open to suggestions

ok, so I have just got an alienware 18, and does anyone know a really good free game to play? I like games that are somewhat realistic (i.e. simulator,powder toy all tht stuff)

My pc specs: processor: Overclocked Intel® Core™ i7-4930MQ processor (8MB Cache, up to 4.3GHz w/ Intel® Turbo Boost),

OS: Windows® 7 ultimate 64-bit, English

RAM; 32GB Dual Channel DDR3L RAM at 1600MHz

hard drives:512GB mSATA Boot + 750GB SATA 6Gb/s (7,200 RPM)

video cards: Dual NVIDIA® GeForce® GTX 780M with 4GB GDDR5 - NVIDIA SLI® Enabled
:D my steam name is FEGELEIN all caps
I've heard good things about World of Tanks although I have never given it a look myself.

it is definitely a good game, (I've had it for a while) and the graphics are very nice for a ftp game. It is very realistic, sort of a mix of a simulator and arcade game. if you like it, I recommend war thunder. it is pretty much world of tanks, but about ww2 planes instead. however,both are very contered towards pay-to-win. thanks!