I have a prebuilt PC Dell Optiplex 9020, which has an Intel Core i7@3.40GHz CPU, 8GB RAM, AMD Radeon HD 8570 GPU and 290W PSU. I want to upgrade my PC with AMD rx 470 and a new PSU. http://www.moddiy.com/products/Dell-OptiPlex-9020-PSU-Main-Power-24%2dPin-to-8%2dPin-Adapter-Cable-(30cm).html...