CREATE TABLE table_38740 ("Model" CLOB, "Processors Supported" CLOB, "FSB/HT Frequency  ( MHz ) " CLOB, "Memory" CLOB, "PCI-Express" CLOB, "SATA" FLOAT, "PATA" FLOAT, "Sound" CLOB, "Network" CLOB, "Features" CLOB)

Which PCI-Express has a DDR 266/333/400 Registered/ECC memory and Enhanced AC'97 2.3 sound?
SELECT "PCI-Express" FROM table_38740 WHERE "Memory" = 'ddr 266/333/400 registered/ecc' AND "Sound" = 'enhanced ac''97 2.3'
SELECT "PCI-Express" FROM "table_38740" WHERE "Memory" = 'ddr 266/333/400 registered/ecc' AND "Sound" = 'enhanced ac''97 2.3'