Should I power MB/CPU with basic PSU to take load off GPU PSU?

[jamesgalb]

I have a rig of 4 RX 580s on a 850w Corsair RMx.  They pull just under 700w from the wall.

Considering I have a spare 450w PSU from an older Dell PC sitting around, would it help my 850w PSU at all if I split off the MB and CPU to the spare PSU? A splitter is under $10.

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[jmigdlc99]

Experience has shown that running your PSU at 80% is the most ideal and efficient in terms of taking care of your PSU and optimal power consumption

Given that you are running at 82% (700/850w), you're probably at a safe spot and need not run a separate PSU. However, i'd go another step and further undervolt your cards a little more. Just to be sure perhaps.

[leonix007]

Experience has shown that running your PSU at 80% is the most ideal and efficient in terms of taking care of your PSU and optimal power consumption

Given that you are running at 82% (700/850w), you're probably at a safe spot and need not run a separate PSU. However, i'd go another step and further undervolt your cards a little more. Just to be sure perhaps.

this is +1, been running 2 rigs at 5xRx480 at 850w, no issues at all though it needs underclocking. also I set them on -20 powerlimits

[Geraldo]

In the current situation, I agree with the suggestion above. Except you want to expand more setting with your cards. With more power space you can expand your cards setting, without worries.