4 12V rail vs a single 12V rail

theDoItYourselfAmeture · Feb 2, 2014

I'm going to get the EVGA Hadron air case, but I don't trust the 500W included power supply to run a gtx 780ti and an overclocked 4770k even thought they say they tested it. so I managed to find another u1 power supply but it has 4 12V rails that all have 11A which total 44 amps (enough to run gtx 780 ti) but would it not work because its divided into 4 rails and I need one 12v rail?

http://www.newegg.com/Product/Product.aspx?Item=N82E16817338055

Dark Lord of Tech · Feb 2, 2014

I wouldn't buy a case like that because your power options are super limited.

Get a case that supports ATX power supplies.

tiny voices · Feb 2, 2014

theDoItYourselfAmeture :

This PSU is trash. Its a low quality Server PSU which is NOT meant for a GPU at all. DO NOT buy this.

geofelt · Feb 2, 2014

Most all psu's are built on a single power generating rail. The 12v1/2/3/4 is an artificial UL safety thing.
The included psu does have a single 40a rail, so you should be good.
Read this review: http://www.techpowerup.com/reviews/EVGA/Hadron_Air/4.html

Love the case. My only concern would be with noise from the psu's small fan.
I would avoid Athena power as a quality psu. It is a tier5 unit:
http://www.eggxpert.com/forums/thread/323050.aspx

theDoItYourselfAmeture · Feb 2, 2014

geofelt :

do you know where i could find another brand u1 psu, i was looking for a wile last night and most of the one's i found were used on ebay

geofelt · Feb 2, 2014

Why do you think you need another brand?
EVGA is a quality company, and they know what is needed for their graphics cards.

theDoItYourselfAmeture · Feb 2, 2014

geofelt :

i want to overclock both the cpu and gpu and several gpu calculators, wile they may not be entirely accurate say that my system needs a minimum of 493 watts and a max of 525 watts, do you think that evga would send me another psu or replace my components (if they are evga) if their psu fails to power a 780 ti and an i7 4770k

tiny voices · Feb 2, 2014

No, there is no chance they will replace components if the PSU fails and hurts them. Not a chance.

theDoItYourselfAmeture · Feb 2, 2014

tiny voices :

how about this psu its tier 3 and 80 plus
http://www.newegg.com/Product/Product.aspx?Item=9SIA24G15W9176

tiny voices · Feb 2, 2014

NO. that is a server PSU not designed to run ANY GPUs. It doesn't even have GPU connectors so you would have to use adapters and WAY overdraw that 12v rail. This will probably fry everything. Stick with the PSU that comes with the case or buy a difference case.

geofelt · Feb 2, 2014

theDoItYourselfAmeture :

EVGA has a good support and user forum. Make a post there and ask if the psu is good enough for what you want.
Calculators are deadly accurate... if you have accurate inputs. Some of which are unknowable.
Like the capacitor ageing factor, or how much voltage is needed for your oc. Haswell capabilities differ by chip sample.
Regardless, the graphics card is THE primary determinant of psu requirements. The graphics card can use a maximum of 300w. 75w for the slot, 75w for the 6 pin connector, and 150w for the 8 pin connector. Most likely less.
Most of the rest should run on 150w.

I think you are OK, but if you are unsure, look for a different case that can handle a standard ATX psu.

tiny voices · Feb 2, 2014

500w will easily run your build. Yes you would be close to the limit with the GPU and CPU overclocked and running 100% usage but that will never happen. During gaming this computer will probably pull 300-400w MAX

theDoItYourselfAmeture · Feb 2, 2014

tiny voices :

alright i think ill change the case

tiny voices · Feb 2, 2014

If you are changing the case, get a 550-650w PSU from Antec, XFX, Corsair (not CX), Seasonic. Anything more than that would be really overkill.

theDoItYourselfAmeture · Feb 2, 2014

tiny voices :

alright ill ask on the evga forums and ill get the case any way.

tiny voices · Feb 2, 2014

http://www.guru3d.com/articles_pages/gtx_780_ti_sli_geforce_review,4.html here you will see that their overclocked x79 3960x at 4.6ghz setup + 780ti only pulled 379w during gaming. You will be fine.

theDoItYourselfAmeture · Feb 3, 2014

tiny voices :

thanks, guss i might stick with this amazing case anyway, might buy their hydro if it comes out soon and run watercooling if it only uses that much power

4 12V rail vs a single 12V rail

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