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Sapphire 6850 Power Problem ?>

Last response: in Graphics & Displays
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June 7, 2012 12:27:34 PM

Hi,
Today I bought the Radeon 6850 1gb ddr5 model , and I have it installed into the pci x16 slot at the moment. I noticed once it was in the slot that I had no PCI power cable to go on top of the graphic card. So I got the adapter out of the graphic card box and connected it to the top of the graphic card. I noticed at the end of the adapter that it had a molex 3-pin connection and all I had coming out of my power supply was 4-pin molex connecters. I cant add pictures on this for some reason but I am wondering would that alright if I connected the 3 pin molex to the 4 pin ?
a c 235 U Graphics card
June 7, 2012 12:51:18 PM

yes your 3-pin male adapter connector will work fine with the PSU female connector

the real question is, what PSU are you using to power this card? it may be underpowered if it doesn't have a PCI-E power connector.
June 7, 2012 1:00:16 PM

I have an un-named 500w psu but I beleive the 6850 uses a maximum of 180 watts so should that be alright to run the card ?
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a c 235 U Graphics card
June 7, 2012 1:08:03 PM

it's an un-named PSU. if it was me i would use it as a paperweight

i know it won't deliver 500w and i doubt it will deliver 400w without a spark show. it probably has an underpowered 12v rail, (powers your cpu, hdd, gpu) that is extremely common on non-named units.

as is you won't break 300w gaming so I will only say this about your PSU, it's a roll of the dice of how long it will power your video card. a day, a week, a month, maybe longer but your card will run it into the ground. hopefully it does no damage to your PC when it goes.

you can always pick up the corsair cx430w or cx500w (solid budget units with plenty of power on the 12v rail).
June 7, 2012 1:21:10 PM

Wel I read the power supply on my pc and it says :

Dc output: +3.3v= 22a
+5v=25a
+12v=18a
+12v=16a
-12v=0.5a
+5VSB=2.5a

Is that not good enough for the 6850 ?
June 7, 2012 1:48:46 PM

My PSU name is ATX-500
a c 235 U Graphics card
June 8, 2012 12:31:19 AM

it's a roll of the dice. from your 12v rail it looks like a 450w PSU.
June 8, 2012 12:35:34 AM

2676731,7,329690 said:
it's a roll of the dice. from your 12v rail it looks like a 450w PSU.[/quotemsg

Other people have been telling me that it should be fine. What is the worst thing possible that could happen? PSU stop working ?
a c 198 U Graphics card
June 8, 2012 2:08:46 AM

barron14 said:
2676731,7,329690 said:
it's a roll of the dice. from your 12v rail it looks like a 450w PSU.[/quotemsg

Other people have been telling me that it should be fine. What is the worst thing possible that could happen? PSU stop working ?
said:

The worst possible thing that could happen is that the power supply could burst into sparks and die, and take some components, like your shiny new 6850, with it.

a c 235 U Graphics card
June 8, 2012 11:21:42 AM

Deemo13 said:
The worst possible thing that could happen is that the power supply could burst into sparks and die, and take some components, like your shiny new 6850, with it.


+1

more then likely it will just die a quick death but you (and we) don't know what safety circuits it has if any at all.
June 8, 2012 1:10:11 PM

ct1615 said:
+1

more then likely it will just die a quick death but you (and we) don't know what safety circuits it has if any at all.


so what is the recommended amps for the 6850 if i were to buy a new power supply and also what are the minimum amps required?
June 8, 2012 1:13:32 PM

it says exactly at the back of the PSU this:

Dc output:

[+3.3v= 22a ]
- Rated power= 130w max
[+5v=25a ]

[+12v1=18a ]
-- Rated power= 351w
[+12v2=16a ]

-12v=0.5a - Rated power= 6w

+5VSB=2.5a - Rated power= 12.5w

I would of thought 351w would be able to run the card with no problem?
a c 235 U Graphics card
June 8, 2012 2:19:33 PM

barron14 said:
it says exactly at the back of the PSU this:

Dc output:

[+3.3v= 22a ]
- Rated power= 130w max
[+5v=25a ]

[+12v1=18a ]
-- Rated power= 351w
[+12v2=16a ]

-12v=0.5a - Rated power= 6w

+5VSB=2.5a - Rated power= 12.5w

I would of thought 351w would be able to run the card with no problem?


here is the problem with PSU, their ratings are not certified by any independent organization. I can take a 500w non-name PSU and sell it has a 650w unit and no one can do anything about it. other companies that offer "quality" units may take that same 500w unit and say it doesn't offer 500w at 50c (only 30c) and its efficiency drops below 80% at 500w so we will sell it as a 430w unit even though we know it can provide 500w. Then you have build quality, some companies build their units with safety protection & quality components. Others, sip out on the safety protection and use cheaper components rated at lower temps so they fail in higher temps and don't last as long.

here is article for you to read on three different 550w PSU to help explain what i just stated above.
http://www.anandtech.com/show/3985/three-550w-psus-for-...

so in reality, you never know how good of a PSU you have without independent tests from sites like anandtech, techpowerup, jonnyguru, and hardwaresecrets. the ratings you posted above can be 100% accurate, 100% BS or somewhere in-between. Will your PSU run your AMD 6850? probably. Will it run it for long? probably not, the card will tax a non-name PSU. Will the PSU do any damage to your PC? I don't know. Maybe it just dies, maybe it smokes up, maybe it does do damage or maybe it lasts you over a year before it goes. Without knowing the actual name of the PSU I can't say and ATX-500 doesn't tell me much other then its scream cheap quality.


June 8, 2012 8:36:36 PM

Thanks for that info, so if I were to buy a new PSU what would be the minimum requirement of amps to run the 6850 would you say ?
a c 235 U Graphics card
June 8, 2012 8:41:46 PM

30a on the 12v will do the job on a quality unit.
June 8, 2012 8:50:52 PM

ct1615 said:
30a on the 12v will do the job on a quality unit.


Alright thanks, thanks a million for your advice, your a great help!
!