CREATE TABLE table_name_11 (pci_express VARCHAR, memory VARCHAR, sound VARCHAR)

Which PCI-Express has a DDR 266/333/400 Registered/ECC memory and Enhanced AC'97 2.3 sound?
SELECT pci_express FROM table_name_11 WHERE memory = "ddr 266/333/400 registered/ecc" AND sound = "enhanced ac'97 2.3"
SELECT "pci_express" FROM "table_name_11" WHERE "ddr 266/333/400 registered/ecc" = "memory" AND "enhanced ac'97 2.3" = "sound"