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4850 supplemental power/problems

Last response: in Graphics & Displays
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February 22, 2010 3:54:27 PM

I'm having some issues with my xfx hd 4850, which is more than likely directly because of how it's being powered. Due to not having a spare 6 pin, I'm using the (6pin to 2 4pin) adapter that came with the box. However, my BFG 550w psu, and how its supplemental power is distributed, only has the 4pins on a supplemental power circuit, which is the HDD hookup, a 4pin, and another 4pin on a single power line. I have each of these 4 pins in that series hooked up to the (6pin to 2 4pin) adapter. So to sum that up, I have a single supplemental power cord (all others are used) attached to 1. hard drive, 2. a 4pin from the 4850 adapter, 3. a 4pin from the 4850 adapter. Yell at me and tell me what I'm doing wrong here....I'm a bit tied with my PSU's adapter availability, but is this thing getting enough power (another thing is that I have no clue how to crossfire, are both these 4pins supposed to be used as I am using them, or will one suffice for power?).

My symptoms are pixellating and crashing my system, requiring removal of power to restart than having to mess with resolution. This happens during Heroes IV and google earth....so I'm thinking I'm not exactly taxing it.
I'm packing a i5-750 with 8gb 1333 ram. 550w psu.
February 22, 2010 4:18:49 PM

my wife's 360watt PSU has been running her i7-920 + 4850 just fine for over a year now.
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February 22, 2010 4:21:24 PM

Yeah, I know I have enough power, however, I don't know if it's hooked up right, therefore getting the power it requires.
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February 22, 2010 5:05:47 PM

My understanding is that the vid cards just pull 12v from the 4/6pin connectors. As long as your "supplemental" power rail can supply enough 12v amps for the card, it should be fine.

The 4850 is rated for around 150watts, so that's 12.5amps at 12v. The card will get a max of 75watts from the PCIe. So really, you only need a few amps on that rail to be fine. You'd have to look up your PSU specs. Best way would be to test a new PSU to see if the problems go away.
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Best solution

a c 173 U Graphics card
February 22, 2010 5:28:54 PM

Hmm that is odd, one thing I do when researching cards I look up the VRM spec or board power. Also looking up charts for power consumption (actual), also look into your bios for the volt readings but if you feel that you are not getting real results get a cheap volt meter.
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February 22, 2010 5:49:50 PM

So this 6pin to 2 4pin converter that came with the card...does this assume I will plug power into both?
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a c 173 U Graphics card
February 22, 2010 6:04:15 PM

beardcombover said:
So this 6pin to 2 4pin converter that came with the card...does this assume I will plug power into both?


? The card should only have one 6pin connector while the 4870 has two and if you have mistaken your card for a lower end one and has 2 then yes you must have both 6pin sockets in use for the card to work properly.
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February 22, 2010 6:13:58 PM

Sorry if I was unclear...I have one 6pin, you are correct, however I don't have a 6 pin free from my PSU. Inside the GPU box, there was a 6pin adapter to make it into 2 4pins. Each 4 pin is currently plugged into a male end from my psu on the same overall supplemental power cord. Thanks for all the support so far.
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a c 173 U Graphics card
February 22, 2010 7:19:30 PM

beardcombover said:
Sorry if I was unclear...I have one 6pin, you are correct, however I don't have a 6 pin free from my PSU. Inside the GPU box, there was a 6pin adapter to make it into 2 4pins. Each 4 pin is currently plugged into a male end from my psu on the same overall supplemental power cord. Thanks for all the support so far.



It should work unless you have something else in there that is loading the psu. If not then perhaps the psu is full of dust and failing. I once ran a 8800gtx of two such adapters off a 5 year old Enermax psu that wasn't even ATX 2.0 spec. (it was 1.7).
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February 22, 2010 7:28:50 PM

Unfortunately the psu is as new as the card. So basically it looks like this thing is powered and it may be a windows thing?? Anyone else with xfx 4850 occurrences similiar to this?
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a c 173 U Graphics card
February 22, 2010 10:35:29 PM

beardcombover said:
Unfortunately the psu is as new as the card. So basically it looks like this thing is powered and it may be a windows thing?? Anyone else with xfx 4850 occurrences similiar to this?



Is possible that you can test the card in another pc to rule it out as faulty?
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March 5, 2010 3:20:23 PM

Best answer selected by beardcombover.
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