Upgrade PSU for OEM PC

[julian_garritsen]

So I bought a new gtx 750 to upgrade my pc.And it require at least 350w psu but I only have 300w,so I decide to buy a Corsair Series VS 400W 80 Plus White.But before buying I have some question:Will it fit my pc case?Will my Dell motherboard support the new psu?Are there anything I have to worry about the old psu? I'm afraid the psu power pin will not fit the motherboard.
My system:
Dell Vostro 3900 Mini Tower Desktop
Intel Pentium G3260 3.3Ghz
2x 4GB DDR3 RAM
Asus GTX 750
Dell 0T1D10 H81 chipset

Please help me,this is my first time I upgrade my PSU.

 

[ArchitSahu]

You just need to switch out the PSU, and make sure all the connections are the same. Do not use the same wires from the old PSU with the new PSU, use the new PSU wires to connect to the components.

The PSU you choose is not that great, and honestly is not reliable. What is your budget? There are other options.

If you are seriously on a budget:
PCPartPicker part list: https://pcpartpicker.com/list/j8Q7JV
Price breakdown by merchant: https://pcpartpicker.com/list/j8Q7JV/by_merchant/

Power Supply: Corsair - CX (2017) 450W 80+ Bronze Certified ATX Power Supply ($44.89 @ OutletPC)
Total: $44.89
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2018-03-04 00:45 EST-0500

 

[terry4536]

I would also compare the measurements of the old PSU to the new one. Dell (and others) are notorious for using non standard size ATX components in there mini tower PCs.

In the past, they even used non-standard pin-outs on the PSU cable connectors.

 

[william p]

The Dell 300W PSU will run the GTX750 just fine. It runs drawing 65W from the 75W provided on the PCIe 16x slot.
https://www.hardwareinsights.com/dell-h305p-01-power-supply-review/
The card itself only needs 65W.

 

[terry4536]

Particularly if the system is a few years old, I would replace the power supply at the same time as installing the new graphics card.

Here is a good modular EVGA 450W PSU. $62
https://www.newegg.com/Product/Product.aspx?Item=9SIA2F85N39207

 

[julian_garritsen]

You just need to switch out the PSU, and make sure all the connections are the same. Do not use the same wires from the old PSU with the new PSU, use the new PSU wires to connect to the components.

The PSU you choose is not that great, and honestly is not reliable. What is your budget? There are other options.

If you are seriously on a budget:
PCPartPicker part list: https://pcpartpicker.com/list/j8Q7JV
Price breakdown by merchant: https://pcpartpicker.com/list/j8Q7JV/by_merchant/

Power Supply: Corsair - CX (2017) 450W 80+ Bronze Certified ATX Power Supply ($44.89 @ OutletPC)
Total: $44.89
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2018-03-04 00:45 EST-0500

What about the wires that conect to the power button in front of the pc,do I need to replace them.
And I'm thinking about buying the FSP Power Supply HYN Series HYN450ATX Active PFC .Does it support my motherboard and Intel Haswell?

 

[ArchitSahu]

You just need to switch out the PSU, and make sure all the connections are the same. Do not use the same wires from the old PSU with the new PSU, use the new PSU wires to connect to the components.

The PSU you choose is not that great, and honestly is not reliable. What is your budget? There are other options.

If you are seriously on a budget:
PCPartPicker part list: https://pcpartpicker.com/list/j8Q7JV
Price breakdown by merchant: https://pcpartpicker.com/list/j8Q7JV/by_merchant/

Power Supply: Corsair - CX (2017) 450W 80+ Bronze Certified ATX Power Supply ($44.89 @ OutletPC)
Total: $44.89
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2018-03-04 00:45 EST-0500

What about the wires that conect to the power button in front of the pc,do I need to replace them.
And I'm thinking about buying the FSP Power Supply HYN Series HYN450ATX Active PFC .Does it support my motherboard and Intel Haswell?

The Power switch wires connect to the motherboard, not the PSU.

That PSU is not good. Most results are Vietnamese, and looks like no certification. I would drop that PSU, just to be safe.

 

[william p]

Be sure and look at the 5V power of an aftermarket PSU. Dells use a lot there, and many aftermarket can come up short. EVGA is usually good about this.
Personally I would just run the Dell PSU and if you don't have any problems don't bother. The Dell PSU is a quality part.
Here is a comparison test of cheap PSUs.
http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story2&reid=71

 

[julian_garritsen]

You just need to switch out the PSU, and make sure all the connections are the same. Do not use the same wires from the old PSU with the new PSU, use the new PSU wires to connect to the components.

The PSU you choose is not that great, and honestly is not reliable. What is your budget? There are other options.

If you are seriously on a budget:
PCPartPicker part list: https://pcpartpicker.com/list/j8Q7JV
Price breakdown by merchant: https://pcpartpicker.com/list/j8Q7JV/by_merchant/


Power Supply: Corsair - CX (2017) 450W 80+ Bronze Certified ATX Power Supply ($44.89 @ OutletPC)
Total: $44.89
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2018-03-04 00:45 EST-0500

What about the wires that conect to the power button in front of the pc,do I need to replace them.
And I'm thinking about buying the FSP Power Supply HYN Series HYN450ATX Active PFC .Does it support my motherboard and Intel Haswell?

The Power switch wires connect to the motherboard, not the PSU.

That PSU is not good. Most results are Vietnamese, and looks like no certification. I would drop that PSU, just to be safe.

Can you recommend another cheap,reliable psu.That CX450 is not available on my country market.Is 450w PSU enough for future upgrade,or 500w? I'm afraid 500w can raise up my electricity bill.

 

[william p]

It doesn't draw 500W all the time, just what's being used at the moment. I would get a spare Dell 300W PSU just in case you need it. Cheap insurance. Low cost off brand PSUs can be a fire hazard. The Dell PSU is rated by UL (USA insurance standard) to be fail safe. The Dell 305W PSU in my Optiplex 380 is running a GTX1050Ti just fine. Any upgrade beyond that will require a bigger PSU. But that's a significant upgrade from a 750.