VRTX no additional PCIe power

Hi,

here’s what you could do in your situation:

In CMC, positively identify which physical slots are the 150 W full height slots and move the riser with RTX A4000/GRID K2 into one of those.
Ensure that slot is assigned to one of the M630s and that blade is powered on; clear any power caps.
Verify the backplane/cage part number against the latest VRTX technical guide to confirm it’s the GPU capable revision that supports 150 W/225 W per slot.

Double check the 0X5DNV/0215XG cables are in the designated GPU power headers on the cage, then reseat riser and cables.In Power Monitoring, ensure there is enough available budget and no PSU in a fault state; try temporarily reducing redundancy to see if the chassis then allows the slot to power on 

If after those steps the riser LEDs remain off and the slot still logs “unable to power on device,” there are really only two likely root causes:The PCIe cage/backplane is an older or non GPU variant that does not actually route auxiliary power, so the cables are effectively cosmetic.There is a hardware fault in the cage or the power distribution path to that slot.In that case, the realistic options are:

Replace the PCIe cage with a GPU capable revision and verify via part numbers.Stay with ≤75 W GPUs that don’t need auxiliary power (like your R5 220) and accept the performance ceiling.If you can share the exact PCIe cage part number and the slot number you’re using, I can help you map it against the documented 150 W slots and confirm whether the hardware should be able to feed those GPUs

@Dell-Martin S​ thank you for your advice. I can confirm I have turned power budgeting off and switched off dynamic power supply activation. I am testing with only 1 M630 powered on in the chassis so there should not be power cap issues (none of my 1100W power supplies show any error)

The part number for my PCIe riser is 0GTNRT.

I got my hands on an old Grid K2 card and can get it recognised if I put it in SLOT 1. However when I assign it to a blade and turn it on the Blade reports an NMI error and will not boot.

I have tried my A4000 in SLOTs 1 & 2 and when I do the PCI ID shows as 0000:0000] and required adaptor power shows as 0W but when I assign the slot to a blade and turn on the server I get the error that it can not start the card.

If I put the Grid in SLOT 2 the it is identified as aA PCIe adapter PLX Technology, Inc. PEX 8747 48-Lane, 5-Port PCI Express Gen 3 (8.0 GT/s) Switch [0000:0000] is inserted in PCIE Slot 2 but correctly identified as a Grid K2 in slot 1.

Appreciate your advice so far and any further advice you can offer.

with thanks

Hello, Gonesolo1.
I truly appreciate that Martin is doing his best to assist, and I also want to help as much as possible. However, I do need to let you know that this setup is not officially supported. While it may seem like a power‑related issue—especially since other cards appear to work—we’re unable to provide support for any problems that arise from configurations outside official support guidelines.

I’m really sorry that I can’t offer a clearer solution this time. If you happen to find any documentation that confirms compatibility, please feel free to share it with me. I’d be happy to take another look.

Respectfully,

Hi,

I do appreciate all the advice from everyone. The reason I sourced a nvidia k2 was for testing as, according to the VRTX technical guide, this is a compatible card.

however I am unable to even get this supported card working.