On Fri, Dec 6, 2019 at 7:50 AM D. Hugh Redelmeier via talk <talk@gtalug.org> wrote:
| From: o1bigtenor via talk <talk@gtalug.org>
| Can find pin outs - - - - none of the cable pics are clear enough to count | the number of individual runs.
<https://allpinouts.org/pinouts/connectors/power_supply/pci-express-pcie-6pin-power/> <https://allpinouts.org/pinouts/connectors/power_supply/pci-express-pcie-8pin-power/>
Or better (but look way down, from "6 Pin PCI Express (PCIe) Power Cable Connector" on):
<https://www.moddiy.com/pages/Power-Supply-Connectors-and-Pinouts.html>
The original 6 pins are all assigned 12v or ground. The extra pins in the 8 pin connector are just grounds. All seem to be connected.
The top row is the issue. The top row are all labelled as ground (IIRC the bottom row are all 12 V. AIUI that is the newer style of connector. In the past there was not uncommonly used a cable w an 8 pin on one end and a 6 + 2 on the other. The 8 pin then on the left hand side had both top and bottom pins labelled as ground so it makes sense that one ground line was omitted - - - - especially as the predominant graphics boards at the time used 2 - 6 pin connectors. https://www.moddiy.com/pages/Power-Supply-Connectors-and-Pinouts.html
Why two more grounds? Because the 8-pin is supposted to supply more power and "they" added pins to make this new requirement unmistakable. Or maybe they just actually needed two more grounds.
You said one pin on your connector was absent. => your connector isn't right
I don't know if this matters for your new card. Clearly it does not matter for your old cards. Is the pin missing for each of the connectors used for the old video card?
First point - - - - see earlier url. Second question - - - yes. Regards