Hi @BMillikan73 ,

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Is there another power distribution board which supports two video cards? 

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Only one POWER_VGA1 socket available on power distribution board for T5610 no matter if it's M6NP2 or CVHT6, and no other options.

If you're planning to use 2 units of GTX 1070 originally from Nvidia which require one 8-pin power socket on each card, you may use a 8-pin male to dual 8-pin male cable, like this:

But if your GPU cards are retail version like MSI that require 8+6pin socket on each card, you may refer to this article which shows how to deal with dual 1080ti on a Dell T5600.

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Also, would this require an 825W power supply?

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Definitely yes, but also good enough. Take the article quoted above as example again, a 825w PSU can drive two 1080ti. It should be fine with dual 1070.

I am trying to find the right cable to install a Geforce 1660 Super into my sons T5610, can you share this info?

GPU - 8 PIN

PSU - 8 PIN

I cannot find an 8 pin to 8 pin PCIe cable for love nor money.

Hi @aenonymouse ,

Hard to find a single 8pin male-to-male cable from eBay or Amazon, but do in Aliexpress.

Besides, it's actually fine to use the splitter cable pictured above to connect a single GPU.