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GTX 670 second power supply use

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March 10, 2013 12:30:10 AM

Hello,
I just bought a gtx 670 and a cooler master 700 watt power supply. I heard you have to trick your motherboard to let the 670 run off the better power supply. Anyone know how to do this? My PC is the Alienware x51.

More about : gtx 670 power supply

March 10, 2013 1:20:54 AM

I should clarify. I want to use the 700 watt solely on the video card, separate from the rest of the pc. The rest of the pc is using it's own supply. I saw on youtube a guy got a 680 to work with this setup. He mentioned you have to jumper the motherboard or somesuch. However he did not say how this was done.
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March 10, 2013 1:24:47 AM

Im confused. Why do you need two power supplies instead of one good one?
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March 10, 2013 3:39:28 AM

The 700 watt is to power the video card by itself. The alienware x51 power supply is only 330 watts, not enough to power the gtx 670. The gtx 670 requires minimum 550 watts.
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March 10, 2013 3:43:40 AM

So why don't you use your new PSU with your system.. no point in doing this even though it's possible.
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March 10, 2013 3:47:35 AM

Confused as to why you need to do this? A 700w will power any single GPU system with ease, unless I'm missing something?
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March 10, 2013 3:51:32 AM

Because the Alienware X51 is a small form factor prebuilt case, it won't fit regular PSUs.

@the1566
It's pretty simple to do like the Overclocker's tutorial explains, but I don't know how to operate the 2 PSUs together (in order to run the GTX 670 with the start of the PSU in the original case), for the GTX 670, you just plug the PCIE connectors, close the circuit on the PSU, power it on from the built in switch or make an external switch like he did.
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March 10, 2013 3:52:13 AM

Seems easier to just replace the case, does it not?
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March 10, 2013 3:52:26 AM

cookybiscuit said:
Confused as to why you need to do this? A 700w will power any single GPU system with ease, unless I'm missing something?

My thoughts exactly.
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March 10, 2013 3:56:45 AM

Now you can either, like cookybiscuit said, replace the case or just buy a SFF psu. Since you already bought the PSU you should just replace the case since it will allow for upgrades in the future and the ease of use. If you aren't willing to replace then you COULD do what the person did in that tutorial though I would not advise it.
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March 10, 2013 3:56:59 AM

cookybiscuit said:
Seems easier to just replace the case, does it not?

It doesn't, such motherboards are BTX MOBOs, it won't fit in normal cases. I/O shield is different too.
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March 10, 2013 3:58:05 AM

High Quality SFF PSUs are rare to find, maybe on ebay or similar sites.
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March 10, 2013 4:05:13 AM

@ilysaml

How do I close the circuit on the psu?


I tried plugging the pci connector into the motherboard directly initially, since that's what the original power supply goes into. System wouldn't turn on. My guess is the alienware x51 was designed specifically for low power brick psu's.
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March 10, 2013 4:06:20 AM

Not like I purchased an Alienware... L0L. You don't have much options here, "ghetto mod" the PSU (using 2 PSUs like you said), getting a new case is not possible. Can't get a new PSU unless you look hard enough and even then there won't be any (MAYBE a few) that are high enough wattage to drive the 670.
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March 10, 2013 4:07:29 AM

I should mention that this particular cooler master psu also has all other connectors built into it. It may not want to work unless the big 10 or 12 pin motherboard connector is connected to something.
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March 10, 2013 4:11:42 AM

the1566 said:
@ilysaml

How do I close the circuit on the psu?


I tried plugging the pci connector into the motherboard directly initially, since that's what the original power supply goes into. System wouldn't turn on. My guess is the alienware x51 was designed specifically for low power brick psu's.

Unfortunately I just found out that it uses External AC Adapter, like a laptop battery not a SFF PSU inside.
You close the circuit by connecting the black and green wire like in the tutorial with that small wire, you maintain it like this, then you plug the power cord into the PSU, and you can switch it on/off with the built in switch, if your PSU has one. That's all I know about turning it on/off, i don't know how you'll reach the connectors on the GTX 670 from outside to inside and I do not know how to power the mainboard if it doesn't have a 24pin connector. I assumed that the board has places for regular PSU connectors but it doesn't. Try google for info and wide help with that
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March 10, 2013 4:18:02 AM

I'll look into closing the circuit. As for google, the search continues. I'll see if I can contact the guy in the youtube video for help. Thanks for the suggestions all.
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March 11, 2013 12:53:23 PM

I closed the circuit on the power supply and that was all it took. So this issue solved. Thanks everyone for your help.
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!