The main difference is the compiler that is used for compiling ffdshow.ax and thereby resulting CPU requirements:
| Build | Bit | Compiler | Requirements |
|---|---|---|---|
| Generic | 32 | Microsoft Visual C++ | Pentium II/Athlon or higher |
| 64 | Microsoft Visual C++ | 64-bit CPU and 64-bit Windows | |
| ICL | 32 | Intel C++ Compiler | SSE2-capable CPU like Pentium 4/Athlon 64 or higher |