IBM System x3650 M3 16These options have the following descriptions:69Y4236 upgrades models with four hot-swap HDD bays to eight hot-swap HDD bays. This optionrequires a ServeRAID M1015, M5014, or M5015.59Y3825 upgrades models with eight hot-swap HDD bays to 16 hot-swap HDD bays. This optionincludes a SAS expander card that fits into a dedicated RAID slot, and RAID controller occupies oneof the four PCIe slots, limiting the number of available slots to three.69Y5034 upgrades models with eight hot-swap HDD bays to 16 hot-swap HDD bays. This optionincludes two ServeRAID M5015 RAID controllers (without batteries). The number of available PCIeslots is three.59Y3806 upgrades models with eight hot-swap HDD bays to eight hot-swap HDD bays plus aninternal tape drive (DDS5, DDS6, or RDX). This includes the riser card with USB and SAS tapeconnectors, replacing the standard SAS RAID riser card.