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2 Bronze

Do I need a PSU upgrade?

So heres the deal:

I have the xps 8700 and im planning in the future to upgrade the gpu to a gtx 970 and add a Samsung 850 evo 250gb ssd. The PSU currently in the xps 8700 is the stock 460 psu. I also have the OEM soundblaster sound card installed in the Xps 8700 as well as a secondary 500gb 7200 rpm hardrive from an old laptop. Keep in mind that the dvd drive will also be connected. 

so in the end heres whats happening:

xps 8700 will have: GTX 970, samsung 850 evo 250gb ssd, 7200rpm laptop hardrive, stock 7200 1tb hardrive, OEM sounblaster soundcard, and stock dvd drive. all connected to 460 watt stock psu.

Can it handle all this????

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15 Replies
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6 Indium

RE: Do I need a PSU upgrade?

It's a good idea to upgrade the power supply if a high-powered video card like the GTX 970 is to be used.

If you do elect to replace the power supply, please note that only power supplies of 5.9 inches or less in length will fit.

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2 Bronze

RE: Do I need a PSU upgrade?

Are you absolutely sure an upgraded psu would be necessary? I built a "test" pc with the same parts as my pc on pcpartpicker and it says its recommended that the psu must be at least 380 watts. Im trying to save money where I can so it would be in my best interest to not upgrade the PSU. Maybe a mini itx gtx 970 would be better since they use less power?

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6 Indium

RE: Do I need a PSU upgrade?

If your power supply has a six-pin connector, it may be adequate.

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4 Beryllium

RE: Do I need a PSU upgrade?

here is my .02 on the XPS 8700 power supply.

If you are going to spend $600 to $800 on the XPS 8700 desktop, and then spend another $400 to $500 adding an SSD and the graphics card, why trust it on a power supply that is marginal at best and compared to other units on the market is worth about $25 USD

You can get by without upgrading it, but my opinion is, it will fail or it might be intermittently unstable.

for $50 to $100 you can get an good to awesome PSU that will provide enough output.

PSUs are not something you want to load at 100% and run for a period of time.

So is it absolutely necessary? No. 

Is it recommended? Yes.

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8 Xenon

RE: Do I need a PSU upgrade?

380 watts is wrong.  The card will use 300W from the aux power connections and 75W from the PCI-E connector.  Do you really think that the entire rest of the computer will operate on 5W? Its wrong to think of a computer that only uses 12v on a single rail and all the other voltages are free.   You need 150 to 170W on the 3.3v/5v rails, then 15W - 25W on the +5VSB rail  which is 195W. And with only 80 percent efficiency you need 245W Input to get that 195W.  Typically you need 48 Amps OR MORE on the 12v rails Which is 576W. At 80 percent Efficency that means 720W X .8 =576W

This is why I recommend a Corsair CS750M is a Minimum. For SLI 2 cards like this I do not recommend anything less than an RM1000  power supply.

http://www.newegg.com/Product/Product.aspx?Item=N82E16817139057

 

 ATX is Wrong and inadequate.  You must use EPS12v 2.91+ certified power supply.

http://www.newegg.com/Product/Product.aspx?Item=N82E16817139061

 

 


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2 Bronze

RE: Do I need a PSU upgrade?

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4 Beryllium

RE: Do I need a PSU upgrade?

Amazon.com: EVGA SuperNOVA 750G1 750W ATX12V Power Supply 120-G1-0750-XR: Computers & Accessories

Would this PSU fit?

Yes, but I disagree with the opinion that 750W is needed.  I'd go with the 650W. This one is both ATX12V v2 and EPS 2.91 certified and less money.

http://www.newegg.com/Product/Product.aspx?Item=N82E16817438026

these EVGA's are manufactured by FSP, a solid manufacturer.

Personally I prefer Seasonic brand.  but it is slightly more money. 

http://www.newegg.com/Product/Product.aspx?Item=N82E16817151088 

I now run three of these PSUs, two in XPS 8700s, one running a graphics cards that draws more power than a GTX 970 with zero issues.

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6 Indium

RE: Do I need a PSU upgrade?

This is why I recommend a Corsair CS750M is a Minimum. For SLI 2 cards like this I do not recommend anything less than an RM1000  power supply.

They're saying 550 watts; I didn't realize that the card itself drew 550 watts!

With that kind of power consumption, I recommend moving the innards to a gaming chassis with better cooling.

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4 Beryllium

RE: Do I need a PSU upgrade?

They're saying 550 watts; I didn't realize that the card itself drew 550 watts!

Who is saying 550 watts?  The GTX 970 doesn't draw 550 watts. max power is 213 watts during these tests with average power consumption at 168W, details how and what is behind these numbers are at this link.

http://www.techpowerup.com/reviews/MSI/GTX_970_Gaming/

GTX 970 Power consumption is less than a GTX 770.

MSI says this card needs a minimum 500 watt PSU, and that's for the entire system so a high quality PSU like the seasonic or the EVGA is more than enough.

http://us.msi.com/product/vga/GTX-970-GAMING-4G.html#hero-specification

Cooling is fine. We have a GTX 770 overclocked in one of our XPS 8700s and temps are decent.  I moved the HDD up to location 2 and removed the HDD cage for better front air flow but extended gaming does not heat it up.

Several examples in this thread. .

http://en.community.dell.com/support-forums/desktop/f/3515/t/19611037

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