CREATE TABLE table_14257 ("Model number" TEXT, "sSpec number" TEXT, "Cores" FLOAT, "Frequency" TEXT, "Turbo" TEXT, "L2 cache" TEXT, "L3 cache" TEXT, "GPU model" TEXT, "GPU frequency" TEXT, "Socket" TEXT, "I/O bus" TEXT, "Release date" TEXT, "Part number ( s ) " TEXT, "Release price  (  USD  ) " TEXT)

what is the release date when the sspec number is sr15h(c0)?
SELECT "Release date" FROM table_14257 WHERE "sSpec number" = 'sr15h(c0)'
SELECT "Release date" FROM "table_14257" WHERE "sSpec number" = 'sr15h(c0)'