What power supply should I use for GTX 980 Ti SLI?

[chanwei21]

CPU: intel i7-5960X
Motherboard: Gigabyte GA-X99M-Gaming 5
GPU: Gigabyte GV-N98TG1-Gaming-6GD x2 SLI
RAM: Kingston Predator DDR4-2800 8GB*4
SSD1: Plextor M6E 128GB m.2
SSD2: Adata SX900 512GB
HDD1: WD 1TB Black
HDD2: WD 2TB Blue
HDD3: WD 3TB Green
CPU cooler: H80i
PSU: ???

Can a Corsair RM 850W Gold 80plus run it? or 1000w?

 

[MystoPigz]

Yes, a Corsair RM 850W 80+ Gold power supply can run your build. That power supply is also a nice power supply choice. Although, an Antec 750W High Current Gamer 80+ Bronze Semi-Modular power supply would be fine also.

 

[bignastyid]

Avoid the RM unless you are getting a new RMi. If you are not going to be overclocking a good 850w Unit should work.
http://pcpartpicker.com/part/evga-power-supply-220gs0850v1
http://pcpartpicker.com/part/evga-power-supply-220g20850xr
If you are overclocking you'll want more power
http://pcpartpicker.com/part/evga-power-supply-120g21000xr
http://pcpartpicker.com/part/evga-power-supply-220gs1050v1

 

[chanwei21]

Yes, a Corsair RM 850W 80+ Gold power supply can run your build. That power supply is also a nice power supply choice. Although, an Antec 750W High Current Gamer 80+ Bronze Semi-Modular power supply would be fine also.

So RM750W can also run as well?

 

[chanwei21]

Avoid the RM unless you are getting a new RMi. If you are not going to be overclocking a good 850w Unit should work.
http://pcpartpicker.com/part/evga-power-supply-220gs0850v1
http://pcpartpicker.com/part/evga-power-supply-220g20850xr
If you are overclocking you'll want more power
http://pcpartpicker.com/part/evga-power-supply-120g21000xr
http://pcpartpicker.com/part/evga-power-supply-220gs1050v1

what is the diff for RM & RMi?

 

[bignastyid]

Yes, a Corsair RM 850W 80+ Gold power supply can run your build. That power supply is also a nice power supply choice. Although, an Antec 750W High Current Gamer 80+ Bronze Semi-Modular power supply would be fine also.

So RM750W can also run as well?

I wouldn't suggest using a 750w unit for that setup. A stock 980Ti will use 250w and the cpu is 140w so that's 640w just for the cpu and gpus. The G1s will likely use more power than a stock card, I'd guess they will use ~300w(no reviews out yet so this is a guess), so that 740w not including the sdds, fans and everything else that uses the 2v rail. Plus the RMs aren't very good(cheap caps) they are a tier 3 units(except the 850w) and for a high end gaming rig you don't want anything less than a tier 2. The RM 850w is tier 2 but it costs about the same as a tier 1 EVGA GS or G2.

 

[bignastyid]

Avoid the RM unless you are getting a new RMi. If you are not going to be overclocking a good 850w Unit should work.
http://pcpartpicker.com/part/evga-power-supply-220gs0850v1
http://pcpartpicker.com/part/evga-power-supply-220g20850xr
If you are overclocking you'll want more power
http://pcpartpicker.com/part/evga-power-supply-120g21000xr
http://pcpartpicker.com/part/evga-power-supply-220gs1050v1

what is the diff for RM & RMi?

The RMi is digital and they use higher quality capacitors than the RM. The RMi may not be available yet they were just shown at Computex.
http://www.tomshardware.com/news/corsair-rmi-psu-fdb-fan,29241.html

 

[ko888]

System Power Supply Requirements for two NVIDIA Reference Design GeForce GTX 980 Ti graphics cards in 2-way SLI mode
• NVIDIA specifies a minimum of a 850 Watt or greater system power supply. (Minimum system power requirement based on a PC configured with an Intel Core i7 3.2GHz 130 Watt TDP processor.)
• the system power supply must also have a maximum combined +12 Volt continuous current rating of 60 Amps or greater
• the system power supply should also have at least two 75-Watt 6-pin and two 150-Watt 8-pin PCI Express supplementary power connectors. There are some non-reference design cards that require two 150-Watt 8-pin PCI Express supplementary power connectors (E.g. EVGA GeForce GTX 980 Ti Classified ACX 2.0+, GIGABYTE GV-N98TG1 GAMING-6GD, MSI GTX 980TI GAMING 6G) per card.

Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Sufficient Total Combined Continuous Power/Current Available on the +12V Rail(s) is the most critical factor.

Overclocking of the CPU and/or GPU(s) may require an additional increase to the maximum combined +12 Volt continuous current ratings, recommended above, to meet the increase in power required for the overclock. The additional amount required will depend on the magnitude of the overclock being attempted.

Your CPU has a TDP of 140W so you'll need a PSU that has a higher +12 Volt continuous current rating than what's mentioned above. If you overclock the Intel i7-5960X alone the extra +12V current required can reach 10 Amps or more so you would need to add 10 Amps to the above 60 Amps.

An 850W PSU is the minimum. 750W is insufficient to handle overclocking of the CPU and GPUs.

Corsair RM850i (SKU# CP-9020083)
• OEM: CWT
• maximum combined +12 Volt continuous current rating: 70.8 Amps <===== Sufficient
• six 150-Watt (6+2)-pin PCI Express supplementary power connectors <===== Sufficient
• Full Modular Output Cables: Yes
• Official Intel Haswell Compliance: Yes
• 80 PLUS GOLD Efficiency Certification
• 7 Year Limited Warranty