Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_25839957_5 (shader_model VARCHAR, core_clock___mhz__ VARCHAR)
### Question:
How many shader models have a 900 core clock ( mhz )?
### Answer:
SELECT COUNT(shader_model) FROM table_25839957_5 WHERE core_clock___mhz__ = "900"