Asus Ati Radeon HD 5770 power issue?

[ivlatt]

Hi all,

I have a Asus Ati Radeon HD 5770 graphics card that worked a few times (very intermitently), although this was on a previous motherboard/power supply. I don't think this graphics card has ever worked with my current motherboard.

I upgraded my PSU to a 1000w modular power supply in hope it would resolve my issue, but it didn't, and as a result; this graphics card has sat collecting dust for a few months.

The problem I think I have is, I am not supplying the required power to the graphics card. The graphics card came with a 6 pin PCI-e to 2 x molex adapter (although 2 wires go into 1 pin at the PCI-e end, making it 5 pin). Although looking at the color code of the wires in the molex connectors, it doesn't seem standard. Each molex connector has 1 x brown wire, 1 x black wire and 1 x yellow wire. I can't seem to find any information on what power inputs the card requires (which doesn't help ).

I also had a cable come with my power supply which is supposed to power a 6 pin PCI-e graphics card, although this also has a cable layout of (3 black, 3 yellow, no brown).

My PSU has 2 different outputs that I can connect my 6 pin PCI-e cable to, HDD or PCI-e, I assume they output different voltages as when I connect my cable to the PCI-e output, the fans on the graphics card run constantly at full speed. When I connect the cable to the HDD output, the fans run at a controlled speed, although still no display.

Does anybody have any idea what's happening here? Do I have a faulty card? My money is on an incorrect power cable configuration but I'm not sure.

Any help would be much appreciated.

Regards,

Matt

 

[jsc]

Use the 6 pin PCIe power plug. Both it and the molex adapter are designed to furnish 12 volts to the card. The brown wire is irrelevant.

If you look, you will see that the yellow wires of the molex end up going to the 12 volt pins on the adapter. The color of the wires in the middle (brown) do not matter.

I just checked the adapters that came with my XFX 4870. The brown wires are ground wires.

 

[ivlatt]

So am I right in thinking my card is faulty? Like i say, if I use the cable that came with the PSU, connected to the "HDD" outlet; the fans run controlled, connected to the "PCI-e" outlet; the fans run uncontrolled (full speed).

 

[ivlatt]

Ok, after looking at it abit closer, the reason the fan runs on full whack when connected to the PSU "HDD" outlet is because it only outputs to 4 pins, not 6, and therefore the card is getting power from the PCI-e slot ((uncontrolled I assume?) it also runs full speed when there's no power connected to the card).
I've tried every method of connecting power to this card, with no success. I think my next option is to demand an RMA with Asus. Does anyone have any experience with this?

Regards,

Matt