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Replacement power supply for system with Radeon HD 4870 CrossFire

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  • Power Supplies
  • Crossfire
  • Components
Last response: in Components
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September 25, 2012 11:10:43 AM

I had my PC custom built 3 years ago. It had an NSpire 750W power supply. That power supply died recently so I got an Antec True Power New 750W (Antec True Power New 750W). When I installed it the computer shut down after 5 minutes. Thinking it was a bad power supply I replaced it with an OCZ ModXstream Pro 600W (OCZ ModXstream Pro 600W). Now the computer shut down after an hour or two. I ran my motherboard's monitoring software and saw that the CPU was overheating. I decided to reset my motherboard bios (the builder had done some mild overclocking) and the CPU overheating problem is now fixed (CPU temperature between 34-41 C for 24 hrs).

So I currently have the OCZ 600W PS and everything runs great. But I am concerned because the builder used a 750W power supply originally. I have also used several online power supply calculators and the recommended wattage is right around 600W or a little above it. So I'm wondering if I should go back to the Antec True Power New 750W or leave things as they are?

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September 25, 2012 11:36:39 AM

Toms Hardware Rules said:
I had my PC custom built 3 years ago. It had an NSpire 750W power supply. That power supply died recently so I got an Antec True Power New 750W (Antec True Power New 750W). When I installed it the computer shut down after 5 minutes. Thinking it was a bad power supply I replaced it with an OCZ ModXstream Pro 600W (OCZ ModXstream Pro 600W). Now the computer shut down after an hour or two. I ran my motherboard's monitoring software and saw that the CPU was overheating. I decided to reset my motherboard bios (the builder had done some mild overclocking) and the CPU overheating problem is now fixed (CPU temperature between 34-41 C for 24 hrs).

So I currently have the OCZ 600W PS and everything runs great. But I am concerned because the builder used a 750W power supply originally. I have also used several online power supply calculators and the recommended wattage is right around 600W or a little above it. So I'm wondering if I should go back to the Antec True Power New 750W or leave things as they are?

The Seasonic built Antec is the better power supply and you would be putting a lighter load on it than the OCZ
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September 25, 2012 7:44:44 PM

Thanks for the feedback. I didn't realize the TruePower New was made by Seasonic. I ended up putting the TruePower back in and think it's a good move even if a little more expensive. My CPU temperature is now around 30 C whereas with the OCV power supply it was around 35 C. The system is also significantly quieter. I'm curious why the CPU would be running at a lower temperature with the TruePower PS. Maybe the fans are running better?
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September 26, 2012 4:30:52 PM

Best answer selected by Toms Hardware Rules.
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