 GB. What do you recommend for Qubes OS?
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The memory will sum up to the total of memory modules.
However, for maximum performance, depending on the mainboard, memory should be identical by pair / three slots / four slots (4 channel is for high end systems).
Mixing memory will work, but will give poor performance compared to having identical memory modules by 2/3/4 pairs. This will allow more memory though.
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In addition to what Solene mentions, try to find out the speed and part number of the installed modules. You could install dmidecode in dom0 and run sudo dmidecode --type 17 | less to get this information. It would be a good idea to get an identical part.
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Go with 32GB for maximum performance especially if you have lots of qubes to open. Good luck! 
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