Best setup for cache location?

Hi all, I'm wondering if moving my cache will speed up my editing workflow and timeline playback at all. Here's what I have going on right now:
I'm editing with FCPX 10.1 on a late 2013 iMac, i7 processor, 16GB RAM, 256GB SSD, 4GB Nvidia GPU. My footage is on an external 2TB via USB 3 (720p .MOV files, about 900GB for this project). Right now, it's a 5400rpm drive, but it will eventually be swapped out for a 7200rpm. I don't own my footage drives, they get traded out between me and my boss on a per-project basis so I can edit for him from home. At the moment, my cache is located on my internal SSD boot drive along with my applications and project files of "Libraries". I am also aware that maxing out my RAM to 32GB is the easiest way to boost performance, but at the moment that is a fiscally difficult upgrade until later this year.
Here's my question: I have a spare 250GB SSD sitting on my desk in need of an external enclosure. I am thinking about purchasing a USB 3 enclosure for it, and keeping my cache there, separate from everything else. Will this give me a noticeable boost in speed?
Thanks!

Storing the cache on the same drive as my media is contrary to everything I've ever read on the subject. My question pertains to whether or not my cache should be kept on my solid state boot drive with my events library, or on an external SSD.

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