Is there a noticeable difference between the 512 and 1024 meter cache of the RAID controller?

Question

RAID

I'm planning to buy a hardware RAID controller, but I have the following questions:
- is there a noticeable difference between 512 and 1024 meter cache?
- is there a noticeable difference between 600/800/1200 MHz processes and 1/2 cores?
In general, I choose between LSI MegaRAID SAS 9260-4i and Intel RAID Controller RS2BL040 - in fact the same thing, BUT !: I read this , it says about the additional fee necessary to enable, in particular, MegaRAID CacheCade, and I don’t understand if it is necessary me, because I would like to use an SSD (if there is any sense from it due to the cache of the controller itself)?
- i.e. Do I need to install a caching SSD if the controller already has a cache?

Answer 1

home tasks - storage of mostly movies (~ 15Tb), photos, music ... and distribution of them by torrent
in the future I will store images of virtual machines, I
plan to buy a battery

Answer 2

What kind of raid is planned?

Answer 3

RAID6