Editing Binary prefix (section)

==== Data and clock rates ====
Computer [[Clock signal|clock]] frequencies are always quoted using SI prefixes in their decimal sense. For example, the internal clock frequency of the original [[IBM PC]] was {{val|4.77|u=MHz}}, that is {{val|4770000|u=Hz}}.

Similarly, digital information transfer rates are quoted using decimal prefixe. The [[Parallel ATA]] "{{val|100|u=MB/s}}" disk interface can transfer {{val|100000000}} bytes per second, and a "{{val|56|u=Kb/s}}" modem transmits {{val|56000}} bits per second. Seagate specified the sustained transfer rate of some hard disk drive models with both decimal and IEC binary prefixes.<ref name="seaga2011" /> 
The standard sampling rate of music [[compact disk]]s, quoted as {{val|44.1|u=kHz}}, is indeed {{val|44100}} samples per second.{{citation needed|date=August 2023}} A "{{val|1|u=Gb/s}}" [[Ethernet]] interface can receive or transmit up to 10<sup>9</sup> bits per second, or {{val|125000000}} bytes per second within each packet. A "[[56k]]" modem can encode or decode up to {{val|56000}} bits per second.

Decimal SI prefixes are also generally used for [[computer bus|processor-memory data transfer]] speeds. A [[PCI-X]] bus with {{val|66|u=MHz}} clock and 64 bits wide can transfer {{val|66000000}} 64-bit words per second, or {{val|4224000000|u=bit/s}} = {{val|528000000|u=B/s}}, which is usually quoted as {{val|528|u=MB/s}}. A [[DDR SDRAM|PC3200]] memory on a [[double data rate]] bus, transferring 8 bytes per cycle with a clock speed of {{val|200|u=MHz}} has a bandwidth of {{nowrap|{{val|200000000}} × 8 × 2}} = {{val|3200000000|u=B/s}}, which would be quoted as {{val|3.2|u=GB/s}}.