Corsair CX500M PSU for GTX 780Ti?

box o rocks · Mar 7, 2014

As the title suggests, I am wondering if this PSU: http://www.newegg.com/Product/Product.aspx?Item=N82E16817139050
is sufficient for this card: http://www.newegg.com/Product/Product.aspx?Item=N82E16814487003

I'd like not to have to buy a new PSU, if possible.

badboyrog2 · Mar 7, 2014

you need minimum 800W psu gold rated from my suggest

Temp max.
95
Cunsumption
250 W
min psu wattage
600 W
power connectors
6-pin & 8-pin

enemy1g · Mar 7, 2014

800W minimum for a single card?...

The 780 Ti requires at the very least, 42A to a 12V rail.

That being said, your current PSU, the CX500M, provides 38A to a 12V rail.

I would highly recommend upgrading your PSU before you even think about installing your 780 Ti.

zeph_yr · Mar 7, 2014

badboyrog2 :

No, you don't need 800 watts to power a single card. 500 watts should work, but the power supply he has doesn't supply enough amps. 42 on the 12v+ rail is required, he has 38. While it might work, it isn't recommended, and it might just fry the card. Upgrade the power supply before attempting.

TheUnknownPC · Mar 7, 2014

A Good 650W+ Should do fine

badboyrog2 · Mar 7, 2014

if he want to go to sli in the futur , yes he need 800W psu , better to prevent and stay safe ... that s the most important
hardware

Dark Lord of Tech · Mar 7, 2014

A GeForce GTX 780ti needs at least 42 amps on the 12 volt rail and a 600 watt power supply.

Here's a Seasonic built XFX at a great price:

PCPartPicker part list / Price breakdown by merchant / Benchmarks

Power Supply: XFX 650W 80+ Bronze Certified ATX Power Supply ($69.99 @ TigerDirect)
Total: $69.99
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-03-07 17:51 EST-0500)

box o rocks · Mar 7, 2014

Hey. Thanks everyone for all the quick replies.
I just found this at Nvidia's site: http://www.geforce.com/hardware/desktop-gpus/geforce-gtx-780-ti/specifications
According to that, you guys are right. I need a 600W min PSU. But... the card uses 250W at full load. Using Ohm's Law that would mean the +12V rails would need to supply 21 amps.
(I=P/E)
(20.83=250/12)
So, my PSU has the +12V current capacity, but doesn't meet the 600W recommendation. I may have to re-think this. The card is going in a Bitfenix Prdigy case with a 160mm-ish space front to back for the PSU.
I have a 750W and a 850W PSU sitting unused. But they are too long.

Dark Lord of Tech · Mar 7, 2014

This Seasonic made 550w will run a 780ti.

PCPartPicker part list / Price breakdown by merchant / Benchmarks

Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply ($59.99 @ Newegg)
Total: $59.99
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-03-07 18:04 EST-0500)

enemy1g · Mar 7, 2014

The recommended amps (42) is to account for your entire system. Your system might not push 650W under full load, but it will likely be more than 500. But you are correct, the most a 780 Ti would draw is around 250W.

Dark Lord of Tech · Mar 7, 2014

The XFX 550W linked above will have no trouble running a system with a single 780ti.

box o rocks · Mar 7, 2014

I'll check that out.

Dark Lord of Tech · Mar 7, 2014

It's a High quality power supply.

Dark Lord of Tech · Mar 7, 2014

They also have a great deal on the 650w version.

PCPartPicker part list / Price breakdown by merchant / Benchmarks

Power Supply: XFX 650W 80+ Bronze Certified ATX Power Supply ($69.99 @ TigerDirect)
Total: $69.99
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-03-07 23:48 EST-0500)

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Corsair CX500M PSU for GTX 780Ti?

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