Table schema:
CREATE TABLE table_name_48 (release_date VARCHAR, fpu_width VARCHAR, l2_cache VARCHAR, multi_1 VARCHAR)

Question: 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"