PSU required for gtx 1070ti 8gb and gtx 960 4gb

Hi Steemians,

I am buying gigabyte g1 gtx 1070ti 8GB and I already have gigabyte g1 gtx 960 4GB.

I currently have corsair VS550 watt PSU. Will this be enough to run both cards or do I need to buy a new one, if I have to replace the PSU which corsair or any better brand would you recommend.

I plan to work as well as game and mine some zcash/ethereum with the setup.

My PC specifications :

Gskills 8GB x 2 = 16 GB RAM

8700k I7 CPU

Deepcool kendoman 5 fans Cabinet

1 WD 1TB blue HDD

1 WD 2TB blue HDD

1 500 GB external usb seagate HDD

1 250 GB SSD

1 old 7200 RPM 160 GB seagate HDD

Corsair k92 gaming keyboard

razer mamba tournament edition gaming mouse

Cooler master Hyper 212 EVO CPU cooler

If I need to buy a new expensive PSU then I wouldn't use the old 960 GTX and sell it, would then I be able to use the new GTX 1070 with the VS550 PSU?

PS : I have posted this question on tomshardware too - http://www.tomshardware.com/answers/id-3611607/psu-required-gtx-1070ti-8gb-gtx-960-4gb.html

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