PSU - as stated before. unless future proof na PSU mo then you might need to check for bottleneck.
Much better if atleast more powerful ang CPU sa GPU of your choice, you don't want to max out your CPU usage while your GPU is underload. ex. 100% CPU, 85%GPU. wlang headroom for other CPU task.
you can check "Will it bottleneck" onn google sa pc build bottleneck calculator for GPU na mag synergize sa current CPU mo.