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I/O module 1 and I/O module 2 each support a PCIe riser module, 2 x 3.5" rear-drive module, or 
module with 2 x 2.5" rear drives and one PCIe riser module. 
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I/O module 3 supports a PCIe riser module or 4 x 2.5" rear-drive module. 
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For details about the OCP 3.0 network adapter, see 5.1.6.1 OCP 3.0 Network Adapters . 
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The figure is for reference only. The actual configuration may vary. 
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Server with four GPUs on the rear panel 
Figure 5-20 Rear view