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PCI-E x16 25W limit, GPU needs max 30W - AMD R7 240 in dc7700 small factor, please help

Last response: in Graphics & Displays
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November 25, 2013 2:42:40 AM

Hello
I have HP dc7700 small factor computer
PSU model: DPS-240FB - 240W I found out it's Delta Inc product
V12 11.5A VCPU
V12 7.5A


E6600 processor [max 65W]
4 x 1 GB DDR2 RAM
1x HDD regular SATA
1x DVD-ROM
2x about 80mm FANs

I want to upgrade my GPU
I found interesting new card, perhaps it's not powerful, but not bad
it's AMD R7 240 - Max TDP 30W

So, probably PSU can handle it
but
on the producent site there is terrible information: http://h18000.www1.hp.com/products/quickspecs/12543_ca/...
PAGE 11

Power for PCI-E x16 is limited to 25W

and I have 3 questions:
1. is it only kinda recommendation not to exceed 25W due to weak PSU

2. if it's limited , so in which way ? by software [bios] hardware?
any possibility to gget additional 5W

3. what will happen if I put 30W GPU into 25W PCI-E x16 slot ?

any ideas what to do?
only 5W to be happy ;) 

Best solution

November 25, 2013 2:50:42 AM

I think you will be fine. The PCI-E standard states that a graphics card should be able to pull 75W of power off of the mobo interface safely. The 25W limit is for any other type of expansion card...

http://en.wikipedia.org/wiki/PCI_Express
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November 25, 2013 3:08:46 AM

Did you read the my source? PCI-E is an industry standard. It will supply 75W through the PCI-E port to a graphics card. The 25W limit is for any other type of expansion card.

It is written in the standard. I did read your source.
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November 25, 2013 3:13:58 AM

if you read my source..... so I don't understand the data in the doc..strange.

look carefuly SFF version of my comp can supply 25W for PCI-E x16
CMT - 75W

really I'm confused

I'm waiting for the answers of the users who had similar problem....I mean: producent tells there is only 25W in the slot, but in the fact you can get more...??
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November 25, 2013 3:20:33 AM

The document simply states the PCI-E STANDARD. The SAME STANDARD that says it should provide 75W to a GPU. What do you not get?

The GPU will be fine (provided the PSU can provide enough power, the MOBO will carry the power.)
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November 25, 2013 3:22:43 AM

As I wrote before I don't get .... why max power in SFF ver is 25W , but at the same time CMT 75W..in another words, If you are sure there is no limit, so why producent put this info [25W limit] ? joke ;)  ?
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November 25, 2013 3:27:25 AM

What I can understand it's only limit on paper ..only due to weak PSU - some kind of warning - not to exceed... but I'm not sure about that..so this is why I have doubt and try solve this problem on the forum
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November 25, 2013 3:35:09 AM

THE STANDARD STATES 25W FOR EXPANSION CARDS- EXCEPT GRAPHICS CARDS!!!!!!! THE HP DOCUMENT SAYS THE SAME THING!!!!! OMG IT IS MEETING THE STANDARD!!!!! HOW CONFUSING"!"!""!"!"!
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November 25, 2013 3:40:53 AM

Ok, thank You for information, However I don't see such exception statement in the document....Perhaps i'm blind :) 
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November 28, 2013 3:07:15 AM

Ok, I have installed this card Radeon R2 240 in pci-e x 16 slot

but GPU-Z shows that the GPU works only at 8x
Why ? What is the problem ?

perhaps it's only x16 size, but there is only power and speed spec like in pci-e 8x
25W max in HP doc still bother me

any advice ?
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November 28, 2013 11:11:21 PM

Oh, everything is OK..this card is PCI-E 8x not 16x ..16x was written everywhere, but when I looked very close to the spec, I have realised it's 8x...16x is only about the size of pci-e so it's PCI-e 16x @ 8x [if I can write in that way] Thank You for previous advice
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March 7, 2014 12:57:05 PM

xdon82 said:
Oh, everything is OK..this card is PCI-E 8x not 16x ..16x was written everywhere, but when I looked very close to the spec, I have realised it's 8x...16x is only about the size of pci-e so it's PCI-e 16x @ 8x [if I can write in that way] Thank You for previous advice


Hi xdon82, I got your same PC (dc7700 SFF) , can you tell me how is this R7 240?
Right now I've a Radeon HD 5450 which is very bad for gaming :( 
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March 22, 2014 9:30:49 AM

I have a XFX Radeon HD 6670 2GB DDR3 (63 Watts) on an HP 6005 SFF and works smoothly. Games with PES 2013 or 2033 METRO run well at a maximum resolution of 1366 x 768.
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March 23, 2014 12:59:45 PM

Jaalsuor said:
I have a XFX Radeon HD 6670 2GB DDR3 (63 Watts) on an HP 6005 SFF and works smoothly. Games with PES 2013 or 2033 METRO run well at a maximum resolution of 1366 x 768.


Very good to know, I think am gonna take a Radeon HD 7750 instead of this bad r7 240
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March 23, 2014 4:46:30 PM

Marco Giannetta said:
xdon82 said:
Oh, everything is OK..this card is PCI-E 8x not 16x ..16x was written everywhere, but when I looked very close to the spec, I have realised it's 8x...16x is only about the size of pci-e so it's PCI-e 16x @ 8x [if I can write in that way] Thank You for previous advice


Hi xdon82, I got your same PC (dc7700 SFF) , can you tell me how is this R7 240?
Right now I've a Radeon HD 5450 which is very bad for gaming :( 


Considering so weak PSU it works very good. Most games at ready HD or full HD resolution play with 75%-100% of full details at 25-30fps [and even more in many games]
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March 23, 2014 4:53:30 PM

Jaalsuor said:
I have a XFX Radeon HD 6670 2GB DDR3 (63 Watts) on an HP 6005 SFF and works smoothly. Games with PES 2013 or 2033 METRO run well at a maximum resolution of 1366 x 768.


on R7 240 PES 2013 run smoothly at higher resolution
By the way HD 6670 takes power twice than R7 240. In my case PSU is not overloaded at all
Have you checked your voltage at V12 line when load ?
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March 23, 2014 4:56:13 PM

Marco Giannetta said:
Jaalsuor said:
I have a XFX Radeon HD 6670 2GB DDR3 (63 Watts) on an HP 6005 SFF and works smoothly. Games with PES 2013 or 2033 METRO run well at a maximum resolution of 1366 x 768.


Very good to know, I think am gonna take a Radeon HD 7750 instead of this bad r7 240


You're gonna to go at total limits of your PSU - be careful
HD 7750 takes much more power than R7 240
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March 24, 2014 7:13:38 AM

xdon82 said:
Marco Giannetta said:
xdon82 said:
Oh, everything is OK..this card is PCI-E 8x not 16x ..16x was written everywhere, but when I looked very close to the spec, I have realised it's 8x...16x is only about the size of pci-e so it's PCI-e 16x @ 8x [if I can write in that way] Thank You for previous advice


Hi xdon82, I got your same PC (dc7700 SFF) , can you tell me how is this R7 240?
Right now I've a Radeon HD 5450 which is very bad for gaming :( 


Considering so weak PSU it works very good. Most games at ready HD or full HD resolution play with 75%-100% of full details at 25-30fps [and even more in many games]


xdon82 said:
Marco Giannetta said:
Jaalsuor said:
I have a XFX Radeon HD 6670 2GB DDR3 (63 Watts) on an HP 6005 SFF and works smoothly. Games with PES 2013 or 2033 METRO run well at a maximum resolution of 1366 x 768.


Very good to know, I think am gonna take a Radeon HD 7750 instead of this bad r7 240


You're gonna to go at total limits of your PSU - be careful
HD 7750 takes much more power than R7 240



In terms of wattage, I read some reviews which state max power consumption (full system consumption) with HD 7750 rated at about 140 W on full load.
HD 7750 has a max tdp of 50/55 W so I don't think it's so power demanding, but I know I should consider the amperage too
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March 24, 2014 7:25:15 AM

Go for a HD 7750. Its way faster and I think your PSU can handle it.
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!