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Good enough psu?

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March 20, 2013 2:22:42 AM

I have. I7 3770 and a saphire OC 7850

Is this psu good enough? Or am i cutting it close?

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

More about : good psu

March 20, 2013 2:57:16 AM

Are you overclocking your CPU(3770K)? Then you will definitely need a 700 watt or greater power supply. Since it is a high-end processor and your GPU requires a 500 watt power supply with a 6-pin PCIe connector, it is just enough. However this will increase load on your PSU (less headroom) and increase the possibility of system failure.
The Corsair CX750 is an entry level PSU but still 750 watts and with a 80 PLUS Bronze certification like the one you mentioned and has the required 6-pin PCIe connector for your GPU. In fact, four of them. It has mostly good reviews, but it is up to you to choose. If you do not choose that get a 600 watt or higher power supply.http://www.newegg.com/Product/Product.aspx?Item=N82E168...

The 550 watt power supply might just be enough.
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a b ) Power supply
March 20, 2013 3:30:47 AM

Matsushima has no idea what he's talking about. An i7 3770k and 7850 will probably peak close to 300 watts usage, maybe less. The 550 will be more than adequate. Take a look at http://www.anandtech.com/bench/Product/549 . . . Notice on their test rig (which is a pretty beefy machine) the peak usage with the 7850 at the wall was 289 watts, so assuming the PSU they used was 90% efficient then it was actually supplying 260 watts to the machine, which is about half of that PSU's rated 12v line all by itself.

You'll be fine.



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a b ) Power supply
March 20, 2013 4:13:40 AM

^+1 OP (g9672001) is more than safe with the XFX550watt Bronze.

His unit has +3.3V@24A, +5V@24A, +12V@44A, -12V@0.5A, +5VSB@2.5A

Which is sufficint for any overclock and graphics card upto HD7870 or GTX 660

Absolutely noting to worry. :) 
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March 20, 2013 1:22:23 PM

Yes... maybe I did a little overkill. More than enough. But more load on the PSU
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a c 1204 ) Power supply
March 20, 2013 2:36:07 PM

For a system using a single AMD reference design Radeon HD 7870 GHz Edition graphics card AMD specifies a minimum of a 500 Watt or greater system power supply. The power supply should also have a maximum combined +12 Volt continuous current rating of 28 Amps or greater and have at least two 6-pin PCI Express supplementary power connectors.

Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Sufficient Total Combined Continuous Power/Current Available on the +12V Rail(s) rated at 45°C - 50°C ambient temperature, is the most critical factor.

Overclocking of the CPU and/or GPU(s) will require an additional increase to the maximum combined +12 Volt continuous current ratings, recommended above, to meet the increase in power required for the overclock. The additional amount required will depend on the magnitude of the overclock being attempted.

The XFX 550W Core Edition Full Wired (Bronze) (P1-550S-XXB9), with its maximum combined +12 Volt continuous current rating of 44 Amps and with one 6-pin and one (6+2)-pin PCI Express supplementary power connectors, is way more than sufficient to power your system configuration with a single Radeon HD 7870 GHz Edition graphics card.
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March 20, 2013 5:10:07 PM

Thank you all for helping!
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March 20, 2013 9:18:47 PM

ko888 said:
For a system using a single AMD reference design Radeon HD 7870 GHz Edition graphics card AMD specifies a minimum of a 500 Watt or greater system power supply. The power supply should also have a maximum combined +12 Volt continuous current rating of 28 Amps or greater and have at least two 6-pin PCI Express supplementary power connectors.

Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Sufficient Total Combined Continuous Power/Current Available on the +12V Rail(s) rated at 45°C - 50°C ambient temperature, is the most critical factor.

Overclocking of the CPU and/or GPU(s) will require an additional increase to the maximum combined +12 Volt continuous current ratings, recommended above, to meet the increase in power required for the overclock. The additional amount required will depend on the magnitude of the overclock being attempted.

The XFX 550W Core Edition Full Wired (Bronze) (P1-550S-XXB9), with its maximum combined +12 Volt continuous current rating of 44 Amps and with one 6-pin and one (6+2)-pin PCI Express supplementary power connectors, is way more than sufficient to power your system configuration with a single Radeon HD 7870 GHz Edition graphics card.


Yes.
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