The PCIE standard is pretty backwards compatible. I’m sure you could stick that 660 Ti in any x86 computer that supports PCIE today (even the highest end), and probably will be able to for the next few generations to come.

It will still perform like a 660 Ti, of course, so don’t expect much in terms of performance.

While reaching conformance is quite the performance, conformance doesn’t mean performance.

So it works, but they still need to make it fast.