question: Which processors are supported with a PCI-express of x16: 1 slot x1: 4 slots and the nforce 550 model?
answer: SELECT processors_supported FROM table_name_82 WHERE pci_express = "x16: 1 slot x1: 4 slots" AND model = "nforce 550"
context: CREATE TABLE table_name_82 (processors_supported VARCHAR, pci_express VARCHAR, model VARCHAR)