Which PCI-Express has a DDR 266/333/400 Registered/ECC memory and Enhanced AC'97 2.3 sound?
CREATE TABLE "comparison_of_nvidia_chipsets" (
  "model" text,
  "processors_supported" text,
  "fsb_ht_frequency_m_hz" text,
  "memory" text,
  "pci_express" text,
  "sata" real,
  "pata" real,
  "sound" text,
  "network" text,
  "features" text
);
SELECT "pci_express" FROM "comparison_of_nvidia_chipsets" WHERE "memory"='ddr 266/333/400 registered/ecc' AND "sound"='enhanced ac''97 2.3';