Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_65221 ( "Model number" text, "sSpec number" text, "Cores" text, "Frequency" text, "Turbo" text, "L2 cache" text, "L3 cache" text, "GPU model" text, "GPU frequency" text, "Socket" text, "I/O bus" text, "Release date" text, "Part number(s)" text, "Release price ( USD )" text )

### Question ###
What's the part number of the processor that has an 1.8 ghz frequency and 2 256 kb L@ Cache?

### Accurate SQL ###

SELECT "Part number(s)" FROM table_65221 WHERE "L2 cache" = '2 × 256 kb' AND "Frequency" = '1.8 ghz'