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power supply replacement on a DELL optiplex 755

PPIHXM
PPIHXM asked
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Last Modified: 2016-11-23
I need to replace a power supply, that has become very noisy, on a DELL optiplex 755.  I have a DELL optiplex 745 on hand, that has a good power supply.  They both have the same sized chassis, 'desktop' size.  Do you think it is safe to replace with the power supply from the 745 or would you order a new part from DELL.  It is a very important PC.  The replacement part I found online says 280 watt.   Please let me know what you think.

Thank you!
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Commented:
I think you should compare info on both power supplies and decide
Commented:
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Top Expert 2012

Commented:
The 755 DT http://www.dell.com/downloads/global/products/optix/en/opti_755_techspecs.pdf has a 280 watt power supply, so if it's designed for the 755, it's a good replacement.
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Commented:
If these are the USFF models then the external power supply "bricks" for the two are identical DA-2 Series you can safely swap them and expect the same performance. We do this routinely and have anything from GX620's (!) to 760's running off the same PSUs. The internal PSU's on the desktops work the same way :)

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Commented:
Thank you!  I swapped it out with the one from the 745 and it works perfectly.
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