Table: cpu_power
Columns: core
processor
model
clock_speed
l2_cache
voltage
tdp
clock_speed_to_tdp_ratio_mhz_w

Question: how many l2 cache has a clock speed to tdp ratio of 46.7?
SQL: SELECT COUNT("l2_cache") FROM cpu_power WHERE "clock_speed_to_tdp_ratio_mhz_w" = '46.7'