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Compatible PSU for Lenovo M91p

Posted on 2013-10-28
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Last Modified: 2013-10-30
Hi experts,

I have always had good luck just finding a PSU at Best Buy, which generally fit and worked fine. I got a recommendation for a new PSU for the above computer, which I purchased off the Internet. Suffice it to say, it wasn't even close to fitting.

I am looking for something in the 400 watt range, possibly a Seasonic or Antec. It really doesn't matter if you think it is good quality and will be compatible with the case.

Thanks.

Bert
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Question by:Bert2005
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Expert Comment

by:ltechsolutions
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I assume your M91p is a small form factor...
The ThinkCentre M91p is a proprietary chassis, and you won't be able to use a power supply off the shelf.

You'll most likely need Lenovo P/N 54Y8824. I'd check around - you should be able to pick one up for under $20.
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by:dbrunton
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There are three form factors for the Lenovo M91p.

See http://www.computershopper.com/desktops/reviews/lenovo-thinkcentre-m91p-0266-b8u-ultrasmall-desktop and the diagram quarter of the way down the page.

Which one is yours?

If you've got the one of the small ones chances are that it is a proprietary power supply as suggested by Itechsolutions.
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by:Bert2005
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I apologize for not listing that. It is the largest form factor. Probably why the recommendation from my friend was MUCH too small.

I am OK paying up to $60 or $75. If that would be the right one.

Oh, and thanks for the responses.
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by:garycase
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I don't think the M91p uses a proprietary form-factor.    It appears to use a standard TFX supply.    I can't find a 400w unit in that form factor, but here's a high-quality 350w Seasonic 80+ Gold certified unit:  http://www.newegg.com/Product/Product.aspx?Item=N82E16817151115

Just to be sure, check your current PSU's measurements -- a TFX unit should be 3.3" x 2.5" x ~ 6"  (the depth may vary a bit, but the 3.3 x 2.5 should match).
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by:Bert2005
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http://www.newegg.com/Product/Product.aspx?Item=N82E16817151114

This is the one I bought, and it doesn't fit.
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by:dbrunton
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Can you post the measurements of your power supply?
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garycase earned 425 total points
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Since you have the full tower version of the M91p, I suspect it uses a standard ATX unit (or possibly an SFX unit).    Measure the "end" of the power supply and note the dimensions.

If it's 3.4" x 5.9" then you have an ATX unit.   This would be a good choice in the 400w range:
http://www.newegg.com/Product/Product.aspx?Item=N82E16817151074

If it's not an ATX unit, post the dimensions and we'll find you a good unit :-)
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by:Bert2005
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Will do, thanks Gary. At least I am calling it a PSU and not a battery, lol.
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by:Bert2005
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Definitely the tower on the right. A tip, if you ever want a second DVD, have them install it before they ship it. If you install a 3rd party one, it will install and it will work, but it won't fit flush. You just have to trust me on that one. Sorry, just a bit off the track, lol.
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by:Bert2005
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With direct measurements it was:

Height 6 inches

Width 3 1/2 inches

Depth 5 1/2 inches
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by:garycase
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Sure sounds like an ATX unit.
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