The Math Behind Lots of Devices on a USB Hub

I've been searching for a solid answer for this, but haven't found anything conslusive.

Basically, I am getting a powered 7-port USB 3.0 hub, but I am plugging devices that are important or are high-data devices—such as a graphics tablet for professional work (important), and a 1080p webcam. I am wondering if the 7-port USB hub will be overpowered, in terms of loss of transfer speed, due to the number of devices or the number of demanding devices, and if data transfer speed of any of the devices on the hub will be affected because of this.

So, with hard numbers/facts, how much can a powered 7-port USB 3.0 hub handle without causing any loss of speed whatsoever for the devices (not counting external hard drives)? And, arround how much bandwidth would 7 devices (graphics tablet and 1080p webcam out of those devices, as well as mouse, keyboard, printer, etc.) if theoretically used all at the same time?

Solution 1:

Keyboard, mice, audio, and USB2 pen drives have no effect on operations of USB 3.0 channel - these USB2 devices go through ABSOLUTELY SEPARATE hardware, a USB 2.0 hub that is built inside the USB 3.0 hub, leaving the USB 3.0 bandwidth untouched. Please see the USB 3.1 specifications, Section 3.1, figure 3-1, page 3-2. The text says, "The USB 3.1 system architecture (Figure 3-1) is comprised of two simultaneously active buses: a USB 2.0 bus and an Enhanced SuperSpeed bus."

A 1080P HD webcam (30fps) takes about 60 Mbps of effective bit rate, or maybe 2-3% of the available USB 3.0 bandwidth. It does not seem something to worry about.

Therefore, the rest of USB 3.0 bandwidth on the 7-port hub will be available for your "graphics tablet" for your professional work, with all hard data/facts you provided.