We have heard that the SPEC board does not seem to be detected in certain modern motherboards. It may be that certain motherboards that have PCIe Gen 3 slots that are not compatible to the GN4124 that is PCIe 1.1. Apparently PCIe Gen 2 slots work OK.

We bought a new PC HP Pavillion 500-232d. I tried to setup there my SPEC plus fine delay. I installed Ubuntu 12.04 LTS with Kernel version 3.11.0-23. However when I plug in my SPEC card and do lspci my spec card is not shown.

We had similar problems with a Supermicro X9SAE-V-4U. It could only detect the SPEC if there was a single card inserted. As soon as we inserted another one, both disappeared. We tried all possible permutations (it has 3 or 4 pcie slots) and BIOS configurations. The final fix was that we changed to another motherboard.

Added above text to the SPEC FAQ