Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_3894 ( "Model - Computer name" text, "CPU type" text, "No. of processors" text, "Period of operation" text, "Maximum peak performance ( Teraflops )" text, "Use" text )

### Question ###
Name the total number of model for amd opteron dual-core 2.6ghz

### Accurate SQL ###

SELECT COUNT("Model - Computer name") FROM table_3894 WHERE "CPU type" = 'AMD Opteron dual-core 2.6GHz'