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_91 (processors_supported VARCHAR, memory VARCHAR, model VARCHAR)
### Question:
What are the processors supported by a ddr2 memory and the nforce 550 model?
### Answer:
SELECT processors_supported FROM table_name_91 WHERE memory = "ddr2" AND model = "nforce 550"