CREATE TABLE table_name_48 (release_date VARCHAR(255), fpu_width VARCHAR(255), l2_cache VARCHAR(255), multi_1 VARCHAR(255))
What is the release date of the 2x 512 kb L2 cache with a 11x multi 1, and a FPU width of 128-bit?
    
SQL: SELECT release_date FROM table_name_48 WHERE l2_cache = "2x 512 kb" AND multi_1 = "11x" AND fpu_width = "128-bit"