SLI question!

[8bit Chaos]

I was wondering if I SLI two gtx 770's does it mean I need a psu with 84 amps on the 12v rails or do I not add the amps?

[MegaDave91]

What's the rest of your rig? You'll be fine with a 650w power supply. Go for one from Seasonic or Corsair (other good ones, but these two are my favorite).

 

For context, I use 750W for my 780 (250W TDP) SLI rig.

[TheRetiredSlave]

No.

 

Since the GTX 770's TDP is 230W, you probably want a PSU somewhere in the range of 750W (~62 amps on the 12v rail) or greater, though you can technically get away with running them on a ~600W PSU (50 A?) but that'd be cutting it a little close..

[DoubleY]

What's the rest of your rig? You'll be fine with a 650w power supply. Go for one from Seasonic or Corsair (other good ones, but these two are my favorite).

 

For context, I use 750W for my 780 (250W TDP) SLI rig.

All of the following are good brands:

• EVGA
• Corsair
• NZXT HALE Series
• Fractal Design
• SeaSonic
• Antec
• XFX
• Be Quiet!

[8bit Chaos]

I'm not asking about wattage just the amps it's says a 770 requires 42A. So do I add the amperes to together or no?

[WoodenMarker]

I'm not asking about wattage just the amps it's says a 770 requires 42A. So do I add the amperes to together or no?

Scroll up and read @TheRetiredSlave's post.

Amperage and wattage are related.

[TheRetiredSlave]

I'm not asking about wattage just the amps it's says a 770 requires 42A. So do I add the amperes to together or no?

 

The card itself doesn't require 42A, they just recommend a 42A (minimum) PSU for systems that are using a GTX 770 as the primary GPU.. Since their recommendation factors in the power usage of the other components and some overhead, their estimation is quite a lot more than what you actually need.. 

 

Like both MegaDave91 and I said, a 600W or 650W (50-54A on the 12v rail) PSU would be the bare minimum you could technically use.. A 750W (62A @ 12v) is a good choice for dual 770 system, though it's not an issue to buy an overkill PSU.

[totjup5]

750w would be perfect