I have a Lenovo Z50 laptop and I play games like NFS and DOOM. I also run some simulations using Octave.
CPU: Core i7-4500
HDD: 1TB 5400rpm
I am looking for upgrading my laptop with reasonable price. the first option that comes to my mind is to increase ram to 16GB or install an SSD or replace HDD with a faster one. the later is not a good idea because of heat and power consumption. Any suggestion?