> What Intel graphics cards are you referring to? The oldest Intel graphics card I > tested was an Intel HD 3000, which worked.
Intel HD 3000 (and even 2X00) are a part of the Core series.
Oldest Core Intel HD graphics products dates back to ~Jan 2011; well over 5 years ago. Integrated Intel graphics older than that being utilized, a system is very likely SOL for D3D/HLSL.