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micmic40
Posts: 4
Member Since: ‎10-23-2012
Message 1 of 11 (1,646 Views)
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hp dc5750 sff pc, 240w power supply vs modern graphics

hi,

I hope someone may help.

I have been looking for the most powerful graphics card that this computer can cope with.

I believe that the pcie 16x slots are able to provide max 75w.

 

The 240watt power supply has these voltage rails below:

+5.08v        ------17A

+3.33v        ------15A

+12.0v         ------7.5A

+12.0v cpu ------11.5A

-12.0v        -------0.15A

+5.08 aux -------3.0A

 

the card I am looking at is a hd 6670 1gb gddr5 low profile, the most important figure being TDP 66w

 

It looks like the voltages on the computer pcie bus is +12v and +3.3v, I guess from reading around, its the 12v line that is the major supplying voltage involved.

So the hd 6670 graphics card drawing max 66watts  needs 5.5 Amps  at 12volts absolute max, but apparently doesnt often use this much

I put an energy monitor on the pc and found under general operation the pc uses about 65w (playing a game etc)

The maximum I could get the pc to use was 107w, this was for a brief moment whilst spinning up the dvd and doing a stress test on graphics memory and cpu, this dropped to 89-91watts after that. ( it seems like the dvd spinning up adds 17watts)

So the question being, can anyone see a problem with the said graphics card on the said computer

thanks

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Paul_Tikkanen
Posts: 44,154
Member Since: ‎07-13-2010
Message 2 of 11 (1,639 Views)

Re: hp dc5750 sff pc, 240w power supply vs modern graphics

[ Edited ]

Hi:

 

I see two potential issues...

 

1. The form factor of the card you want to install is PCIe 2.1, and the slot in your PC is probably PCIe 1.1.

Installing a PCIe 2.1 card in a 1.1 slot may or may not work. Depends on the BIOS.

 

2. The PCIe slot on the SFF's is limited to 25W.  Only the CMT's/MT's have a 75W slot.

 

See page 9 of the document below.

 

http://h18000.www1.hp.com/products/quickspecs/archives_North_America/12546_na_v14/12546_na.PDF

 

I think you should be looking at a Radeon 6450 at the most, and hope the PCIe 2.1 thing isn't going to be an issue, but that is up to you.

 

I did test a Radeon HD 6570 in a dc7600 CMT with a PCIe 1.1 slot and it worked fine, so perhaps the 2.1 thing won't be an issue on the dc5750 either.

 

Paul

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micmic40
Posts: 4
Member Since: ‎10-23-2012
Message 3 of 11 (1,623 Views)

Re: hp dc5750 sff pc, 240w power supply vs modern graphics

I can see what you're saying and I am a bit disappointed about that, it crossed my mind to attempt an injection from a spare plug onto a graphics card (most probably wont!:smileyfrustrated:)

 

I had saw on this page:

http://h18000.www1.hp.com/products/quickspecs/12546_na/12546_na.html

 

that the    ATI Radeon HD 3650 (512MB DH) PCIe x16 Graphics Card    was including the sff dc5750 as complient with

 

graphics for tower and sff.jpg

 

and the 3650 tdp is about 77w

I am still hopeful that the mistake is that the pcie slot in the dc 5750 sff can only supply 25w.

 

On this page: http://www.tomshardware.co.uk/forum/337964-15-need-profile-card

someone recommended a 6570 (has a tdp of 60w) and 9-10 days after the recommendation, this answer was responded to as best answer!?!?

 

what is the most powerful card successfully installed in this machine?

I wonder if there is another pcie card of low power (60-80watts) that doesnt draw its power off the motherboard but instead can accept an external power plug?

 

I appreciate your speedy response Paul, I just dont want to accept the truth

 

 

Provost
Paul_Tikkanen
Posts: 44,154
Member Since: ‎07-13-2010
Message 4 of 11 (1,620 Views)

Re: hp dc5750 sff pc, 240w power supply vs modern graphics

You're very welcome.

 

I remember a post where I recommended the HD6450 to someone with a dc7800/dc7900 SFF (I forgot) (same 240W P/S), and he put in a low profile HD 6570, and posted that it works just fine.

 

I think that is putting a little strain on the P/S, but apparently the 25W PCIe slot thing is a non-issue with that card.

 

The 6570 does not require an additional connector.

 

I can't find the post or I would have pasted it below.

 

 

Honor Student
micmic40
Posts: 4
Member Since: ‎10-23-2012
Message 5 of 11 (1,607 Views)

Re: hp dc5750 sff pc, 240w power supply vs modern graphics

so do you think the reference material is wrong about the pcie slot can only supply 25w

(as the 6570 ddr3 model draws 44w and the 6570 gddr5 can draw 60w)

 

or do you think the reference material is wrong in stating that the motherboard can support the 70 odd watts of the 3650?

 

ps I just saw the hd7750 low profile takes 55watts of power!?

 

any more ideas please

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Paul_Tikkanen
Posts: 44,154
Member Since: ‎07-13-2010
Message 6 of 11 (1,603 Views)

Re: hp dc5750 sff pc, 240w power supply vs modern graphics

Hi:

 

It is hard for me to say since I like to test things first hand, and I steer clear of SFF business desktops.

 

I think the specs must be wrong, or there is a tolerance built into the slot wattage.

 

If a guy says he is running an HD 6570 in the slot and it is working, one of two things must be true.

 

1. He puts no load on it, and the thing isn't drawing 25 watts of power and he's been just plain lucky so far.

 

2. There is no issue with running that card in the PC under any load.

 

I know a 6450 would work in your model.

 

Check the specs on that. If it draws more than 25W, then the info on the specs is suspect.

 

The 6450 is the optional card offered on the 8200 Elite SFF with the 240W P/S.

 

Paul

Honor Student
micmic40
Posts: 4
Member Since: ‎10-23-2012
Message 7 of 11 (1,600 Views)

Re: hp dc5750 sff pc, 240w power supply vs modern graphics

well I know what you say is true.

 

without someone who is actually running some of these cards, we can only go on the information out there, which is slighly ambiguous.

 

I was given the pc so it wasnt a choice thing, but it is a solid design and I love recycling, it is doing well as a htpc, 4gb ram added in 2 dual channels, ideas of replacing the dvd for a bluray drive, and then the graphics we've been discussing.

 

I would love to throw £60-70-100 and not care on the outcome, but I'm not a gambling man

 

Its a nice quiet, solid pc with great recovery optionsand with a wireless keyboard and mouse is almost perfect. It would be perfect if the kids could play a few older games on it. I was just trying to eek the most from it for the last few years of its useful life.

 

If anyone has tried some of these cards mentioned above, or has more info to add, I would love to hear from you

 

thanks all

Honor Student
vanquishedangel
Posts: 2
Member Since: ‎08-01-2013
Message 8 of 11 (1,236 Views)

Re: hp dc5750 sff pc, 240w power supply vs modern graphics

I am curious about this as well because I am currently using the dc5750 to game still, it is a very solid computer. my specs are:

 

AMD 2.4 ghz dual core 4800+ (may upgrade if cheap to AMD 600+)

8gigs ram

Windows 7 ultimate 64bit on one hard drive/Ubuntu 13.04 64bit on another hard drive

Silicon image medley raid contoller serial ata/133 (swap space and ready boost only) (pci slot)

Fresco logic usb 3.0 card(pci slot)

Sapphire ATI Radeon HD 6450 (pcie x16 slot)

pcie x1 slot is open and may put intel turbo memory chip here

 

The cards I was thinking about are the ATI Radeon HD 7750, or nvidia gtx 650. I read somewhere that the 25 watts on the pcie x16 is only at bootup but after booting it can scale to 75 watts, but I have only seen this one place and not sure if it is true. I hope maybe you can shed some light on this.

 

This computer stills games for me on modern games, albeit a little slow due to the Radeon 6450, but it plays neverwinter online smoothly as long as the max physics objects is set to 0, with a low but very playable framereate of around 20 fps.

Honor Student
vanquishedangel
Posts: 2
Member Since: ‎08-01-2013
Message 9 of 11 (1,235 Views)

Re: hp dc5750 sff pc, 240w power supply vs modern graphics

I forgot to add that another pc I had, a dc7100, ran a 31 watt card just fine.

Distinguished Professor
RedRose0528
Posts: 3,429
Member Since: ‎03-28-2012
Message 10 of 11 (1,224 Views)

Re: hp dc5750 sff pc, 240w power supply vs modern graphics

Hello @vanquishedangel,

 

You might want to consider posting your issue on the commercial/ business forum because of the type of computer you have. There are experts there who work specifically with small form factor desktops that can help you. Here is the link to the forum where you can post, and you may have to create a new profile before posting.

 

Hope everything works out. 

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