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Do I need more power?

Etherton

Etherton

Will Bang for Poof
Joined
Aug 7, 2006
Messages
6,996
When I go to add a second EVGA 780Ti Kingpin will I need to change out my power supply as well? Currently running a BeQuiet! Dark Power 10 850w PSU, which I love! They only make 2 above 850w - 1000w and 1250w. I don't want to go overkill, just wasting electricity at that point IMO, but I do want to be safe. I do intend to overclock the system :p

Build:
  • Intel Core i7-4770K
  • Corsair H100i 77.0 CFM Liquid CPU Cooler
  • Asus MAXIMUS VI GENE Micro ATX LGA1150 Motherboard
  • EVGA GeForce GTX 780 Ti Classified K|NGP|N
  • BeQuiet! Dark Power 10 850w PSU
  • 16gb - G.SKILL Ripjaws Series 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800)
  • Intel 525 Series Lincoln Crest mSATA 240GB SATA III
  • 2 - 1.5tb WD Black HDDs
  • LG Bluray drive

Water-cooling system:
  • 10 x XSPC G1/4" to 3/8" ID, 5/8" OD Compression Fitting - Black Chrome Finish
  • 1 x XSPC RayStorm Intel Faceplate - Red
  • 1 x XSPC RX360 Triple-Fan Radiator V3 - Black
  • 1 x Laing DDC-pump 12V DDC-1T
  • 1 x XSPC Raystorm CPU/APU Copper Waterblock - Intel
  • 1 x Monsoon Series Two DDC Premium Dual 5.25” Reservoir - Red
  • 1 x PrimoFlex Advanced LRT 10ft Tubing - 3/8in. ID X 5/8in. OD - Pearl UV Orange
  • 1 x EK-FC780 GTX Classy - Acetal + Nickel GPU block
  • 1 x EK-FC780 GTX Classy Backplate - Black Rev2.0
  • 6 x Corsair Air Series AF120 LED Quiet Edition High Airflow Fan
  • 1 x PrimoFlex Advanced LRT 3/8in. x 5/8in. Tubing (10ft pack) - Bloodshed Red
  • 1 x Koolance G1/4" Brass Inline Drain Valve Fitting - 4 Port
  • 2 x XSPC G1/4" Thread 3/8" ID x 5/8" OD Low Profile Compression Fitting - Black Chrome
 
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850W its the minimum for a regular 780TI SLI Setup, under heavy loads a regular system with a 780TI can draw like 650W.. thats almost 80% of the max capacity of a good 850W PSU without taking into consideration the fully Watercooling setup and you will be using 780TI Kingpin Edition which draw much more power. i would highly consider a good 1000W+ PSU just to be safe and soft with the PSU, specially if overclocking are included into the equation.. you have to remember that none PSU its just overkill, and no matter if you use a 5000W PSU (yes, just a exaggerated joking) it will not draw or waste more power just for that.
 
Should it work and be fine? Yes.

Would I prefer to have abit more headroom? Yes.
 
You don't waste power by getting a larger power supply, you waste power by getting a more inefficient power supply at the load levels you use your computer at. A power supply only supplies as much power as the computer is demanding.

If you have money to burn, go ahead with the 1000 watt, that should be more than enough to overclock your system to the moon. If you plan to drop in another Titan, go with the 1250 watt.
 
Ordered the BeQuiet! Dark Power 10 1200w. Will sell the 850w once I get it and buy a second GPU block for the next Kingpin. :)
 
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