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Need help finding a PSU for Optiplex 780?

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  • Optiplex
  • Components
  • Quad Core
Last response: in Components
August 6, 2014 10:58:53 AM

Hey everybody. I have an Optiplex 780 MINI TOWER.
It has a 305 watt psu and is currently powering a 750 ti and a e8400 3.00ghz.
Im buying a q8300 quad core cpu, so i need to know...

-Can a 305w PSU power a Q8300 stock and a 750 ti?
-If not, what is a good, cheap, psu i can buy?
-Would this be a good choice? http://www.cputopia.com/psu-replace-400-p-dell-780-mini...

Thanks everyone.

More about : finding psu optiplex 780

August 6, 2014 11:03:56 AM

As with any dell case, their power supplies are often proprietary or they are a weird form factor shape..with only a few connectors. I cannot comment on that one replacement as lord only knows what brand that is or any sort of quality with it. 400Watts would certainly be enough power..but I couldn't find anything on that model specific to its PSU sizing/requirements. If it doesn't fit a standard PSU format then your options are limited to dell specific replacement power supplies or offbrand 3rd party ones probably from china.
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August 6, 2014 11:07:29 AM

vagrancyx said:
As with any dell case, their power supplies are often proprietary or they are a weird form factor shape..with only a few connectors. I cannot comment on that one replacement as lord only knows what brand that is or any sort of quality with it. 400Watts would certainly be enough power..but I couldn't find anything on that model specific to its PSU sizing/requirements. If it doesn't fit a standard PSU format then your options are limited to dell specific replacement power supplies or offbrand 3rd party ones probably from china.


Thanks. Did you look at the link? Would that one suck?
And also, do you think i would be able to squeeze by with the 305 watt i already have?
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August 6, 2014 11:09:45 AM

e8400 has 53 watt tdp and q8400 has 77 watt tdp so not much of a difference in power consumption so you can stick with your old psu if u are already running the card on it.....and no dont go with that psu u have provided if u want to upgrade your psu then go for this one...
http://www.amazon.com/EVGA-80PLUS-Certified-ATX12V-100-...
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August 6, 2014 11:11:18 AM

I don't know who makes that so I'm really not sure..you could always check to see if dell sells any replacement PSU's for that model that are higher.

The Q8300 has a max TDP of 95w whereas the e8400 has a max TDP of 65watts. It might be cutting it close..but you might be okay.

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Best solution

August 6, 2014 11:12:59 AM

Why not a new case too? I do not remember the particular of this system, but Dell has a annoying habit of using proprietary PSU's for their builds.

Btw, what MB does it have? something along the 45 line and ddr2 800/ddr3 1066?
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August 6, 2014 11:25:34 AM

Bluemoon_9 said:
Why not a new case too? I do not remember the particular of this system, but Dell has a annoying habit of using proprietary PSU's for their builds.

Btw, what MB does it have? something along the 45 line and ddr2 800/ddr3 1066?


im sorry, i dont know what that means. All i know is, i can run a 750 TI and an e8400 on it with no issues.
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August 6, 2014 11:29:39 AM

I wouldn't advise to upgrade to a dead end. What is ur budget and what is the intended system use?
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August 6, 2014 11:31:50 AM

Bluemoon_9 said:
I wouldn't advise to upgrade to a dead end. What is ur budget and what is the intended system use?


It's for gaming on medium settings. My budget is as cheap as possible.
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August 6, 2014 6:33:10 PM



Dude, thanks, i might consider this for my next build, but i just needed a psu to put in my current one.
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August 6, 2014 6:39:48 PM

do you have a dell link that actually shows this mini tower? They usually refer to case sizes such as SFF, USFF, etc. You probably will be fine with your current PSU as the TDP isn't that far apart from what you currently have..BUT if you can upgrade I'd like to be able to find the right size..as dell cases never play well with typical after market parts that aren't dell branded.
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August 6, 2014 6:58:53 PM

vagrancyx said:
do you have a dell link that actually shows this mini tower? They usually refer to case sizes such as SFF, USFF, etc. You probably will be fine with your current PSU as the TDP isn't that far apart from what you currently have..BUT if you can upgrade I'd like to be able to find the right size..as dell cases never play well with typical after market parts that aren't dell branded.


I talked to somebody at dell and they said that the EVGA 430w would fit in there. SO im gonna get that. Will let yall know how that works. And heres the mini tower- http://i.dell.com/sites/content/business/solutions/engi...

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August 7, 2014 4:34:42 AM

oh okay, yeah that is standard form factor then just smaller tower size. I figured by mini tower is was the SFF/USFF type of deal.
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