What is it that really "eats hardware" when composing and rendering?

I was about to spend some money on a new motherboard to upgrade the processor, but when I see I dont need that you probably saved me alot of money :slight_smile:
This time Im only going to upgrade what I need to get better performance for speeding up the process of bulding lights, which today takes about 30 minutes or so on the Landscape Mountain pack from the learning tab. Thats not long, but it could be faster. I have looked at these packs:

(Sorry for Norwegian text)
https://www.komplett.no/product/824675/datautstyr/minnebrikker/hyperx-savage-ddr3-2400mhz-32gb#technical-details
https://www.komplett.no/product/824675/datautstyr/minnebrikker/hyperx-savage-ddr3-2400mhz-32gb#technical-details