CREATE TABLE table_19205 ("Designation" TEXT, "Bus width  ( bits ) " FLOAT, "Channels" TEXT, "Clock rate  ( MHz ) " FLOAT, "Bandwidth  ( MB/s ) " FLOAT)

Name the number of clock rate mhz when bandwidth mb/s is 2400
SELECT COUNT("Clock rate (MHz)") FROM table_19205 WHERE "Bandwidth (MB/s)" = '2400'
SELECT COUNT("Clock rate (MHz)") FROM "table_19205" WHERE "Bandwidth (MB/s)" = '2400'