MicroMac 604 PowerBoy
The MicroMac PowerBoy Accelerator for PowerMac and Performa 6100-series models increases the speed up to 200% by employing a 120MHz to 132MHz 604 PowerPC processor and a 256KB level-2 cache. The PowerBoy accelerator runs at twice the frequency of your existing 6100-series Macintosh. If your 601-processor runs at 60MHz, the PowerBoy accelerator will run at 120MHz, if you presently run at 66MHz, the PowerBoy will run at 132MHz.