how many l2 cache has a clock speed to tdp ratio of 46.7?
CREATE TABLE "sortable_table" (
  "core" text,
  "processor" text,
  "model" text,
  "clock_speed" text,
  "l2_cache" text,
  "voltage" text,
  "tdp" text,
  "clock_speed_to_tdp_ratio_m_hz_w" text
);
SELECT COUNT("l2_cache") FROM "sortable_table" WHERE "clock_speed_to_tdp_ratio_m_hz_w"='46.7';