If your workload runs on one or two Xeon servers, it probably isn't worth considering something like this. If your workload runs on racks of Xeon servers, it might be.

Then the question is, which hardware delivers the right balance of CPU, memory and IO bandwidth for the lowest capital and operating costs.

Also for what it is worth, each card has 60Gbps of general IO bandwidth, and another 48Gbps of SATA disk bandwidth.