After reading up on several different forums and the likes of it, I concluded that the i7 4970K processor would be compatible with my H87 chipset.
It was recommended that I updated the BIOS with a download from the Intel site.
I did however not find a motherboard called only H87, but H87-PRO and H87-PLUS.
Naive as I was, I bought the new processor and downloaded the update.
I now only get an error trying to update, saying it's not compatible.
I can't find a page on the Intel site only for the H87 motherboard.
When I use speccy, it only says "H87" there.
So, here I am with a brand new processor that I don't even know if I can use. Any advice guys?