Do I need more power?

Despinoza · Sep 10, 2014

Hi All,

I was wondering if I need to upgrade my power supply. Here are my specs.
I want to run a flight sim on a 27" monitor at 1920x1080. The monitor is an Asus VE278H.

Alienware Aurora ALX (2009) 64-bit
Intel Core i7 930@2.8GHz
9GB Ram
Nvidia Geforce GTX 760

The power specs as indicated on the label.
Ac input (50-60Hz): 100-240V~/12.5A
DC output +5V/32A, +3.3V/30A
+12VA/18A, +12VB/18A, +12VC/18A, +12VD/18A,+12VE/18A
-12V/0.5A, +5VSB/4A

+5V and+3.3V shall not exceed 225W
+5V +3.3V 225W
+12VA, +12VB, +12VC, +12VD, +12VE Shall not exceed 825W
+12VA, +12VB, +12VC, +12VD, +12VE 825W

Max. Output Power: 875W

Also the VA,VB,VC.....and so on. Are those the voltages per rail.

I pulled this GTX760 spec
"500 Watt or greater power supply with a minimum of 30 Amp on the +12 volt rail."

Do I have enough power?

I would greatly appreciate any help and comments.
Thanks

bignastyid · Sep 10, 2014

If the PSU is capable of delivering stable power it should be more than enough.

prit87 · Sep 10, 2014

you have much more power than required .

Despinoza · Sep 10, 2014

Thanks for the responses. Another question, do the VA,VB, VC and so forth mean the individual rails. Also it says my GPU, need a minimum of 30amps on the +12V rail. Does the GPU draw from multiple rails?

Karadjgne · Sep 10, 2014

825w / 12v = 68.75a. That said, as long as those rails all meet at a common Junction and are not like some I've seen that are separate rails, then yes, you have enough power for any single gpu and 3/4 of the sli/xfire options

Despinoza · Sep 10, 2014

Ok thanks. I should be ok on running my 27" with high graphics?

Karadjgne · Sep 10, 2014

A rail is nothing more than a name for a particular output. Some power suppliers use multiple rails, as they can use smaller, cheaper capacitors, diodes, transistors, mosfets etc, and 18a on a rail is pretty standard. It's just a way to share a larger load with smaller components. This by no means means they always add up straight. Most dual 18a rails usually add to 30-32a, and you have 5 rails pulling 69. This does make the rails more stable and longer lived since no single rail can pull more than 18a at any 1 time before load is shared.

Honestly, you could have a rail burn out entirely, and still have more than enough power to run the pc, gpu and all.

Karadjgne · Sep 10, 2014

The 760 is a little more powerful than my 660ti,and I run all my games on ultra. Granted, I don't play bf4 or watchdogs, but I do play Assassin's Creed 3, Guild Wars 2, Skyrim modded.

The size of your screen means nada. 27" is same as 60" if resolution is 1080p for both. Just means the pixels are larger on the 60", not more numerous. 1080p is the standard resolution nowadays and most gpus are rated for that resolution at least, with the more powerful gpus capable of dual or triple that. As I can't see your flight simulation being more graphics intense than what I run, I'd say you should easily cover high, and maybe ultra or even max @1080p with a gtx 760.

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