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_80 (pci_express VARCHAR, memory VARCHAR, model VARCHAR)
### Question:
What is the PCI-express with a ddr2 memory and a nforce 520 model?
### Answer:
SELECT pci_express FROM table_name_80 WHERE memory = "ddr2" AND model = "nforce 520"