what's the different between the one with the external power adapter and the one without?

With my USB 3 Ports on my Acer TC-780 front panel ports, I can power all four ports with thumb drives. When I tried the same with a Dell U473D Slim Multimedia Keyboard with 2 USB Port I had to use the pawer supply that came with the HB-UMP3 4-port Powered USB hub. I would advise getting the powered hub because you don't know if your USB port will support enough devices without the power supply unit.

How many ports can I have active at one time, without overloading the single port of the computer?

actually, while you can theoretically link 127 devices, there is a limitation to the depth or hiearchy you can link hubs (which is 7). In many systems (particularly windows) you may find that the hub controller in the pc can consumer 2 or 3 of those tiers. While that's likely not an issue for most, I've run into a problem when I link a 7 port hub into a KVM switch -- I get an error message stating that the system can not see some devices (because the actual 7 port hub actually contains 2 usb controllers and the kvm switch contains 2 controllers). Suffice it to say -- this is a rare occurrence -- just don't daisy chain a bunch of 4 port hubs together if you run out of ports -- get a hub with more ports

How long is USB3 cable?

measured mine at about 1 meter. I really like this thing. The two red high-power only ports are oriented 180 degrees from the USB 3.0 ports so you physically can't mix them up either.

Will using a 7 usb 3.0 hub ultimately put next to no strain on my motherboard because power is being generated from the AC adapter?

I 5 Gigabyte Motherboard with powerful Intel processor, 16 Ram has moor paver than standard PC. I don't think the hub would help. However, some software might. I will look this up in the later date.

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SABRENT Powered USB Hub, 4 Port USB 3.2x1 5Gbps, USB 3 Splitter, On/Off Switch LED Indicators, 68cm (2ft) Cable for PC, Laptop, iMac, MacBook (HB-UMP3)

SABRENT Powered USB Hub, 4 Port USB 3.2x1 5Gbps, USB 3 Splitter, On/Off Switch LED Indicators, 68cm (2ft) Cable for PC, Laptop, iMac, MacBook (HB-UMP3)

Product ID: 113197724

Details

Brand
SABRENT
Colour
Black
Hardware interface
USB 3.0
Special feature
Fast Charging

⚡5Gbps SuperSpeed USB 3.2

💡LED Power Status Indicators

🔌4 Individually Switchable Ports

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€ 28.34

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Sold byAmazon IrelandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔗 Connect Smarter, Work Faster — Own Your Desk Setup!

POWER YOU CAN TRUST - Powered hub with a robust 60W adapter ensures stable, consistent power for all connected devices.
BLAZING FAST TRANSFERS - Experience data speeds up to 5Gbps—10x faster than USB 2.0 for instant file moves.
PLUG PLAY SIMPLICITY - No drivers needed—just connect and go, compatible with Mac, PC, laptops, and more.
SLEEK DURABLE PORTABLE - Compact ABS design with non-slip base fits perfectly on any desk and travels effortlessly.
TOTAL CONTROL AT YOUR FINGERTIPS - Independently toggle each USB port with dedicated on/off switches—no more unplugging chaos.

The SABRENT Powered USB Hub HB-UMP3 is a compact, durable 4-port USB 3.2 hub delivering blazing 5Gbps data transfer speeds. Each port features an independent on/off switch with LED indicators for precise control and power status. Equipped with a powerful 60W adapter, it guarantees stable power delivery to multiple devices simultaneously. Compatible across Mac and PC platforms, this plug-and-play hub is designed for professionals seeking efficient, clutter-free connectivity with a sleek, portable form factor.

Specifications

ASIN	B00TPMEOYM
Best Sellers Rank	1,087 in Computers & Accessories ( See Top 100 in Computers & Accessories ) 15 in USB Hubs
Brand	SABRENT
Brand Name	SABRENT
Colour	Black
Compatible Devices	Card Readers, Desktops, Digital Cameras, Headphones, Keyboards, Laptops, Monitors, Mouse, Printers, Scanners, Smartphones, Tablets, USB Flash Drives
Compatible devices	Card Readers, Desktops, Digital Cameras, Headphones, Keyboards, Laptops, Monitors, Mouse, Printers, Scanners, Smartphones, Tablets, USB Flash Drives Compatible devices Card Readers, Desktops, Digital Cameras, Headphones, Keyboards, Laptops, Monitors, Mouse, Printers, Scanners, Smartphones, Tablets, USB Flash Drives See more
Country of Origin	China
Customer Reviews	4.5 out of 5 stars 25,113 Reviews
Data Transfer Rate	5 Gigabytes Per Second
Enclosure Material	Acrylonitrile Butadiene Styrene (ABS)
Global Trade Identification Number	00819921011749
Hardware Interface	USB 3.0
Hardware interface	USB 3.0
Item Dimensions L x W x H	8.7L x 3.8W x 1.5H centimetres
Item Weight	1.5 Ounces
Manufacturer	SABRENT
Manufacturer Part Number	HB-UMP3
Model Number	HB-UMP3
Number of Ports	4
Operating System	Mac OS X and Higher
Product Features	Fast Charging, Fast Data Transfer, Indicator Light, Lightweight, Plug and Play
Product Warranty	2 years after registration
Special feature	Fast Charging, Fast Data Transfer, Indicator Light, Lightweight, Plug and Play
Total USB Ports	4
Total USB ports	4
UPC	819921011749
Unit Count	1.0 count

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