Today I got my graphics card and made some place for it in my case, I moved my wifi card some places below which resulted in my wifi speed to literally decreased 10 times.
I tried to repair my drivers, uninstall and installing them again, and even placing it back at the slot where it originally was with no difference.
There is no speed difference between the slots, they are al PCIe 1x.
The max I get on my PC is 2.5 Mbps and my iPad gets in the same room 12 Mbp, I have no experience with network related stuff so I don't know what to do in this case.