Compatibility of ATI Radeon HD 2400 XT & VisionTek Radeon x1550

Compatibility of ATI Radeon HD 2400 XT & VisionTek Radeon x1550

I recently added another video card to my workstation - VisionTek Radeon x1550 in addition to ATI Radeon HD 2400 XT that I already had. I was wondering if there is any definitive way to know if there could be any compatibility issues with them?