Partially. Basic functions are available on all recent cards, but more exotic functions are not supported on some cards. On some old cards, like the Voodoo series, even the functions that were awailable didn't work as expected. But on recent cards the functions normally work well.

This is the reason why every effect should always have a fallback technique. The minimum A6 works with is two texture stages, and the MODULATE, MODULATE2X, ADD, and ADDSIGNED color operators. A5 mode works even with only one texture stage and the MODULATE operator only.

You can use the DirectXCapsViewer to see which functions are available on your 3D card.