Can you power an R7 250 with a Dell Optiplex 745, 275 Watt PSU?

AMDRazer · Jul 16, 2015

Hello, I have a Dell Optiplex 745 with a Intel Core 2 Quad Q6600 with a 160GB Western Digital Caviar Blue drive. Can I power an ASUS R7 250 1GB with the power supply?

Here are PSU Specs:

Dell H275P-01

+5V /18A, +3.3V /5A
+12V /17A
-12V /0.5A, +5VFP /4A

+5V and +3.3V must not exceed 106W

MAX output 275W

Thineswar · Jul 16, 2015

in short, no
you need about 27 A on the 12v rail, and you only have 17.
get a new psu or try a different gpu.

Archaic59 · Jul 16, 2015

Under load the R7 250 can pull about 150 watts average total system power. You'd be cutting it close but it may work.

Maarsch · Jul 16, 2015

Someone here can probably do the specific calculation for you if you also post additional info, such as RAM
or you can try it yourself here: http://www.extreme.outervision.com/PSUEngine
From what you've posted you'd barely make it. Although that's assuming you don't have a DVD_player, case fans and a single RAM stick.

But that card has a 450W recommendation. You may want to look at a 750 ti or GT730 instead.
http://www.tomshardware.co.uk/gaming-graphics-card-review,review-32899-2.html

AMDRazer · Jul 16, 2015

Maarsch :

no dvd,
the one hdd i mentioned
4 1gb sticks of ddr2 667 ram
1 very small case fan

Maarsch · Jul 17, 2015

With that you'd barely make it on pure Watt consideration.

BUT, here is why you should probably not do it. 275W is your PSU rating at room temperature. It will not be able to reach this at higher temperatures, it won't miss it by much but 10-15 Watt will be enough. And your PSU will get hot drawing that much power.
Note the may in Archaic's comment

And then there's Thineswar's comment. It's not always about the Wattage, but indeed what your 12V can pull off. I don't know which power goes over the 12V rail and what goes on different ones (maybe a power supply expert can chime in) so I can't calculated what Ampage it will have to provide. (65 (cpu)+35 (mobo) +150 (GPU)) /12 =20 > 17

Source of 150W http://www.tomshardware.com/reviews/radeon-r7-240-and-250,3717-9.html

Kisianik · Jul 18, 2015

AMDRazer :

I was not here for a while, but could not pass this post due to bunch of very educated answers. I was the same about 3 years ago, not anymore.

First take a look on this card ASUS R7250-1GD5 Radeon R7 250 1GB 128-Bit GDDR5 PCI Express 3.0
http://www.newegg.com/Product/Product.aspx?Item=9SIA24G28N5466

I can not see any supplemental power supply anywhere, so card is actually uses only 75 watt (provided by PCIE slot) or less. If in doubt, check newegg specification tab

"System Requirements
Power Consumption: up to 75Wno additional PCIe power required"

Case closed, your power supply is perfect for a job.

However there is one issue left, which was overlooked by all of you - will this card physically fit inside BTX case, oops.

Well , I went extra mile and checked Asus site http://www.asus.com/Graphics-Cards/R72501GD5/specifications/

It is 16 cm or 6.3 inches long, so it fit in Mini Tower for sure, I hope you have MT not DT, see below:

This is actual Optiplex 755 lineup, which is almost the same as 745, I took this part from previous posts, edit a bit, it is still applicable here.

So if you have Mini Tower

I think I have to step in since not so many users know the limitations of Optiplex Mini Tower cases - this is not your typical small ATX case, it is BTX case, and not all video cards can fit, so I will provide you all with small guide into Optiplex MT GPU upgrading.

THIS POST APPLICABLE TO MT (MINI TOWER) FORM FACTOR ONLY.

Unfortunately no card that is more than 7.5 inches long or 2 slots wide will PHYSICALLY FIT inside the case - it was found that only single bracket video card can fit due to BTX MOBO, where card internals facing upward towards PC internals, not ATX, where dual card design is blocking another PCI slot by facing downward.
If you prefer the card with beefier fan, then the length of the card must not exceed 7.5 inches, otherwise only "skinny" single bracket, single slot cards can physically fit.

Pictures below will prove my point.

View shows no room for dual bracket

Single bracket only, or you have to cut dual bracket in half

This is the other way to show my point

Here you can clearly see only single place for the bracket

Visual explanation

7.5 inches explained, also shown "obstacles"

This is the picture of actual "skinny" single slot video card (not sure which model)- perfect, "glove" fit.

So, you completely cleared, the only downside you will have that your card will be limited by PCIE limitations, your slot is at best 2.1, so you will loose some bandwidth.

Anything else I can help you with?

Thineswar · Jul 18, 2015

Kisianik :

AMDRazer :

I was not here for a while, but could not pass this post due to bunch of very educated answers. I was the same about 3 years ago, not anymore.

First take a look on this card ASUS R7250-1GD5 Radeon R7 250 1GB 128-Bit GDDR5 PCI Express 3.0
http://www.newegg.com/Product/Product.aspx?Item=9SIA24G28N5466

I can not see any supplemental power supply anywhere, so card is actually uses only 75 watt (provided by PCIE slot) or less. If in doubt, check newegg specification tab

"System Requirements
Power Consumption: up to 75Wno additional PCIe power required"

Case closed, your power supply is perfect for a job.
/quotemsg]

how are you sure on that?
the cpu takes almost 130w and the gpu 75w.
those and the rest of the components take about 130+75+100=305
dividing that by 12, you'd get about 25 A.
how is his psu sufficient?

Kisianik · Jul 18, 2015

Very persuasive opinions, oh well, I had to spend extra 5 minutes to finish my point once and for all, I wish that everyone can do the same to avoid those situations.

First, I did not say that this card needed 75 watt, it is actually uses only 65 watt http://www.hwcompare.com/17104/geforce-gtx-750-vs-radeon-r7-250/

Second, it comes from experience working with Dell PSUs of that age - they usually underrated by Dell by about 10% or so at least.

And to finish all arguments

Look what Dell has to say on their part list here http://accessories.euro.dell.com/sna/productdetail.aspx?c=uk&l=en&s=dhs&cs=ukdhs1&sku=490-bcel

The AMD Radeon R7 250 graphic card is AMD's fastest and most advanced 2D, 3D, and multimedia graphics performance for desktop PCs in the value market. It is a performance add-on graphics card targeted at selected Dell™ system.

Manufacturer Part : X5M2G
Dell Part : 490-BCEL

Compatibility
This product is compatible with the following systems:
OptiPlex 3020 MT
OptiPlex 3020 SFF
OptiPlex 7020 DT
OptiPlex 7020 MT
OptiPlex 7020 SFF
OptiPlex 9020 DT

Lets take a look at OptiPlex 3020 SFF specs here http://www0.sun.ac.za/itservices/Documents/datasheets/Dell-OptiPlex-3020-Spec-Sheet.pdf

PSU is only 255 watt any more doubts?

Apologies accepted.

Kisianik · Jul 18, 2015

Just to finish my bad guess - Optiplex 745 with 275 watt PSU is Small Form Factor https://www.dell.com/downloads/global/products/optix/en/opti_745techspecs.pdf so only low profile cards can fit.

So far in USA this is the only one priced fairly XFX Core Edition R7-250A-CLF4 Radeon R7 250 2GB 128-Bit DDR3 http://www.newegg.com/Product/Product.aspx?Item=N82E16814150713

Will this fit, to find out much more time is needed.

Edit: Judging by the pictures 95% fit guaranteed. I leave 5% for just in case.

AMDRazer · Jul 18, 2015

Hey everybody, I found a new PSU that came in a Dell Inspiron 531.

It is a Bestec.

http://www.amazon.com/Bestec-ATX0300D5WB-Rev-Power-Supply/dp/B0094342T4

That is the Amazon listing, will this PSU be more suitable?

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Can you power an R7 250 with a Dell Optiplex 745, 275 Watt PSU?

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