Location of PCIe 6-pin connector in HP Z640 workstation?

[harleygnuya]

I have a Z640 workstation that I bought new with a NVIDIA Quadro P600 video card.  I need a video card with more memory (minimum 4GB) and am looking to upgrade to a NVIDIA Quadro P4000 video card.  I have checked, and this card was offered as an option when I bought the Z640, so I know it is compatible.

My question centers around the PCIe 6-pin auxiliary connector that the P4000 requires.  Where in the Z640 does this connector plug into?

[erico]

You will need to check to see which unused  connector(s) are available at the 925W PSU. 

Compatible components

https://www.userbenchmark.com/System/HP-Z640-Workstation/12688

[harleygnuya]

Thanks.  That's my problem, because I don't see any available connectors from the power supply.  The image shows the four connectors I found, G3, M1, P2 and R2.  P2 connects to the motherboard, the others pass back behind the chassis and I have not found any 6- or 8-pin PCIe power connectors on any cables coming back out from behind the chassis.  None of the ones I've been able to find look like a PCIe power connector.

Before I start tearing things apart to see what's behind the chassis, would you have any other suggestions of where else I might look to find the connector?

Does anyone have a Z640 that has a video card using an auxiliary PCIe power connector?  If so, could you check your workstation to see where that power connector connects to the Z640?

[erico]

Can yo take that photo again and this time show the complete open side?

That helps with perspective in a big way.

Can you take a photo of the other side as well?

Make that one show the full side as well.

[harleygnuya · Accepted solution]

I found them!   There are two PCIe 6-pin power cables that can be plugged into video cards.  Refer to this picture:

The yellow ellipse encircles connector G3 from the power supply.  The cable connected to it passes through the chassis and runs down behind it to the bottom-most opening, through which it emerges into the open area.  From there, it splits into two cables that plug into dummy receptacles on the lower case fan housing.  I believe this is done merely to keep the cables neat and out of the way.  The orange ellipse encircles the connectors G1 and G2 as they are plugged into the fan housing.

To use a video card that requires auxiliary PCIe power, unplug a cable (G1 or G2) from the fan housing and plug it into the card.  The second cable provides power for a second video card.

[erico]

I did not push for a different PSU because I knew they had to be there.

Otherwise that would have been mentioned by others who have upgraded their video card.