Games suddenly running really slow over one night,

[nico6472]

I recently bought a gaming computer and it has worked perfectly up until now. I was able to run all the new games on ultra with a fps of 45-60. Then suddenly overnight I wasn't able to play my games without them getting really laggy.
I have no idea what is causing this???

Please help me

my setup:

Geforce Gtx 780 6 gb
intel i7-2600 3.40 ghz
8 Gb ram

 

[Hbfin]

See if something else is eating your CPU or RAM from Task Manager (win+r -> taskmgr -> enter or just use Windows search)
You could also check your temps with programs like Speedfan.