I've just brought the 5590, I use this for my business and run simulations, so i want to upgrade the RAM, but to do this is have too remove the back panel, my concern is this will invalidate the warranty?
There is an extra empty RAM slot available in the Dell Vostro 5590.
So yes you can increase the RAM of your Laptop.
And No, it doesn't void the warranty.
I hope this helps