Studio XPS 9100 PSU replacement

Question

So this is something I find a bit absurd; we have a XPS 9100 that we suspect has a failing PSU, so we order a new Thermaltake 850W unit and replace the one that came with the unit.  The system attempted to start (fans attempted to start spinning) and then promptly stops, with a second attempt some few seconds later.  I assumed that the new PSU was failing under load and got another under RMA; plug in the replacement to find the same thing happening.  Is there something I'm missing here?  In all my years working on computers this is a first, I'm now assuming it has something to do with being a Dell machine.

speedstep · Accepted Answer

Disconnect all power to anything other than the Motherboard and remove any video card.

If it comes on then attach the hard drive, then the optical drive, etc.

looking at a power supply as linear and 12v only and ATX instead of EPS12v is part of the problem.

If the 3.3v /5v rails can put out 225W and the +5VSB is 4Amps then there may be an issue elsewhere.

The combined output on the Thermaltake 850 is only 130W Whereas the DELL W299G is much higher at 225W. instead of 25A 25A its 32A and 30A for the 5v/3.3v rails.

GWMurtha · Answer

That would do it, thank you kindly.  Looks like I need to go back for some basics.

dg27 · Answer

I also have a Dell Studio XPS 9100. Am I understanding this correctly that the DELL W299G is the best PSU for this machine?

speedstep · Answer

W299G is a specific Dell part that you need to make sure you get with wiring harness or it wont work for you.

http://www.ebay.com/itm/Dell-Precision-T5500-875W-Power-Supply-NPS-875EF-00-w-Harness-PSU-W299G-/151779682424

It was used as an example of a part that works.

Corsair CS750M is minimum Recommended.

Corsair CS850M would be suggested for GTX980 video card.

http://www.corsair.com/en-us/cs-series-modular-cs850m-850-watt-80-plus-gold-certified-psu

dg27 · Answer

Thanks for the clarification and the advice. I still have the OEM GPU (AMD Radeon HD 5700 Series), but would probably still get the Corsair CS850M if/when I need a new PSU.

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