Model: All Aureal Vortex 1 & Vortex 2 boards
Operating System: Windows 95 & Windows 98 (Note: might work with other versions of this os.)
Run at an MS-Dos prompt it will return the chip ID, whether it's a Vortex 1 or a Vortex 2 sound chip.
Handy if you don't know what you have !!