Re: The GPU's specs say, "Minimum 300W or greater system power supply (with a minimum 12V current rating of 20A)." you do not need to upgrade your stock 290w psu.  the PNY spec is just a generic recommendation for DIY build that needs to account for many add on components.  In a prebuild Dell pc you do not need 300w. using on line basic psu calculator, actual recommended psu is Load Wattage:217 WRecommended PSU Wattage:267 W if you add a sata ssd, Recommended PSU Wattage:270 W [IMAGE]basic psu calculator
I recently purchased a refurbished Dell OptiPlex 9020 MT, running Windows 10, Intel Core i7-4770 CPU, 8GB memory, 1TB HDD and I may add an SSD and more memory in the future.  It doesn't have a GPU installed but I have a GPU available to install--it's a PNY NVIDIA GeForce GT710 that doesn't require dedicated power.  The GPU's specs say, "Minimum 300W or greater system power supply (with a minimum 12V current rating of 20A)."  My PC's current PSU has a maximum continuous total of 290W and 14A on +12VA, and 16A on +12VB.  Therefore, it doesn't meet the GPU's minimum requirements. I am looking at the Corsair TX550M PSU.  Would that be suitable?  It has total power of 550W and 43A on +12V. Thank you. P.S.  I don't plan to use the 9020 for gaming but just as a hobby PC.  I'll remove Windows 10 and install Ubuntu and use Python to do ML (machine learning), especially for image/object tracking.  I was hoping the GPU would speed-up training ML models and prevent sluggish script execution when tracking objects.
OptiPlex 9020 MT PSU upgrade for GeForce GT-710 GPU.