Ok, so you must have been doing something fairly demanding with it? Video editing? Please explain. For web browsing, word processing, light photo editing you shouldn't have noticed any issue due to only having 4gigs of ram.
Consider this: http://www.digitaltrends.com/computing/new-testing-suggests-pc-games-dont-need-more-than-4gb-of-ram/
Here's a quote from the article: "After benchmarking a few PCs, it becomes quite obvious that RAM has far less impact than most people think."
That applies to Windows, not Mac.
Windows 10 is quite content with 4GB RAM. El Capitan isn't.
In fact while every version of OS X uses more and more RAM, Windows went in the other opposite direction in every version since Windows Vista.
Back to El Capitan:
I don't use my old MacBook Pro for heavy lifting anymore, knowing the issue with the dGPU.
I have multiple tabs in Safari and a couple of documents open? Whoops! Out of memory.
It wouldn't say that it's out of memory, but El Capitan would be very sluggish.
Activity monitor would show memory usage to be 3.85 to 3.90GB.
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