Rendering by nature is Processor specific.

More proc cycles to spare = faster render times. Period

I've got 3 gigs of ram on my boxes, and MR doesn't touch it.

I use the mem for caching realtime playback.

So, yep, faster (more) proc/bus speeds are the way to go for faster rendering.

Here is an article that might also help you in the future if you cant afford a new proc/mobo combo, but you still have a bunch of older boxes laying around not doing anything:

https://www.extremetech.com/article2/...1815797,00.asp