i am not so sure that fast ram helps that much.
some new-ish 1151v1 pentium G 4560 or analog, with single channel ddr4 stock speed memory will run game just fine. There were no good tests posted about how ram speed affects sim speed.
just some trusted people guessing that after a certain point, with very fast single core performance CPUs you will need to also worry about RAM speed. witch is actually correct for many tasks including gaming, not just supcom. For AMD you are often more limited by memory-system performance, so for AMD (FX, R1,R2) , overlocking ram just increases overal performance and not some magic about supcom.
For supcom just need to choose any modern CPU with good single core performande per price value, Intel's overclokable i3s look tempting for supcom. but ofc ryzen has gigantic multicore performance advantage over those for the same price.
used ryzen 1400, 1600 are already very cheap, if you already have some old intel PC or intel PC with pentium/celeron/old i3, you may just upgraide it with some high single core performance i5****k, i7, i7****k or xeon if that option is available.
if aliexpress works good in your area AND you for some reason want more than 16 gb ram for your supcom PC you can get xeon e5-1620 (only v1, v2 is not overclokable) or xeon e5-1650 v1 or v2, chinese mobo, 16 or 32 gb very cheap ddr3 server ram in dual or quad channel and overclock it to 4.0-4.2 ghz, and you will get around 190 CPU. 1700+ setons is playeable with this CPU, but already close to being fairly slow, but very often not slowest. (by default you can OC only up to 3.9,to overclock CPU to 4.2 you need to buy expencive mobo or buy regular one and swap for bios that allows overclocknig, there are many russian guides about that
, there are also cheap dual channel models appearing that also do overclocking up to 4.2 )
viewtopic.php?p=165158#p165158 some other topic
Edit: also ryzen 2200G, 3***g look to be interesting for supcom since you don't need powerfull GPU for supcom... (depending on your taste kinda...)