# PSU for GTX 1070

**URL:** <https://forum.zcashcommunity.com/t/psu-for-gtx-1070/21488>\
**Category:** Mining\
**Created:** [September 15, 2017, 7:28am UTC](https://forum.zcashcommunity.com/t/psu-for-gtx-1070/21488 "2017-09-15T07:28:06Z")\
**Posts on this page:** 1\
**Showing post:** 12

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**Author:** ![1Noob1Rig](https://avatars.discourse-cdn.com/v4/letter/1/bcef8e/32.png) [@1Noob1Rig](https://forum.zcashcommunity.com/u/1Noob1Rig)\
**Post date:** [September 20, 2017, 11:25pm UTC](https://forum.zcashcommunity.com/t/psu-for-gtx-1070/21488/12 "2017-09-20T23:25:55Z")

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> [@gungriffin](#):
>
> a reputable 550 watt PSU will give 550 watts to the computer. Probably more. But it will pull more than 550 at the outlet.

Define reputable 550 watt.  
Let say some how there is a vender that magically allows 80% efficiency at 100% load.  
That’s 550/0.8=687.5 W from the wall.  
How can you pull 20% above the output and still operate safely? Please provide a vendor manual, I have to see it to believe it.

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