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My PSU is broken, looking for confirmation on new one

Hello, Tom's Hardware comunity!
My PSU recently broke and I found a new one online, but I need confirmation that it will work with my PC without breaking. My specs are the following:
- Inter Core I5 4690 CPU
- Gigabyte Z87-HD3 Motherboard
- 8 GB RAM Kingston DDR3
- Gigabyte NVIDIA GeForce GTX650 2GB GDDR5 Video Card
- Two fans from the case (Aerocool XPredator x1 Black Edition)
- 1TB HDD Western Digital Blue
- Samsung SH-224DB/RSBS DVD Writer
- Chieftec APS-650CB 650W PSU
I used a program from Asus's website that told me this setup used roughly 500W of power, and my PSU delivers 650. What I didn't take into account was that around 80% of that was used for the PSU itself, leaving me with 520W for the rest of the system.

I have two questions: Firstly, if a components (let's say the Video Card or CPU) is used beyond normal, will it draw more power from the PSU? Because I believe that was the problem.
Secondly, I'm looking to buy a new PSU and I was thinking about a Chieftec GPM 750C, as it delivers 750W and it has 90% efficiency compared to the old one, which had only about 80% or so.

Thank you for your time!
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  1. Best answer
    I think you're a bit confused about efficiency. If a 650W PSU is 80% efficient, it can still provide up to 650W, but when it does that it'll draw around 810W from the wall.

    Chieftec PSUs are pretty bad quality, you should go for a cheap (by cheap I mean low-end XFX or Seasonic, these will still be really good units) XFX or seasonic unit if you can. You'll be fine with a 500W PSU, the calculators only give an estimate and 500W is enough for your system.
  2. Is that cheiftec like a russian built psu? I have never heard of it i would recommend a seasonic or XFX 550 watt psu. If you get a seasonic or xfx i guarantee you will have more than enough power with 550 watts.
  3. Mattib 050 said:
    I think you're a bit confused about efficiency. If a 650W PSU is 80% efficient, it can still provide up to 650W, but when it does that it'll draw around 810W from the wall.

    Chieftec PSUs are pretty bad quality, you should go for a cheap (by cheap I mean low-end XFX or Seasonic, these will still be really good units) XFX or seasonic unit if you can. You'll be fine with a 500W PSU, the calculators only give an estimate and 500W is enough for your system.
  4. Thank you for your responses! The brand Chieftec was recommended to me by a local computer expert. Maybie in his line of work Chieftec works pretty well. I, howerer, knew nothing about PSU's so I went with Chieftec. I shall look up other brands, but I'm still unsure why my PSU failed, as it provided way more power than necessary.

    Thank you again for your time and have a good day!
  5. Dennis Morgovan said:
    Thank you for your responses! The brand Chieftec was recommended to me by a local computer expert. Maybie in his line of work Chieftec works pretty well. I, howerer, knew nothing about PSU's so I went with Chieftec. I shall look up other brands, but I'm still unsure why my PSU failed, as it provided way more power than necessary.

    Thank you again for your time and have a good day!


    Im sure it would be okay for an office pc but for gaming or any other cpu or memory intensive tasks you want something with a little more quality.
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