Dual gpu Nvidia M6000 on Precision T3600

rough calculation 2x250=500W, 635-500=135W, CPU:130W, ++ other components,
generally there always should be spare capacity to handle reasonable peaks
and there's clearly not enough Wattage (without even going into each rail details).
I wouldn't risk frying equipment, especially considering what's outlined in specification regarding video card: maximum of 300 W !

Thanks very much. Infact it was also my fear. At this point I would opt for a cheaper solution: 2 GTX 1080 of 180W and each or the same Quadro P5000 GPUs with the same performance and consumption.

Thanks for your reply but I correct you by saying that the housing on the T3600 / 3610 for the proprietary power supply is not suitable for the 825W and 1300W models, suitable instead on the T7600 / 7610/7810. These in fact use 685/825 / 1300W power supplies
I have all these feeders and I have tried to my own expense: The channel on which the tooth slides is slightly more displaced and does not allow the larger feeders to enter.
The T3600 / 3610 is only compatible with 425w and 635w power supplies

However, I solved with two 180w GTX 1080s each and I should be within the parameters

I needed more speed in the CUDA calculation

I remember when the M6000 was the latest and greatest GPUs and people were making fun of those who were smart enough to spend the money on one, let alone two. This little project sounds fun, you have my full support. 

That said, you know you can upgrade your PSU up to 1300 watts. The T3600/T5600/T7600 and the newer T3610/T5610/T7610 all have interchangeable PSUs. I had a 825W PSU in my T3610 a long time ago.

1300W - PN: H3HY3
825W - PN: H825EF

I wish Dell would build their Precision series workstations the way they use to.

Thank you very much, I already knew about the cables to change and in fact I have everything I need. Double copy of the 6pin and 8pin cables for the most performing Quadro and RTX, I also have specific adapters and extensions.

When upgrading to a higher PSU and needing more PCIE power, you will need to also upgrade the pcb that the PSU connects to and buy a couple of 10pin to 8 pin pcie cables. Part numbers below. Do a quick search on Ebay and you will see what I am talking about.

T5600-7800 PSU Board - PN: M6NP2
10pin to 8pin PCIE cables (search dell 10 pin to 8 pin pcie, there are plenty of them out there but there is a link) - https://www.ebay.com/itm/142936385889

The 10pin connects to the extra CPU port on the PSU board.

Hope that helps.