Apple 6400 High Performance Module configurations, Installing the Dimm or High Performance Module

You can increase your computer’s DRAM to up to a maximum of 136 MB. Your computer already comes with 8 MB soldered on your computer’s main logic board plus 8 MB installed in one of the DIMM slots, for a total of

16 MB of DRAM. One DIMM slot remains for installing an additional 8-MB, 16-MB, 32-MB, or 64-MB DIMM, for a total of 24 MB, 32 MB, 48 MB, or 80 MB of DRAM respectively. (If you want to install the maximum amount of memory, you need to replace the 8-MB DIMM already installed in one of the DIMM slots with a 64-MB DIMM, and then install a 64-MB DIMM in the remaining slot, for a total of 136 MB of DRAM.)

IMPORTANT The DIMMs should be 64-bit wide, 168-pin fast-paged mode, with 70-nanosecond (ns) RAM access time or faster and a 1K or 2K refresh count. The Single Inline Memory Modules (SIMMs) from older Macintosh computers are not compatible with your computer and should not be used. DIMMs that support a 4K refresh count also should not be used.

If you decide to have additional DRAM installed in your computer, the DIMMs can be installed one at a time in any order in either of the memory slots.

High Performance Module configurations

A High Performance Module (level 2 memory cache) provides an overall increase in your computer’s performance. Although the megahertz processor speed stays the same when you install a High Performance Module (see your Technical Information booklet for the exact speed), your computer performs tasks significantly faster with a High Performance Module installed. You can add a High Performance Module by installing the module on the main logic board of your computer.

Installing the DIMM or High Performance Module

Installing memory involves three steps:

mopening the computer

minserting the DIMM or High Performance Module into a specific slot

mclosing the computer

Installing Additional Memory 167