You can for AU$50. See http://rfactor.net/web/rf2/rf2help/
You get one year free with purchase, so a further 2 years is still cheaper.
It is expensive if you compare it with other titles, however unlike other titles, all future content released is provided to you as part of that cost and there is a crap load coming. No purchasable DLC!
Think of it as a precision tool instead of a racing game, pick up some of the amazing mods available and realise the bargain it would be at double the cost.
I've had 3 years of incredible experiences on my own and online, if that ain't worth 3 slabs, well I dunno!
Mate there are heaps of mods for RF2 and plenty of formula 1 from old to new. Their official website even has a 2012/13 era available as well as some of the lower classes of open wheeled. http://rfactor.net/web/rf2/rf2dl/
https://www.cpuid.com/softwares/cpu-z.html is great for watching and logging various temps as well as performance.
Although your pc is relatively new, it's possible the thermal paste was not applied correctly, or cooling system not working appropriately.
Further, I didnt see a note about whether this was online or not? People joining a server can lag things out depending on the quality of server and connection.
Perhaps turn FPS monitor on in game and see if that spikes too. (Check hotkeys for the button)