Apple eventually came the the conclusion that Power Computing was much more interested in taking market share away from Apple than in expanding the market in general. Apple killed off cloning just as it was about to really take off, putting an end to what it felt was largely a parasitic relationship. The 604e was the faster successor to the 604 and has twice as much L1 cache as the 604. To take advantage of the faster processor a 1MB L2 cache was included with the machines. The PowerTower Pro machines shipped with 16MB of RAM which is expandable to 768MB in the 12 DIMM slots.
Memory is capable of interleaving for slightly better processor performance.
For graphics the machines had one of the fastest graphics cards of the time, the IMS Twin Turbo, with 8MB of graphics memory. The PowerTower Pros have 6 PCI slots. The basic drive that shipped with the machines was a fast 2GB 7200 RPM AV drive, however there was a RAID option consisting of two 4GB drives which provided even better performance for those that required it. The CD-ROM drive is 8X. Below you will find the MacBench 4.0 results for most of the processor upgrades available for this machine. These results are what the individual manufactures publish for their cards.