How much power do I need for this build?

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Nightman

Nightman

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I'm pretty much done designing my custom PC build, and I'm wondering what kind of PSU I need to power it all. Here are the components.

Processor: Intel Core i5-4670K
Graphics Card: EVGA GeForce GTX 780 SC 3GB
Motherboard: Asus Z87-Pro
RAM: Crucial Ballistix Elite 4GBx2 DDR3-1866
SSD: SanDisk Extreme II 240 GB SATA
HDD: Toshiba Desktop 7200 2.0TB 7200RPM SATA
DVD Drive: LG Electronics Optical DVD Drive
Cooling System: Noctua NH-U14S
Case: Fractal Design Arc Midi R2

I plan on adding a second gpu in the future when the price goes down, and I want to overclock everything. I think that the whole system (including the second gpu) should theoretically use about 700W, and I know that there is an efficiency range, so I would think that 850W should be safe, but I don't know how much extra power the overclocking might use. Can anybody tell me how much power I need (including if I should get bronze, silver, gold, or platinum), and perhaps recommend a specific model? Thanks in advance for any advice.
 
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ko888

The XFX PRO850W Core Edition (P1-850S-NLB9), that you chose, uses Seasonic as its OEM.

The difference between the two models is that the Seasonic M12II-850 BRONZE uses semi-modular output cables and the XFX PRO850W Core Edition (P1-850S-NLB9), that you've chosen, has full wired output cables.

PSUs with full...
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ko888

ko888

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For a system using two GeForce GTX 780 graphics cards in 2-way SLI mode NVIDIA specifies a minimum of a 850 Watt or greater system power supply that has a maximum combined +12 Volt continuous current rating of 65 Amps or greater and that has at least two 6-pin and two 8-pin PCI Express supplementary power connectors.

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.

Make sure that the power supply you buy is Intel Haswell Compatible so that you'll never run into problems with Intel Haswell's C6/C7 low power sleep states.
 
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Nightman

Nightman

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Does this one look good? It's 850W, Haswell compatible, and +12V@70A.
 
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toyftw

toyftw

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Hi - ko888 advised how much power your system needs, but to recommend a specific model, I need to know your location
and budget.The budget $ will also determine what efficiency (Gold, etc) you will be able to select.

 
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Nightman

Nightman

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I live in the States, and I'll probably just order everything on amazon and newegg, because I trust them, but I would try somewhere else if it was a significantly better deal. I don't necessarily have a budget (if it costs more I can just save a bit longer), but lower price is always better, as long as quality isn't compromised.
 
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ko888

ko888

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Seasonic M12II-850 BRONZE
http://www.amazon.com/Seasonic-M12II-850-BRONZE-Power-Supply/dp/B00607JNIM
 
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Nightman

Nightman

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I'm an idiot... I forgot to put in the link. Here is the one I was asking about.
http://www.amazon.com/gp/aw/d/B0045L4BNW/ref=mp_s_a_1_2?qid=1395194921&sr=8-2&pi=SX200_QL40

Yours looks good too, do you think there is any advantage to either one of them, or should I just go for whichever I can get for the lower price?
 
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ko888

ko888

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Feb 18, 2009
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The XFX PRO850W Core Edition (P1-850S-NLB9), that you chose, uses Seasonic as its OEM.

The difference between the two models is that the Seasonic M12II-850 BRONZE uses semi-modular output cables and the XFX PRO850W Core Edition (P1-850S-NLB9), that you've chosen, has full wired output cables.

PSUs with full wired output cables means that every output cable is hardwired to the PSU. For any of the unused cables you will need to find a place to hide the cables so that they don't interfere with airflow within the computer case.

PSUs with semi-modular output cables means that the mandatory cables are hardwired to the PSU and the peripheral device power cables are modular and you only connect and use the cables you need so that you don't block airflow within case or need to find a place to hide the unused cables.

This is XFX's equivalent to the Seasonic M12II-850 BRONZE:

XFX 850W XXX Edition Single Rail Power Supply with Semi Modular Cables 240-Pin 850 Energy Star Certified Power Supply (P1850XXXB9)
http://www.amazon.com/XFX-Edition-Modular-Certified-P1850XXXB9/dp/B008O50WG0
 
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