220-801 · Question #136
Which of the following is the maximum throughput of a USB 3.0 connection?
The correct answer is C. 4.8 Gbps. USB 3.0 (SuperSpeed) has a theoretical maximum signaling rate of 5 Gbps, which translates to an effective throughput of 4.8 Gbps after encoding overhead.
Question
Which of the following is the maximum throughput of a USB 3.0 connection?
Options
- A800 Mbps
- B3 Gbps
- C4.8 Gbps
- D10 Gbps
How the community answered
(66 responses)- A5% (3)
- B3% (2)
- C91% (60)
- D2% (1)
Why each option
USB 3.0 (SuperSpeed) has a theoretical maximum signaling rate of 5 Gbps, which translates to an effective throughput of 4.8 Gbps after encoding overhead.
800 Mbps is approximately the throughput of FireWire 800 (IEEE 1394b), not USB 3.0.
3 Gbps is not a defined USB specification throughput; it may be confused with SATA II but does not apply to USB 3.0.
USB 3.0 uses 8b/10b encoding, meaning 10 bits are transmitted for every 8 bits of data - this overhead reduces the raw 5 Gbps signaling rate to an effective maximum data throughput of 4.8 Gbps.
10 Gbps is the throughput of USB 3.1 Gen 2 (SuperSpeed+), a later revision that doubled the USB 3.0 speed.
Concept tested: USB 3.0 maximum throughput specification
Source: https://www.usb.org/sites/default/files/USB%203.1%20vs%203.0.pdf
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