CREATE TABLE table_39046 ("Model" CLOB, "Processors Supported" CLOB, "FSB/HT Frequency  ( MHz ) " CLOB, "Memory" CLOB, "PCI-Express" CLOB, "SATA" CLOB, "PATA" CLOB, "Sound" CLOB)

What is the PCI-express with a ddr2 memory and a nforce 520 model?
SELECT "PCI-Express" FROM table_39046 WHERE "Memory" = 'ddr2' AND "Model" = 'nforce 520'
SELECT "PCI-Express" FROM "table_39046" WHERE "Memory" = 'ddr2' AND "Model" = 'nforce 520'