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Does my power supply have enough juice?

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  • Power Supplies
  • Graphics Cards
  • Components
Last response: in Components
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December 14, 2011 12:15:27 AM

I just purchased an EVGA GTX 550 Ti video card and the PSU requirements for it are: 400 watt or greater with minimum of 24 amps on the +12 volt rail.

My current PSU has the following specs: 400watt, two +12 volt rails with 16 amps on each one. I'm not sure how the calculations work, but would these two rails combine to provide enough juice for my video card?

More about : power supply juice

a c 1217 ) Power supply
a c 578 U Graphics card
December 14, 2011 1:06:47 AM

What is the brand and model of the power supply unit?

Does it have at least one 6-pin PCI Express supplementary power connector?
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December 14, 2011 2:32:39 AM

The brand of the PSU is Delta Electronics, Inc. and the model is: DPS-400RB A

This power supply unit is part of the Gateway FX7024 I bought about 3 years ago, and it also came with a EVGA Geforce 8800GT video card (which fried just last night) and this PSU was able to support that. And yes, it has the 6pin connector.
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a c 94 ) Power supply
a c 177 U Graphics card
December 14, 2011 2:47:29 AM

Should be fine. The 8800GT had a power draw of 110W. I just looked online and found an OC'd 550TI that had a TDP of 116. The cards should be close enough that 6-10W won't cause an issue. You might to upgrade your PSU as they don't last forever, but you should be fine.
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a c 1217 ) Power supply
a c 578 U Graphics card
December 14, 2011 2:59:42 AM

The Delta Electronics, Inc., Model: DPS-400RB A label states:

+12V1 & +12V2 COMBINED CURRENT CAN'T EXCEED 30A

Since it's greater than the 24 Amps specified by EVGA you should be fine.

If you were to run FurMark GPU stress testing the GTX 550 Ti may draw up to 142 Watts (i.e. 11.8 Amps from the +12V rails).
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December 14, 2011 3:08:21 AM

thanks so much to both of you for clearing things up! i truly appreciate it.
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!