And what about the Sonnet Quaddoubler 
Plug the Sonnet QuadDoubler™ processor upgrade card into a Macintosh Quadra or Centris and double your computer's speed. The QuadDoubler features a high-quality Motorola 68040 processor with FPU, ideally suited for graphic applications, spreadsheets, web browsing, and complex mathematical calculations.
Featuring a fast 100/50 MHz 68040 processor with FPU, the QuadDoubler is compatible with your existing hardware and software. A lower cost 80/40 MHz 68040 processor is used in the QuadDoubler for the Centris 610 and Workgroup Server 60/20. The QuadDoubler fully supports Mac OS 8.1, allowing you to take advantage of features and capabilities previously unavailable in the Mac
