I could just buy a graphics card so. I have another question, if i buy a 4k 48inch TV will it do the job or do they suck?
It's a 4K TV, which will display in 4K resolution just like a computer monitor. It may be a good or bad depending on the brand and model, just like a computer monitor.
Keep in mind though, that there is not a lot of 4K content yet. Just like when 1080p came out the only thing available was BluRay discs and they cost 20 - 50 bucks each at the time. They were an expensive toy with very little content compared with the previous generation of technology. It is the same with 4K.
In the future there will be a lot of 4K content. Currently, there is not. When there is, it is quite expensive. In my opinion I would not delve in to 4K televisions just yet. If OLED screens are truly on the horizon, then TV technology is about to make a giant leap forward.