Apple 256KB Cache DIMM 820-0719-B Power Macintosh 8500 333-0178 M8APS3330178D

Apple 256KB Cache DIMM 820-0719-B Power Macintosh 8500 333-0178 M8APS3330178D

This is a genuine Apple 256KB Cache DIMM (part number 820-0719-B) designed specifically for the Power Macintosh 8500. It provides the secondary cache memory the Power Mac 8500 uses to improve processor throughput by reducing the latency between the PowerPC CPU and main RAM.

Specifications & What's Included

• Manufacturer: Apple Computer Inc.
• Part Number: 820-0719-B
• Apple Product Number: 333-0178
• Module ID: M8APS3330178D
• Type: Cache DIMM (L2 secondary cache)
• Capacity: 256KB
• Memory Technology: SRAM
• Form Factor: DIMM (proprietary Apple connector)
• Compatible System: Apple Power Macintosh 8500
• Memory Chips: Mitsubishi MT 5LG320
• Board copyright date: 1995; module date code 9707 (~early 1997)
• Module only — no original packaging

Applications

The Power Macintosh 8500, introduced by Apple in 1995, was a high-end desktop in the Power Mac 8500/9500 tower line, built around the PowerPC 604 processor. Like other Power Mac towers of this generation, it used a dedicated cache DIMM slot to hold secondary (L2) SRAM cache separate from main DRAM — a design common in mid-1990s professional Macintosh systems. The 256KB cache DIMM slots into a proprietary connector on the logic board and is not interchangeable with standard PC DIMM memory. This module is primarily sought today by collectors and technicians restoring or maintaining Power Mac 8500 systems, where a missing or failed cache DIMM can noticeably affect system performance.