Dual Gpu's one Psu?

[Thomas1996]

I have an RM750i PSu 750 Watt from Crosair.

So is it possible to power a dual GeForce GTX 980 Ti 's

 

[KeelinTy]

What cpu do you have? Do you overclock your cpu? Are you going to overclock your gpus?
Ill need the full system specs to determine if you need a bigger psu or not

 

[Thomas1996]

I'm not thinking of overclocking atm but it may happen in the fututre. (or not at all)

My CPU is an Inetl(R) Core(TM) I7-4790K CPU @ 4.00GHz

with 16 Gb RAM memory

 

[KeelinTy]

Alright So I ran it through a calculator and did some estimates on my own. You will need a bigger power supply. I would suggest getting a 1000 watt power supply as that will give you room for overclocking your cpu and gpu with mild to low high overclocks (4.7 cpu and like 1400 gpu)

I have dual 980tis and a 4790K all overclocked and it maxes out my 1050 watt power supply when stress testing everything

 

[Thomas1996]

but is there an sullution that i can use the powersupply that i have now to run them dual CPU's

 

[KeelinTy]

No. Even without overclocking, you will need at least a 900 watt power supply

Each card will draw 275 watts under full load if you up the power limit to 110% in afterburner (that way it will run at full boost clock under full load) so that there is 550 watts.
The cpu will draw about 80-90 watts under full load which will be 640 watts. Then you have to add in all of the fans, motherboard, hard drives, ssds, leds, usb devices, coolers and ram.

Here are some issues if you dont use a power supply that can handle it


Bad 3D performance
Crashing games
Spontaneous reset or imminent shutdown of the PC
Freezing during gameplay
PSU overload can cause it to break down

Not to mention depending on the power supply, overloading it can and most cases will destroy the psu and there is a high chance of taking everything else in the system out with it.

SLI psu recommendation for the 980ti is 900 watts but I would strongly advise getting 1000 or higher as that leave room so the psu isnt stressed under full load and allows for some overclocking in the future. If you decide not to overclock, the higher wattage will allow the psu to not be stressed as much, makes it safer and quieter since it would be putting out as much heat to pump the current.