Agreed 100%, the older Renesas parts seem to be less reliable. I’ve got a Haswell box with both Renesas and Intel root hubs, as well as one of the cheaper Startech expansion cards which has a Renesas chipset itself. It runs an FX3-based spectrum analyzer (not from SH but similar to the BB60C) that works fine on all of the USB 3 ports except the ones attached to the built-in Renesas hub. The SA has never worked on the Sandy Bridge box, at least for more than thirty seconds or so.
I haven’t tried the VSG60A on any of the motherboard ports on that system, but I’d expect similar results. I imagine the secret to SuperSpeed success with the older 3.0 chipsets is a large FIFO backing up the FX3, but who knows.
The new 1.06 build took care of the problem, so that was definitely what was going on. Thanks for the help! It’d be great to have the option to verify data delivery to the hardware as well. If/when you are able to add that I’d be glad to give it a try.