I have a late 2013 iMac - 2.7ghz Core i5, 1tb 5400rpm HDD, 8GB DDR3 1600 Ram. Rather than spending a fortune on a new iMac I am looking to upgrade it and I guess my options are to get 16GB RAM and upgrade the HDD to an SSD. I don't use the Mac for anything particularly intensive but would just like it to be a little 'snappier'. So, I am looking firstly at what would make the biggest initial improvement compared to cost. I know from previous experience of changing the HDD in my iPod Classic to a Flash drive that I should not be allowed anywhere near an Apple product that needs dismantling so any internal changes would need to be done by a professional. In the UK the costs seem to be: 16GB (2x8GB) Ram £172 + fitting £107 = £279 Samsung Evo 850 500GB £188 + fitting £107 = £295 (The drop from 1TB to 500GB would not be an issue as my current HD has only got 208GB used.) So, as you can see, prices are crazy, and I don't have a lot of spare cash! So, would I realistically see value in getting the RAM upgraded - as I sit here typing I seem to have 3.02GB free and I have not noticed it dropping to low levels during usage. I am sure I could find the actual SSD cheaper but then I would have to fit it myself but from research everything indicates that installing my OS on an SSD would make a big difference to the Mac's speed so that may be worth the cost, but would there be a noticeable difference in performance if I just got the SSD and installed it in an external enclosure and booted from that? If I got an external drive I would put everything on it - OS, Applications, iTunes etc and it would basically be a full replacement for my internal drive, so I guess I could then use the internal drive for purely data storage. So many questions and so much typing, but I guess it can be stripped back to 1. Would it be worth spending £279 to increase RAM from 8GB to 16GB? 2. Would it be worth spending £295 to replace an internal 5400rpm HDD with an internal 500GB SSD? 3. Would there be any difference in performance between an internal SSD or an external SSD? 4. Are there any issues around booting from an external SSD instead of an internal one in terms of updates etc? I would love someone to just tell me that RAM won't make much of a difference and an external SSD would be the best option but am open to suggestions. Any and all advice appreciated, I am just a 'casual' user and not particularly technically minded but can certainly deal with installing an external drive, but an internal one strikes fear deep into my heart!