Currently I have a gts 250 wich is obviously EXTREMELY old. I have about 300$ to spend right now, I was thinking of buying a completely new gaming pc when I saved enough, but I was wondering if I could just upgrade the pc that I have right now. And i'm worried about power supply stuff because I have no clue about that, I took a look at my current power supply, and I got the model, its a SL-500A with the capacity of 500W.