Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_7 (southbridge VARCHAR, model VARCHAR)
### Question:
What shows for Southbridge when the Model number is amd-640 chipset?
### Answer:
SELECT southbridge FROM table_name_7 WHERE model = "amd-640 chipset"