iMac 21.5 late 2012

I have an iMac 21.5 end 2012, intel 2.7ghz core i5, 2x4Go ram and fusion drive with 128go ssd and geforce gt640m 512mo.

I use only web, mail, finder and photos.

Your advice about OS ?

And

What must I change ? Ram ? SSD ?

Thk

submitted by /u/Quirky_Selection8148
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