So, i bought a Gigabyte GTX 960 "Windforce", i tried to connect it and it didn't fit. After a little bit of investigating the GPU and the case, i realized that the little tabs in the GPU's IO bracket's ends are too big for my case.
Some random Google pic i found of an IO bracket :
Those two right here (right)
I AM going to buy a new case eventually, but i wanted to know if this is an issue that can happen even in modern PC cases.
The one i'm planning on buying is NZXT's S340 Elite or H440 if you're wondering.