I've run a max of 36 toons on my conputer, and I only have 16gb ram- Was no lag @46fps average.
The core of my build:
i7-5930k cpu (6 cores, 12 threads 3.5ghz, modest OC to 4.4)
15gb ddr4 2800 quad channel (quad channel is the most important, its double the bandwidth of dual channel)
asus rampage 5 extreme motherboard
corsair hx1500i psu
samsung 850evo ssd
Everquest really doesnt benefit from anything over 4 cores. (high diminishing returns here, if i must be specific) So if I were to use the 5960x cpu, I'd see less performance since it is only 3.0ghz. Having the extra half a ghz with less cores heps more since the first 4 cores are faster, and I have 2 left over to handle things like the isboxer client, ventrilo, chrome, siriusxm, etc.
Now, video card doesn't matter so much with this game. Using isboxer, it splits the windows to fit anyways. I use an evga gtx750 ti ftw. with 36 toons open, I always got a steady 40-45 fps. if I had (and I will be getting on cyber monday) a gtx 1080, i would see 60-70fps im sure.
Bandwidth is the most important factor here. if I went to 32gb of ram I'd see no improvement. The files are being handed off before the memory even fills up with 16gb. 30-40% memory usage at peak.
Efficiency is more important than numbers you can impress your friends with. I see what others have posted in here and I've been shaking my head with the builds some have come up with. We're not working in the GM R&D designing new 2018 vehicles, so we don't need $4000 machines here.
With that said, to your original question- You will be fine with that setup if you have ddr4 quad channel ram.