Question HiveOS mining - RTX 3060 PCIe 1x Riser Power Requirements

Oct 6, 2021
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Hi.
I’m quite new to mining. After one week of o/c and research, I’m stuck to one question.

My setup is 6x3060 lhr v2 and they are limited in HiveOS (Linux) to 120w each (real-time, the max one card goes is up to 105W). My PSU is an EVGA SuperNOVA G+ 1600W…
I’m planning in time to add 6 more GPUs (same).

Now, my question: since the 8pin cable which is plugged directly into the GPU delivers 150W, do I really need to power up the PCIe riser?
As far as I understand, the PCIe 1x riser only uses USB for data transmission and the 6pin port is to deliver 75W to the GPU, but for the calculations above, it would not be needed?
I’m asking as the PSU has 9 connections for GPU and I’m not sure if adding a cable splitter will work with an additional 6 GPUs.
At the wall, the maximum wattage is up to 640W for the entire rig, so in theory, 1600W PSU will be enough for another 6 GPUs.
 

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