HOW MUCH POWER DO I NEED? PLEASE HELP

[RamboArsenal]

Hey,

 

I recently ordered the parts to build my pc. When opening and looking through my NVIDIA GTX 970 manual, it requires a minimum of 500W power supply for the whole system. I bought two of these cards and intend to run them in SLI. PCPartPicker estimates I will need about 550W, yet when I spoke with NVIDIA's customer support they recommended 700-800W. I currently have a Corsair RM 650. How much power will I need overall? Thanks!

 

Build: 

• CPU: Intel Core i7-4790K 4.0GHz Quad-Core Processor 
• CPU Cooler: Corsair H105 73.0 CFM Liquid CPU Cooler
• Motherboard: Gigabyte GA-Z97X-GAMING 7 ATX LGA1150 Motherboard 
• Memory: Corsair Vengeance 16GB (2 x 8GB) DDR3-1600 Memory  
• Storage: Crucial MX100 512GB 2.5" Solid State Drive  
• Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive  
• Video Card: NVIDIA GeForce GTX 970 4GB Video Card (2-Way SLI) 
• Video Card: NVIDIA GeForce GTX 970 4GB Video Card (2-Way SLI) 
• Case: Phanteks Enthoo Pro ATX Full Tower Case  
• Power Supply: Corsair RM 650W 80+ Gold Certified Fully-Modular ATX Power Supply  
• Operating System: Microsoft Windows 8.1 (OEM) (64-bit)  
• Monitor: BenQ GW2765HT 60Hz 27.0" Monitor  

 

[Fate]

RM650 is enough.

[WoodenMarker]

Your current psu is fine. Psu recommendations are often inflated to cover their butts. 

[C0LL0SS0S]

650W will be enough, but maybe get a 750 just the PSU is more chilled

[seabass9990]

I dont have an answer but i can tell you if you put all your parts into pcpartpicker it will tell you how many watts u need

[mansoor_]

Nvidia customer support is more accurate, remember that you are not aim for your psu to have just enough power, you want it to run around 60% for peak efficiency. 

[Mao_Zedong]

A 500w pus would be fine, but a tiny bit iffy. 650w is plenty for triple 970s if you want an upgrade. The 970 really doesn't use that much power, generally less than 170w under load.

[AlwaysFSX]

Your current psu is fine. Psu recommendations are often inflated to cover their butts.

Because some people skimp on their power supplies

<--

[spwath]

Nvidia customer support is more accurate, remember that you are not aim for your psu to have just enough power, you want it to run around 60% for peak efficiency.

No they are not... They over estimate. 650is more than enough

[BLCT]

750watts is good enough, you still space for some growing room.

[tedz10f]

I use a tool that is found here 

http://www.extreme.outervision.com/psucalculatorlite.jsp

I think personally a 650W would be fine, my current build uses a evga supa nova 650g fully modular and never browns out, and is utterly silent.

[Tech_Dreamer]

650 is actually good enough , unless you want to upgrade to a platinum grade for anywhat difference you need to make, reason is that regardless the TDP the system recommendation says it should have , real world performance your system (your setup) is actually pulling less tan 500-550 watts max from the wall at the peak performance so the more power labeled ones are actually useless for your build except looking mighty cool & it has been tested, Hope this helps you out..