PCIe lane calculator: how many GPUs can I actually run?
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NewToServersOP
1d ago#1
I'm confused about PCIe lanes. I want to run 4x RTX 4090s for rendering on a Threadripper PRO system. The CPU has 128 PCIe lanes. Does that mean I can run 4x GPUs at full x16 bandwidth? Or is there overhead from the platform?
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PCIeGuru
1d ago#2
With 128 lanes on a Threadripper PRO, yes you can technically run 4x GPUs at x16 each (4×16=64 lanes) with lanes left over for NVMe and other devices. The WRX90 platform routes lanes efficiently. Just make sure your motherboard has 4 physical x16 slots.