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	B00SIQIV04
Brand Name	SABRENT
Colour	Black
Compatible Devices	Laptops, Desktops, Smartphones, Tablets, USB Flash Drives
Customer Reviews	4.4 4.4 out of 5 stars (1,796)
Data Transfer Rate	480 Megabits Per Second
Enclosure Material	Plastic
Global Trade Identification Number	00819921011732
Hardware Interface	USB 3.0
Item Weight Unit of Measure	3 Ounces
Manufacturer	Sabrent
Manufacturer Part Number	SAW48-120-4000U
Model Number	SAW48-120-4000U
Number of Ports	7
Product Features	Play, Plug
Total USB Ports	7
UPC	819921011732

SABRENT 7 Port USB 3.0 HUB + 2 Charging Ports with 12V/4A Power Adapter [Black] (HB-U930)

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