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
Best Sellers Rank	845 in Computers & Accessories ( See Top 100 in Computers & Accessories ) 16 in USB Hubs
Brand Name	SABRENT
Colour	Black
Compatible Devices	Card Readers, Desktops, Digital Cameras, Headphones, Keyboards, Laptops, Monitors, Mouse, Printers, Scanners, Smartphones, Tablets, USB Flash Drives
Country of Origin	China
Customer Reviews	4.5 4.5 out of 5 stars (25,038)
Data Transfer Rate	5 Gigabytes Per Second
Enclosure Material	Acrylonitrile Butadiene Styrene (ABS)
Global Trade Identification Number	00819921011749
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
Total USB Ports	4
UPC	819921011749
Unit Count	1.0 count

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)

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