Hi Nursemorph, initially the pc specialist software suggested a 550w power supply but in the end it would delay the build so upgraded to the 650w and so felt that was covered, will look again , motherboard haven´t really researched so will go back and look at that again, thanks ! have upgraded the cooler since original build and although it is is not the newest I have checked multiple comparison reviews that all state it performs just as well as the newer and more expensive ones at the expense of being more noisy, the logic was to take the best 240mm cooler to save also upgrading the case as the expense is running away with me . Everything I researched about rendering until now has put emphasis on the number of cores the processor to speed up the rendering process so that´s why am fixated on 3950x as has 16 cores, I have very little experience on the hardware side of things so really do appreciate all input and advice, this order can still be amended and the build wont start for 5 or 6 days so there is still time to change things around.Honestly? Your fixation on the 3950x means you have an unbalanced system....putting in a very high-end CPU and then just shoving in the cheapest power supply makes no sense to me...that's like buying a Bugatti and then opting for a Ford Fiesta engine! You've also got an old motherboard isn't really suitable for that chip, a slow hard drive and an old cooler. Basically, you have sacrificed on the basics of the build purely to get a CPU in that may not even work anywhere near it's capacity due to the rest of the build.
At the end of the day it's your money....I just hope you don't spend the next 10 years being disappointed with it's performance because you chose to ignore the advice you asked for. As to the 3070, I would be surprised if that power supply managed to power both the CPU and a 3070