V4 - not compatible PCIe Gen3?
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