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The 768535-B21 is an HPE ProLiant XL250a Gen9 double-width 2P accelerator tray with 1.0 m rear-cabled hot-plug drives and 12G drive support. The 12G hot-plug drive cage (794875-001) holds a 4-SFF backplane with the power, LED and SUV assembly module and its cables, and a separate cage (794878-001) takes 2 SFF drives in the XL250a.
Two system I/O boards cover the processor generations: 786718-001 supports Intel Xeon E5-2600 v3 (Haswell) processors with 12Gb/s backplane support, and 834374-001 is the 2-port board for Intel Xeon E5-26xx v4 (Broadwell) processors. Both come with an alcohol pad and a thermal grease syringe, and the processors on either board must share the same spare part number.
Further parts are the x16 2U PCIe rear riser (794876-001), the x16x8 2U PCIe riser (794877-001), the power/signal board (794880-001), the 2U power expander (738764-001), a power signal cable for 2 SFF drives (794879-001) and a cable that connects the hard drive to the power board (794881-001). The air baffle is 779140-001, its baffle bracket for the XL250a is 841158-001 and the Apollo 6000 input/output ALOM dummy blank is 774727-001. More Apollo and ProLiant trays are in HPE server systems.
| Part number | 768535-B21 |
| Name | HPE ProLiant XL250a Gen9 Double-Width 2P Accelerator Tray |
| Drives | 1.0 m rear-cabled hot plug, 12G |
| Drive cage | 12G hot-plug, 4-SFF backplane, 794875-001 |
| Second drive cage | 2 SFF drives, 794878-001 |
| System I/O board (Xeon E5-2600 v3) | 786718-001 |
| System I/O board (Xeon E5-26xx v4) | 834374-001 |
| PCIe risers | x16 2U rear, 794876-001; x16x8 2U, 794877-001 |
| Power | power/signal board 794880-001; 2U power expander 738764-001 |
| Air baffle | 779140-001; baffle bracket 841158-001 |
| Compatible with | Intel Xeon E5-2600 v3 (Haswell) processors (board 786718-001); Intel Xeon E5-26xx v4 (Broadwell) processors (board 834374-001) |