nah, 2333 ram does just fine, everything above that changes ****. It's pure marketing.
Don't fall for that... In fact, most enthusiasts have no knowledge of what they're doing, they see big numbers and buy, whereas most of the time they bottle-neck their own systems... Anyway, RAM doesn't change much, it's the CPU for this game... Too much simultaneous AI calcs... It's like CSGO (also CPU based)... You can have the best VGA in the world, with a not so top of the line CPU your FPS in CSGO will never go above a certain cap.
I believe (and hope that I'm right) that they've tailored their engine properly this time around, and with a bit of tweaking to the code they'll manage to make it perform well even in low-end specs.
Also, remember that the game on shows they've presented it also had performance issues in their own PCs (freezing, mini-stutter, etc.). Just wait a bit and it might get fixed.