Assuming that the system bus runs at 100 ghz and the bus width is 4 bytes, how long would it take to send a 1 gbyte file?

Data flowing through system bus per second =frequency * no. of bytes per sample.

Here, sample= bus width*no. of bytes= 4 bytes. Total bytes flowing through system bus= 100GHz * 4=400GBps.

Now we need to find the no. of seconds for 1GB to pass through system bus.

=1GB/400GBps =1/400 sec= 0.0025 sec.

Explanation:

The answer is self explanatory.