I purchased a brand-new Dell OptiPlex 9020 Mini Tower, it has an i7 4790, 16GB DDR3 ram, 4x4GB 1600 MHz, Crucial MX500 1TB and Windows 7 Home Premium 64 bit with service pack 1. I have the optional security updates to 2023 so please don't turn this into a "why you should upgrade to win 10/11 thread". The PC only has integrated graphics and I want to upgrade the GPU. My monitor is a Dell Ultrasharp 2009WT 20 inch LCD. it has a resolution is 1680x1050 and a refresh rate of 60hz with a 5 ms response time. What would be the absolute best GPU to pair with this machine? The PSU is only 290 watts so I can only use a 75 watt gpu.