Michael,
We recommend this USB card to our customers. We know it works with our products.
It’s important to know that the number of USB host controllers can affect performance. Each host controller is a 5Gbps link that is shared between 1 or more ports. Most PCs have 1 controller for all available ports. The card I linked above has 2 controllers, where the 2 ports on the left are shared between 1 controller and the two ports on the right the other.
In general if you are running our devices at full data rates (I/Q streaming), you can run 1 or 2 simultaneously on one controller without data loss. It depends on the USB hardware. That means you will need 2-4 controllers for your setup. If you aren’t running them all simultaneously, then this won’t affect you as much.
You might also find a 4 physical core CPU to be insufficient if running 4 simultaneously. I personally haven’t done this before, but I know some customers how have (with high core count Xeon processors).
If you find a configuration that works, let us know, we would love to be able to share with other customers.
Andrew