2 x gtx 980 minimum power supply

[Flyingfish]

Hi
I have a galax gtx 980 HOF . Im adding another gtx 980 evga classified. At the moment I have a thermaltake 650 tough power . Do I need a new power supply

 

[brispuss]

What is the current system configuration -

What CPU?

What memory?

How many HDD's

How many SSD's

How many fans?

Any extra cards?

Any water cooling?

 

[Alan Caldwell]

Get the same card(i.e Galax GTX 980 HOF) for SLI.

 

[iAboodz]

A good 750W power supply is good enough. But it's always good to have a bit extra. I say go for an 800 or an 850 and you should be stable