Early Blender benchmarks suggest that two NVIDIA GeForce RTX 3080 cards would outperform a single GeForce RTX 3090 had NVIDIA included NVLink support - NotebookCheck.net News
AORUS GeForce RTX NVLINK™ BRIDGE FOR 30 SERIES Key Features | Graphics Card - GIGABYTE Global
EVGA - Asia - Products - EVGA GeForce RTX NVLink SLI Bridge for RTX 3090, 4-Slot Spacing, 100-2W-0130-LR - 100-2W-0130-LR
NVIDIA Reserves NVLink Support For The RTX 3090 | TechPowerUp
EVGA GeForce RTX NVLink SLI Bridge for RTX 3090 4-Slot Spacing (100-2W-0130-LR) for sale online | eBay
NVIDIA GeForce RTX NVLink HB Bridge 4-Slot for 30/3000 Series 3090 SLI HB NEW | eBay