Question I5 2500k, 1070 gtx, what psu?

[topslop1]

How many watt psu would I need for a basic, older I5 2500k rig with 1070 gtx?

I'm not going to be running anything more than an SSD for external accessories, etc.

 

[UsandThem]

A quality 550w unit would be plenty for that build.

 

[mindless1]

1070 GTX TDP is around 150W, you could make due with a high quality 400W PSU, or lesser quality (but still not junk) the higher the wattage rating is, but it never hurts to have reserve capacity and ~550W is often about what you'll find as a good value.

I'd look around for sales and/or rebates to get the best bang for the budget.