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January 25th, 2025 17:03
Power issues ...
Hello,
I have just purchased a SmallRig 4752 240W power adapter mainly for my Dell Precision Mobile 7680 laptop.
I have just purchased a SmallRig 4752 240W power adapter mainly for my Dell Precision Mobile 7680 laptop.
The laptop has two methods for power intake: either via the 180W charger or via the 2x USB-C Thunderbolt ports. Both should be able to provide full power for maximal performance. When I connect the laptop to its docking station thorough the double USB ports, it seems to get full current from both ports and works with maximal performance.
However, when I connect it through two separate USB cables (both rated for above 100W) to a third-party external power source (the SmallRig 4752 240W power adapter), depending on the combination, either only one of the cables seems to provide the needed electricity, or both cables do provide some power but with a combined power way short of what SmallRig promises (two ports combined should be able to provide 140W + 100W simultaneously).
In either case. laptop's performance drops significantly. I have made sure to connect the cables correctly to the power adapter so that, together, they should be able to provide up to 240W (and there are no other devices connected to the power adapter).
What could be the problem?
However, when I connect it through two separate USB cables (both rated for above 100W) to a third-party external power source (the SmallRig 4752 240W power adapter), depending on the combination, either only one of the cables seems to provide the needed electricity, or both cables do provide some power but with a combined power way short of what SmallRig promises (two ports combined should be able to provide 140W + 100W simultaneously).
In either case. laptop's performance drops significantly. I have made sure to connect the cables correctly to the power adapter so that, together, they should be able to provide up to 240W (and there are no other devices connected to the power adapter).
What could be the problem?
Partow Izadi / Finland
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ejn63
10 Elder
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28.6K Posts
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January 25th, 2025 19:29
The maximum power that Thunderbolt 4 can deliver is 100W, and the system will take power through only one Thunderboolt port a a time.
If you want the system to run at full speed, only the OEM Dell 180W adapter will give you that.
PartowSky
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January 25th, 2025 21:04
Thank you for the reply. However, when hooked on my Dell docking station with two parallel USB-C cable (Dell proprietary, coming with the dock), it definitely takes power from both cables simultaneously (measured). Even with the third party power adapter, it takes juice from both cables (again, measured & metered), but not up to the ' 80-90W I need.
HedgeFundManager
2 Intern
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476 Posts
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January 26th, 2025 03:55
USB power delivery is still early in the design and development stage. It may take a few more years and updates to the standard to handle all manor of machine.
I use a Dell 130W USB which was cheaper than the 100W USB unit, go figure
PartowSky
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January 26th, 2025 09:10
Thanks for the comment. 👍🏼 Let's hope for the best. 🤞🏼