Graphics Card says I need a 500w PSU but I only have a 430w PSU!

Dpetkovich · Oct 26, 2014

Hi, so when I bought all my parts I didnt know the Graphics Card needed 500w so I bought a 430w PSU to save money. I already have the parts and was wondering if I needed a new PSU or the Graphics "required" wattage was phony. Thanks!

Oh yea here is my list.

http://pcpartpicker.com/user/Dpetkovich/saved/y6Z9TW

TheDualshock · Oct 26, 2014

Hmm in your list it shows that you have a 750w EVGA PSU, which a good one.
A 430w would be cutting it pretty close considering PSUs degrade a bit over time and if it isn't a quality power supply, it may not even supply a full 430w (depends on Amps on 12v rail).
I've seen people run that setup on a CX430 from Corsair and they've had it work out.

rolli59 · Oct 26, 2014

The card you got will run on a 430 if it is quality (guessing CX430) but it will need 2 x PCIe power connectors from the PSU.

Total system power consumption is less than 300watts here http://www.anandtech.com/show/7503/the-amd-radeon-r9-270x-270-review-feat-asus-his/16

Dark Lord of Tech · Oct 26, 2014

A Radeon R9-270X needs 24 amps on the 12v + rail and a 500 watt power supply with 2 - 6 pin PCIE power connections.

Dpetkovich · Oct 26, 2014

Yea for some reason I didnt switch that PSU out. I do have a CX430. Also another problem that I saw (and some of you pointed out) is that I only have a 6+2 Power connector not 2 6 pin connecter. Can I get a "Y" cable? Or can I order another 6 PCI cable from Corsair?

nikoli707 · Oct 26, 2014

no you cannot get a Y cable. the power connectors are designed to supply up to 150w each(6+2), with 75w through the pcie lane itself. you would likely hit the over current protection on your power supply if you try to use a Y cable. you need a power supply that has at least two pcie power connectors.

rolli59 · Oct 26, 2014

You can use a Molex to PCIe adapter for the second connection. There will be no power protection kicking in on a PSU with a single +12 volt rail!

nikoli707 · Oct 26, 2014

with an fx6300 and a 270x, your definitely going to go over the 32 amps on the 12v rail that your cx430 is rated for.

in all likely hood you will make it too the desktop, but gaming it going to hit the over current protection on that unit.

rolli59 · Oct 26, 2014

nikoli707 :

Not with total system loads under 300watts http://www.anandtech.com/show/7503/the-amd-radeon-r9-270x-270-review-feat-asus-his/16 32 amps means he has 384watts on the 12 volts alone!

nikoli707 · Oct 26, 2014

rolli59 :

i would be very leary about running that. the fx6300 has a 8 amp rating at stock while the 270x has a 24 amp rating. its just not smart to cut it so close, exactly 32 amps with a tier 3 power supply.

ko888 · Oct 26, 2014

You can use one of these since one 150 Watt (6+2)-pin PCI Express power connector supplies the same amount of power as two 75 Watt 6-pin PCI Express power connectors. The +2-pin portion of the (6+2)-pin connector does not carry any power.

http://www.amazon.com/StarTech-com-PCIEXSPLIT6-6-Inch-Express-Splitter/dp/B004NNTVT6
http://www.newegg.ca/Product/Product.aspx?Item=N82E16812200935CVF

rolli59 · Oct 26, 2014

nikoli707 :

rolli59 :

i would be very leary about running that. the fx6300 has a 8 amp rating at stock while the 270x has a 24 amp rating. its just not smart to cut it so close, exactly 32 amps with a tier 3 power supply.

You are simply wrong the 24 amp includes the CPU. 24 x 12 = 288watts and that is R9 290X territory!

And ko888 is right about the splitter, it will work.

ko888 · Oct 26, 2014

The AMD FX 6300 is a 95W TDP processor. Its typical power consumption is 77.19 Watts. That would equate to less than 6.5 Amps from the +12V rail.

An AMD Reference Design Radeon R9 270X 2 GB draws a maximum of 14 Amps from the +12V rail while running Furmark.

How is that cutting it close to the CX430's 32 Amp maximum?

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