NVIDIA 9800 GX2 8-pin power connector requirements?

I'm having some difficulty getting my NVIDIA 9800 GX2 up and running. The primary symptom is a red light behind the 8-pin power connector.

I have a 1kW PSU with 6-pin PCI-E connectors. The mobo is a NVIDIA 680i. There's a 8800 GTX in the system, too.

My questions are:
Should the 9800 GX2 show up in device manager, etc. without power to the 8-pin power connected?

Should plugging a 6-pin plug into the 8-pin jack work (if not recommended)? It fits, and I'd be surprised to learn that the four 12V pins aren't just tied together on the card.

Does it make sense that it still doesn't light up green when I provide 12V to the remaining 2 pins (via a slightly modified molex adapter)?
Maybe they're on different "bars"? I checked all pin levels with a multi meter and they're all steady at 12-12.1V...

I'm picking up a 6-pin to 8-pin adapter, but will be a few days in shipping, and at this point, I'm a bit concerned it won't help.

4 answers Last reply
More about nvidia 9800 power connector requirements
  1. What make and model is the PSU?
  2. The 6pin to 8 pin adaptor should do the trick
  3. I finally found this post:

    It made clear what the pinout was. It's wrong most other places. There are 5 ground pins, 3 12V pins.

    I agree that a 6pin SHOULD work, but it doesn't. I ended up buying a 6 to 8 pin adapter that is working fine.
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