I have a Dell Optiplex 790 with a GTX 1050ti slapped in. I think it already makes a good computer as is as i'm not too crazy about graphics. However i've got the money this time and I'm deciding whether I should upgrade my CPU or add to my existing 8gbs of RAM. I have an i5 2400 processor with 2 sticks with 4gb memory in each, should I add another 2 or get a new processor asap? (also note if it matters, I have $150 to work with)