The 120 MHz Power Mac 6300 and Performa 6320 replaced the 100 MHz Performa 6300 ‘s 100 MHz 603e CPU with a 120 MHz 603e.

To save money, Apple based the x200 motherboard on the Quadra 605 with its 25 MHz system bus and 32-bit memory, even though the 603 is a 64-bit chip. Apple also used an 8-bit IDE controller for the hard drive instead of the more expensive SCSI used in earlier Macs. (This is the kind of thinking that had crippled the LC with a 32-bit CPU on a 16-bit bus five years earlier.)

Because of unusual architecture, installing a 25-pin SCSI terminator to the SCSI port (if you have no SCSI devices attached) will improve network stability. Also, if you are using a serial printer and no modem, connect the printer to the modem port to avoid network problems.

Specs (via Low End Mac)

• Cpu: 120 MHz PPC 603e
• Bus: 40 MHz
• Performance: 48,860 Whetstones
• Ram: 16 MB, expandable to 64 MB using two 72-pin 80ns SIMMs, installing RAM in pairs of identical speed gives slightly more efficient performance
• Rom: 4 MB
• L2 Cache: 256 KB
• Hard Drive: 1.2 GB IDE
• Vram: 1 MB, supports up to 800 x 600 resolution
• Gestalt Id: 42
• Adb: 1 port for keyboard and mouse
• Scsi: DB-25 connector on back of computer
• Weight: 19 pounds
• Cd-Rom: 8x
• Microphone: standard 3.5mm minijack, compatible with line-level input including Apple’s PlainTalk microphone
• Internal Hd Format: Cannot See IDE Drives (Apple Knowledge Base 18360) notes that due to changes in the way modern IDE drives are formatted at the factory, early versions of Apple HD SC Setup (ones that come with System 7.5.1 and earlier) will not recognize them. You should boot System 7.5.2 or later and use Drive Setup 1.0.3 or higher with these drives.