Is my PSU strong enough to power my new GPU or is the GPU broken?

A while ago I bought a Radeon sapphire r9 280x vapour for my computer, when I plug it in the computer won't start. My psu is currently 550w. Put I've seen a PC today in PC world (hp envy 700-230ea desktop) that has a similar card and a much better processor as I have an older i5 and it's only running off of 460w. So what is it that isn't working? The cables from the psu didn't fit in well to the card when I bought it but it was about 6 months ago now so I don't think I can send it back :/ any help please? Thank you

Update 1:
CPU: Intel Core i5 750 2.66GHz
Motherboard: Asus P7H55-V H55 Socket 1156 VGA HDMI Out 8 Channel Audio ATX Motherboard
PSU: XFX TS 550W Fully Wired 80+ Bronze Power Supply

Old GPU: HIS HD 5770 1GB GDDR5 DVI HDMI Display Port Out PCI-E Graphics Card

New GPU: SAPPHIRE VAPOR-X R9 280X 3GB GDDR5

The old one is a single 6 pin for power, and the new one is double 8 pin, and some of the power cables just really didnt want to go in, but nothing looks damaged as far as i can tell
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  1. I hope you didn't force the cords in? you may have plugged the a 4 pin CPU power cable into your card
  2. Please list your computer specification (motherboard, CPU, RAM, PSU model), so we can better troubleshoot this.

    What is the power connector on your VGA? Are there two 8-pin power connectors? One 6-pin and one 8-pin? You need both of them connected.
  3. Murissokah said:
    Please list your computer specification (motherboard, CPU, RAM, PSU model), so we can better troubleshoot this.

    What is the power connector on your VGA? Are there two 8-pin power connectors? One 6-pin and one 8-pin? You need both of them connected.


    Ok I'll update the question as well but here it is :) I hope this helps, thanks

    CPU: Intel Core i5 750 2.66GHz
    Motherboard: Asus P7H55-V H55 Socket 1156 VGA HDMI Out 8 Channel Audio ATX Motherboard
    PSU: XFX TS 550W Fully Wired 80+ Bronze Power Supply

    Old GPU: HIS HD 5770 1GB GDDR5 DVI HDMI Display Port Out PCI-E Graphics Card

    New GPU: SAPPHIRE VAPOR-X R9 280X 3GB GDDR5

    The old one is a single 6 pin for power, and the new one is double 8 pin, and some of the power cables just really didnt want to go in, but nothing looks damaged as far as i can tell
  4. If I got it right, your power supply comes with two PCI-E 6+2 pin connectors. Those shoud work for the graphics card. Make sure you don't mix one of them up with the ATX 8-pin connector.

    ATX 8-pin:


    PCI-E 6+2-Pin:


    I don't think you would even be able to fit them without breaking anything, but check for that, anyways. Try booting the computer with only the CPU, one stick of RAM and the graphics card connected. Unplug the rest. If it works you should get the computer to post, but fail to boot.

    Did you try reverting to the old graphics card, just to make sure everything else still works?
  5. Murissokah said:
    If I got it right, your power supply comes with two PCI-E 6+2 pin connectors. Those shoud work for the graphics card. Make sure you don't mix one of them up with the ATX 8-pin connector.

    ATX 8-pin:


    PCI-E 6+2-Pin:


    I don't think you would even be able to fit them without breaking anything, but check for that, anyways. Try booting the computer with only the CPU, one stick of RAM and the graphics card connected. Unplug the rest. If it works you should get the computer to post, but fail to boot.

    Did you try reverting to the old graphics card, just to make sure everything else still works?


    Thanks for the response.

    Yeah my PSU has a 6+2 pin one and a 4+4 pin one, it doesnt have a solid 8 pin.
    And yes, i bought it ages ago and assumed i just needed a stronger PSU, ive been on the old one since then as i havent had the money to buy another psu yet :/

    I'll try it without everything else plugged in when i get back just to check.
  6. A Radeon R9-280X NEEDS at least 30 amps on the 12v rail and a 550 watt power supply.

    Your power supply has 44-45 amps on the 12v rail and is more than sufficient to run your specs
  7. Danteeva said:

    Thanks for the response.

    Yeah my PSU has a 6+2 pin one and a 4+4 pin one, it doesnt have a solid 8 pin.
    And yes, i bought it ages ago and assumed i just needed a stronger PSU, ive been on the old one since then as i havent had the money to buy another psu yet :/

    I'll try it without everything else plugged in when i get back just to check.


    You mean it has two, right? You can't use the 4+4 for the graphics card, it is meant for the motherboard. I believe you knew that already, it's just that it wasn't clear in your response. You also need both the power connectors on the graphics card to be connected to the power supply.
  8. HE has:
    PCI-Express Connector
    2 x 6+2-Pin
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