Question 1

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

Accepted Answer

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.

Question 2

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

Accepted Answer

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

Question 3

How long is USB3 cable?

Accepted Answer

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.

Question 4

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?

Accepted Answer

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.

ASIN	B00TPMEOYM
Additional Features	Individual Power Switches for each USB Port
Best Sellers Rank	#39 in USB Hubs
Brand	SABRENT
Built-In Media	Item
Color	Black
Compatible Devices	Desktops, Laptops
Customer Reviews	4.5 4.5 out of 5 stars (12,496)
Data Transfer Rate	5 Gigabytes Per Second
Enclosure Material	Plastic
Global Trade Identification Number	00819921011749
Hardware Interface	USB 3.0
Item Dimensions L x W x H	3.5"L x 1.5"W x 0.5"H
Item Weight	1.5 Ounces
Manufacturer	SABRENT
Mfr Part Number	HB-UMP3
Minimum Required Operating System Version	Windows 10
Model Number	HB-UMP3
Number of Ports	4
Operating System	Mac OS X and Higher
Total Usb Ports	4
UPC	819921011749
Unit Count	1.0 Count
Warranty Description	1 year limited

4 Port USB 3.0 Hub with Individual LED Lit Power Switches, Includes 5V/2.5A Power Adapter (HB-UMP3)

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