guys as you can see in the image in the end of this post, I used an online psu calculator to calculate how much energy my system would use excluding the gpus
the result pretty much surprised me: 125w for a pentium 6440, one sata 7200 hard disk, 4gb ddr4 and one kb and mouse usb. Is this correct?

Taking this information into account, and considering that running the psu 24/7 at 100% load might not be a good idea, I think I should get one 750w psu for the 4 970 gpus (around 600w), and one 850w psu for 4 gpus 600w + 125w drawn from the rest of the system. Am I missing something?
psu calculator print screen:
https://i.imgur.com/LUDyDzB.jpg