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

[xdon82]

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/12543_ca.pdf
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

 

[americanbrian]

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

 

[xdon82]

Unfortunetely producent has limited this to 25W for PCI-E x16 too

look at the documentation - table on page 11
http://h18000.www1.hp.com/products/quickspecs/12543_ca/12543_ca.pdf

there is awful limitation
but I don't know what kind of the limit it is

 

[americanbrian]

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.

 

[xdon82]

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...??

 

[americanbrian]

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.)

 

[xdon82]

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 ?

 

[xdon82]

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

 

[americanbrian]

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"!"!""!"!"!

 

[xdon82]

Ok, thank You for information, However I don't see such exception statement in the document....Perhaps i'm blind

 

[xdon82]

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 ?

 

[xdon82]

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

 

[Marco Giannetta]

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

 

[Jaalsuor]

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.

 

[Marco Giannetta]

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

 

[xdon82]

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]

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 ?

 

[xdon82]

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

 

[Marco Giannetta]

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]

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

 

[Khaleal]

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

 

[klz_1992]

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.)

sorry for bumping an old thread but is it the same for a dell system ? the thing u mentioned that it should provide 75 w to a GPU ?

 

[americanbrian]

Yes, it is a design standard for PC's. Please note that this does not mean the PSU has the oomph to provide the power. The motherboard SLOT can handle a 75W draw. If you have a very very low power PSU (150W? or so) then conceivably it may not provide the power needed, though this will depend on the other components in the system.

 

[klz_1992]

Yes, it is a design standard for PC's. Please note that this does not mean the PSU has the oomph to provide the power. The motherboard SLOT can handle a 75W draw. If you have a very very low power PSU (150W? or so) then conceivably it may not provide the power needed, though this will depend on the other components in the system.

i have a dell optiplex 755 SFF core 2 duo E6550 with a PSU of 275 so its ok for me to use a card between 50-65 watts even though the pcie x16 slot has 25w written on the mother board ?

this is my PSU http://imgur.com/tkZz8K6

and the pciex16 slot on the board http://imgur.com/0BUTnaw

 

[americanbrian]

I have run a 7770 on an optiplex with a 300w supply fine. I reckon you will be fine.

 

[klz_1992]

I have run a 7770 on an optiplex with a 300w supply fine. I reckon you will be fine.

thanks buddy cant waitttt to get my hands on a good low profile card and start my gaming adventure !