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_39045 ( "Model" text, "Processors Supported" text, "FSB/HT Frequency (MHz)" text, "Memory" text, "PCI-Express" text, "SATA" text, "PATA" text, "Sound" text )

### Question ###
What are the processors supported by a ddr2 memory and the nforce 550 model?

### Accurate SQL ###

SELECT "Processors Supported" FROM table_39045 WHERE "Memory" = 'ddr2' AND "Model" = 'nforce 550'