I found this used i7-4770k on ebay for $169 U.S. I currently have a i5-4690k. Would this be a good upgrade? and would it work on my Motherboard? I plan on upgrading my 4 1/2 year old 550W PSU to one of these 650W PSU's. I also want to upgrade my GTX 750ti to a GTX 1660ti or better GPU.