howtopowerup
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- Jan 6, 2022
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I managed to score a 3070 Ti for a decent price and have spent the last few hours trying to figure out if I will be able to run it in my T7810.
The first problem, that I did not realize until after I had already bought it, is that this particular custom variant (Zotac GeForce RTX 3070 Ti AMP Extreme Holo)
is extremely power-hungry and requires 2x 8 pin plus 1x 6 pin PCIe power inputs.
My T7810 has
the 825W PSU and
a PCIe power cable that connects 8 pins on the power distribution board to two 6 pin PCIe cables (0D92C9)
Assuming this connects to a single rail of the PSU, the maximum power I can draw should be 12V*18A=216W, which is not enough for two 8 pin PCIe connectors (max. 2*150W=300W) but should probably be fine for one 8 pin and one 6 pin connector (max. 150W+75W=225W). Since I am only using NVMe drives I have 3 free 15 pin SATA power connectors that should sit on different rails on the PSU. My idea is to combine all of them to supply the second 8 pin connector of the GPU, as was done in this video:
So that leaves me with finding the best way to connect the 8 pins on the power distribution board to 8 plus 6 pins on the graphics card.
I found several cases where people experienced sudden outages when simply using a 6 pin to 8 pin adapter to connect one of the 6 pin cables to the 8 pin slot on their GPU (not sure why exactly).
But there is a Reddit thread with a slightly odd solution that was allegedly implemented by a Dell technician:
https://www.reddit.com/r/nvidia/comments/6ieqpu
1) Plug one of the 6 pin connectors on the 8 pin out on the power distribution board
2) Connect the 8 pin connector to the GPU
3) Connect the other 6 pin connector to the GPU
I don't fully understand why this works and how it solves the issue, but it is at least corroborated by one other user.
Has anyone here done what I am planning to do or at least a part of it? Does it sound sane or am I about to fry my system and burn the house down?
Thanks for any pointers.
The first problem, that I did not realize until after I had already bought it, is that this particular custom variant (Zotac GeForce RTX 3070 Ti AMP Extreme Holo)
is extremely power-hungry and requires 2x 8 pin plus 1x 6 pin PCIe power inputs.
![](https://www.techpowerup.com/review/zotac-geforce-rtx-3070-ti-amp-extreme/images/power.jpg)
My T7810 has
the 825W PSU and
a PCIe power cable that connects 8 pins on the power distribution board to two 6 pin PCIe cables (0D92C9)
![](/forums/proxy.php?image=https%3A%2F%2Fdstockmicro.com%2F17291-large_default%2Fcable-d-alimentation-gpu-0d92c9---0d92c9-pour-dell-precision-t5810precision-t3600precision-t3610precision-t5600.jpg&hash=266d252eee4c0f3dbb495de7f9b4f1c4)
Assuming this connects to a single rail of the PSU, the maximum power I can draw should be 12V*18A=216W, which is not enough for two 8 pin PCIe connectors (max. 2*150W=300W) but should probably be fine for one 8 pin and one 6 pin connector (max. 150W+75W=225W). Since I am only using NVMe drives I have 3 free 15 pin SATA power connectors that should sit on different rails on the PSU. My idea is to combine all of them to supply the second 8 pin connector of the GPU, as was done in this video:
So that leaves me with finding the best way to connect the 8 pins on the power distribution board to 8 plus 6 pins on the graphics card.
I found several cases where people experienced sudden outages when simply using a 6 pin to 8 pin adapter to connect one of the 6 pin cables to the 8 pin slot on their GPU (not sure why exactly).
But there is a Reddit thread with a slightly odd solution that was allegedly implemented by a Dell technician:
https://www.reddit.com/r/nvidia/comments/6ieqpu
1) Plug one of the 6 pin connectors on the 8 pin out on the power distribution board
2) Connect the 8 pin connector to the GPU
3) Connect the other 6 pin connector to the GPU
I don't fully understand why this works and how it solves the issue, but it is at least corroborated by one other user.
Has anyone here done what I am planning to do or at least a part of it? Does it sound sane or am I about to fry my system and burn the house down?
Thanks for any pointers.