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Is a 450W PSU enough for this build?

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  • Power Supplies
  • Graphics Cards
  • Build
  • Components
  • PSU
Last response: in Components
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August 25, 2014 5:01:34 PM

I ordered the components to my new mini-ITX gaming rig last week. I thought I ordered a Rosewill 550W modular and instead ordered a Rosewill 450W modular by accident. I was about to start boxing it up, but then decided to check around just to see if a 450W could cover it.

Unfortunately the NewEgg PSU calculator is way higher than a couple others. I was wondering if they set it artificially high to convince people to buy more expensive PSUs than they need.

Here are the components:

Mobo: ASUS Z97I-PLUS
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

CPU: Haswell i5 4750
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

GPU: EVGA GeForce GTX 770
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Cooling: Enermax Liqmax 120S
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

PSU: Rosewill 450W
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

2 sticks of DDR3
1 "green" HDD
1 SSD

Not planning on OC'ing.


Questions:
1. Will this PSU work?
2. If I try it and it isn't enough, will it damage the components?
3. If it isn't enough, should I go ahead and get a 650W (I just learned today that PSU's don't always draw their max power, doh)
4. If this is enough barely (whatever that means), will it being taxed heavily cause it to "wear out" faster?

Thanks in advance!

More about : 450w psu build

a c 1218 ) Power supply
a c 578 U Graphics card
August 25, 2014 5:26:43 PM

It should work fine.
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a b U Graphics card
August 25, 2014 5:27:21 PM

well I'd take the safe road and go for a 550/600 watt psu.
you can however try it but I think your PC will crash down when your GPU "has to work hard"
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Best solution

a c 1218 ) Power supply
a c 578 U Graphics card
August 25, 2014 5:35:10 PM

The Rosewill CAPSTONE-450-M should be capable of powering that system with the EVGA GeForce GTX 770 running FurMark Stability Testing.
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a b U Graphics card
August 25, 2014 5:36:59 PM

ko888 said:
The Rosewill CAPSTONE-450-M should be capable of powering that system with the EVGA GeForce GTX 770 running FurMark Stability Testing.


what if both the cpu and gpu get stressed? I'm no PSU expert but this seems like a long shot to me
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a c 1218 ) Power supply
a c 578 U Graphics card
August 25, 2014 5:41:26 PM

The Intel Core i5-4570 draws less than 70 Watts at full load.
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August 25, 2014 8:47:26 PM

So after attempting this, I found that it does not work. When attempting to boot, I get a "please power down and connect the pcie power cables for this graphics card". The card has an 8 pin and 6 pin connection. The PSU has a single cable with two 6+2 connectors. I had both of those plugged in.

I also noticed that the GPU called for 42a on the +12 rail. The 450W PSU only has 30-something.

I went ahead and ordered the 650W.
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a c 1218 ) Power supply
a c 578 U Graphics card
August 25, 2014 9:10:03 PM

A Reference Design GeForce GTX 770 Card draws 17 Amps from the +12V rail when running FurMark. During gaming it has a peak current draw of 15 Amps.

For an Intel i7 3.2 GHz 130W TDP processor system a PSU with a maximum combined +12V current rating of 32 Amps or greater should be able to run the system.

For your specific system configuration a PSU with a maximum combined +12V current rating of 28 Amps or greater would run the system.

I have no idea if your PSU is defective and is unable to deliver its full rated capacity.

The GeForce GTX 780 consumes more power and NVIDIA has the same power supply specification as for the GeForce GTX 770 that draws less power.
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August 28, 2014 3:26:36 PM

ko888 said:
A Reference Design GeForce GTX 770 Card draws 17 Amps from the +12V rail when running FurMark. During gaming it has a peak current draw of 15 Amps.

For an Intel i7 3.2 GHz 130W TDP processor system a PSU with a maximum combined +12V current rating of 32 Amps or greater should be able to run the system.

For your specific system configuration a PSU with a maximum combined +12V current rating of 28 Amps or greater would run the system.

I have no idea if your PSU is defective and is unable to deliver its full rated capacity.

The GeForce GTX 780 consumes more power and NVIDIA has the same power supply specification as for the GeForce GTX 770 that draws less power.


I'm so stupid... I received the 650W today and was taking out the 450W and noticed that the +2 part of the 6+2 GPU power connector was not seated properly. I swear I checked the connections several times, but I guess working in a mini ITX case limits visibility enough for something like that to happen. Regardless, I switched out the PSUs because I read that the middle 1/3 output of a PSU is the most efficient. *shrug* I'll be shipping back the 450W for a refund (minus the restocking fee) I guess.

Thanks for the answers!
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