2-Tier · 8-Plane · 1.6T/GPU · 200G SerDes

GPU Compute Fabric BOM Calculator

2-Tier Backend Fabric · Nokia 7220 IXR-H5-64O · 8 GPUs/Server · 32 Servers/SU

Cluster Size
Number of GPUs 1024 GPUs
256 (1 SU) 1024 2048 4096 8192 (32 SU)
1,008 (1 SU) 16,128 (16 SU) 32,256 (32 SU) 64,512 (64 SU) 129,024 (128 SU)
Custom (any ×256)
NIC & GPU Configuration
Per-GPU NIC / Fabric Plane Mode
NIC Vendor (within mode)
GPU Platform
✅
Architecture Summary
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Bill of Materials
Component Role / Side Qty
GPU × NIC Compatibility
GPU Platform BCM Thor2 (400G, PCIe Gen5) NVIDIA CX7 (400G, PCIe Gen5) NVIDIA CX8 (800G, PCIe Gen6) BCM 800G (future / TBD)
✓ Vendor-validated pairing △ Feasible · suboptimal (over- or under-provisioned) … Future / not generally shipping
All combinations are SerDes-compatible with the H5-64O (Tomahawk 5): 800G OSFP cages run 4×200G PAM4 (CX8) or break out to 2×400G as 4×100G PAM4 (CX7 / Thor2). Compatibility is about vendor validation, host PCIe generation, and bandwidth balance — not signaling.
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