CREATE TABLE table_73603 ("Code name" TEXT, "Brand name" TEXT, "Model  ( list ) " TEXT, "Frequency" TEXT, "Cores/Threads" TEXT, "Max Memory Speed" TEXT)

What brand is model G6xxx?
SELECT "Brand name" FROM table_73603 WHERE "Model (list)" = 'G6xxx'
SELECT "Brand name" FROM "table_73603" WHERE "Model (list)" = 'G6xxx'