Charging a Mac Book via an eGPU, and Bootcamp Windows on a NVMe SSD in an external TB3 Enclosure
I need advice from experienced Mac Book (MB) users concerning charging with an attached eGPU.
Since several weeks I am preparing my new Mac Book Pro 16’ for a use in the most silent mode without external monitor.
So far I could achieve that the eGPU, a PowerColor Mini Pro 240FU, attached to the port on the upper left hand side, is running the internal MB screen in Bootcamp perfectly and iGPU & dGPU are not running. Consequently the fan of the MB is not audible. For Big Sur 11.2.3 it is a completely different story.
Due to my limited knowledge with MBs, charged via a TB3 port, I kept the genuine Apple power adapter on the upper right hand side port.
The Mini Pro 240FU provides a 240W power adapter, the build in Radeon RX 570 graphics card needs (usually) 150W.
The other TB3 port, on the left hand side, is used for an external 2TB SSD which is hosting on one partition Bootcamp Windows and on another data.
I noticed (or it seems), when the Mini Pro is attached, the power adapter is not in use, because the remaining 90W of the Mini Pro seems to be sufficient for a „low load use“. Additionally, I read elsewhere, that it makes no sense to have two charging devices attached to a MB because only one will be used anyway. However, there is a constant loss of battery capacity during gaming, which makes me believe, that the MB requires - even in this configuration, more than the 90W provided by the Mini Pro 240FU.
So finally my question: Does it makes sense to use the genuine Apple power adapter additionally to the charging power of the Mini Pro?
Although a completely different topic, I would like to ask another question which is keeping me "busy" since several weeks:
Could someone achieve to install (and run) Bootcamp Windows on a NVMe SSD inside an external TB3 exclosure, such as Yottamaster TB3-T3 Y-Sober series?
Finally I could not succeed and gave up.
I found the answer to one of my questions after a little research on apple.stackexchange.com:
It does not make sense. Because the Mac Book accepts only one charging adapter and will - if two are attached, select the one with the higher power output.
Despite the discussion on at what side you should charge your Mac Book (see the discussion on reddit.com) the MiniPro is attached to the left hand side and so far, I did not notice any heat or MB fan issues. If there is a decrease of the FPS on the left hand side I did not investigate.
@hans-st, I have a similar setup at work, 2019 13-in MacBook Pro + VisionTek eGFX Mini. Most of the time the 45W PD from the enclosure is sufficient for this laptop. On the rare scenario that I needed to use the Apple 61W charger, I connected it to the same side port as the eGPU enclosure. System Information > Power screen showed the correct charging wattage from the Apple charger.
You may want to try the same arrangement by connecting the Apple 96W charger to the left side. Keeping high throughput Thunderbolt devices on separate TBT buses is also beneficial so moving the NVMe TB3 drive to the right side is my recommendation.
@itsage, thank you for your suggestion.
Although I am satisfied with my current set-up I will try your recommendation.
Thank you again.
I tried the recommended power set-up and understood it is best for a high power consumption.
It's the same for me that the 45W of the MiniPro are sufficient for my basic PC routines. However, I was not aware that the PowerColor MiniPro 240F provides only 45W (due to the System Information > Power screen) and not the expected 90W.
Anyway, the PowerColor Mini Pro 240F seems to be the perfect substitute to my new Mac Book Pro, fulfilling a high level of mobility.