Acer 900 User Manual page 17

1.8 Second-level Cache Upgrade
The system supports synchronous pipeline burst second-level cache.
The system board has an exclusive 160-pin socket for the
synchronous pipeline burst cache module. The cache module socket
supports either a 256 KB or 512 KB 3.3V cache module.
Follow these steps to install a cache module:
1. Position the cache module on top of the socket such that its
component side faces the CPU.
2. Insert the cache module carefully until the golden finger of the
module fit into place.
Figure 1-9 Installing a Synchronous Cache Module
System Board 1-17