How many PCIe x16 Gen 3 slots does HP Z820 workstation support for graphics cards? seenagape 10 years ago How many PCIe x16 Gen 3 slots does HP Z820 workstation support for graphics cards? A.1 B.2 C.3 D.5 Explanation: http://h20195.www2.hp.com/V2/GetPDF.aspx/4AA4-3815ENW.pdf (page 1, PCIexpress I/O slot improvements) ← Previous question Next question →