CREATE TABLE table_39044 ("Model" TEXT, "Processors Supported" TEXT, "FSB/HT Frequency  ( MHz ) " TEXT, "Memory" TEXT, "PCI-Express" TEXT, "SATA" TEXT, "PATA" TEXT, "Sound" TEXT)

Which processors are supported with a PCI-express of x16: 1 slot x1: 4 slots and the nforce 550 model?
SELECT "Processors Supported" FROM table_39044 WHERE "PCI-Express" = 'x16: 1 slot x1: 4 slots' AND "Model" = 'nforce 550'
SELECT "Processors Supported" FROM "table_39044" WHERE "Model" = 'nforce 550' AND "PCI-Express" = 'x16: 1 slot x1: 4 slots'