Table schema:
CREATE TABLE table_name_79 (fsb_ht_frequency__mhz_ VARCHAR, sata VARCHAR, memory VARCHAR)

Question: Which FSB/HT frequency (MHz) has a SATA larger than 6 and DDR 266/333/400 Registered/ECC memory?
SQL: SELECT fsb_ht_frequency__mhz_ FROM table_name_79 WHERE sata > 6 AND memory = "ddr 266/333/400 registered/ecc"