CREATE TABLE table_21674 ("Name" TEXT, "Raw bandwidth  ( Mbit/s ) " FLOAT, "Transfer speed  ( MB/s ) " TEXT, "Max. cable length  ( m ) " TEXT, "Power provided" TEXT, "Devices per channel" TEXT)

Name the power provided for transfer speed mb/s is 1250
SELECT "Power provided" FROM table_21674 WHERE "Transfer speed (MB/s)" = '1250'
SELECT "Power provided" FROM "table_21674" WHERE "Transfer speed (MB/s)" = '1250'