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I have two Z series workstations I'm trying to use with a PCIe USB card that's rated for USB 3.1 gen 2 (10Gbps).

 

PCIe card: S1-PEX20189 (Iocrest package, based on ASMEDIA chipset). Running the latest ASMedia drivers (from 2016).

 

Z420: Rev 2 (Boot block 2013). E5-1650 v2. K600 video card. Bios settings at defaults.

Z440: E5-1650 v3, K620 video card. Bios settings at defaults.

 

Video card in each setup in slot 2.

 

I've tried slots 3-5 for the Z440 (x4,x8,x16). I've tried slots 3-4 for Z420 (x8,x8)

 

In every case, the card is recognized and drivers are assigned, but I am only getting USB 3.1 (gen 1, 5Gbps) performance (using an external USB NVMe drive in enclosure that has been benchmarked for USB 3.1 gen performance off a recent Macbook).

 

Are there any tricks here? Is this a card issue? If so, is there a card/chipset that is known to work for these systems and give USB 3.1 gen 2 performance?

 

 

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