Dell Optiplex 745 Mini Tower PSU Upgrade

Rekt_Son · Oct 20, 2014

So I'm going to change my CPU from Core 2 Duo E4600 to Core 2 Quad Q6600, and my current VGA is Zotac GTX 750, I'm afraid my PSU can't handle after I changed to Q6600
So I want to change the PSU and i found this PSU : Zalman LE-400 400W
Will it fit my case ?

nick779 · Oct 20, 2014

Rekt_Son :

Dell mini tower PSUs are proprietary along with the motherboard connections. So basically you would need a new case and motherboard to do the upgrade.

The 745 im looking at looks like this.

http://naudotikompiuteriai. com/papildiniai/katalogas_panel/images/dell_745mt[263].jpg

carver_g · Oct 20, 2014

Dell hasn't used proprietary PSU's in the Optiplex in over 10 years. Most any standard size PSU will fit, including the Zalman. The only problem is mounting, as the 745 has a BTX case. I've seen people successfully get one to fit by mounting it upside down in the case.

Rekt_Son · Oct 20, 2014

nick779 :

Rekt_Son :

Dell mini tower PSUs are proprietary along with the motherboard connections. So basically you would need a new case and motherboard to do the upgrade.

The 745 im looking at looks like this.

http://naudotikompiuteriai. com/papildiniai/katalogas_panel/images/dell_745mt[263].jpg

My PC look like this : http://cdn.overclock. net/e/e0/e00dffc5_OPTIPLEX_GX520-MT-sm.jpeg

Ubrales · Oct 20, 2014

Yes it will fit and it will work. You will have to manually bend a retaining tab inside the case and you will be able to use only three of the mounting screws. This is ok.

Dell utilizes a tab as part of their PSU fastening system and this will interfere with your new non-Dell replacement PSU. Just bend this tab out of the way. This is how I did it.

Rekt_Son · Oct 20, 2014

Thank you guys, I will choose this PSU

nick779 · Oct 20, 2014

I was thinking you meant a small form factor case.

I dont know what to tell you carver, the 745, 780, 3010 and 3020 all have nonstandard connections in my units.

Ubrales · Oct 20, 2014

For info - I replaced the PSU (no problems) in my Dell Optiplex 745 SMT with an Antec 400 watts PSU. I wanted 400 watts instead of Dell's 305 watts PSU.

carver_g · Oct 20, 2014

nick779 :

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