Advantech PCA-6186 user manual Memory Installation Procedures, Cache Memory

1.8.1Sample calculation: DIMM memory capacity

Suppose you install a 512 MB DIMM into your PCA-6186's socket 1 and a 512 MB DIMM into sockets 2. Your total system memory is 1 GB, cal- culated as follows:

Table 1.6: DIMM memory capacity sample calculation

Socket number	184-pin DIMM memory			Total
				Memory
1	512 MB	x	1	512 MB
2	512 MB	x	1	512 MB
Total memory	1 GB

1.9 Memory Installation Procedures

To install DIMMs, first make sure the two handles of the DIMM socket are in the "open" position. i.e. The handles lean outward. Slowly slide the DIMM module along the plastic guides on both ends of the socket. Then press the DIMM module right down into the socket, until you hear a click. This is when the two handles have automatically locked the mem- ory module into the correct position of the DIMM socket. To remove the memory module, just push both handles outward, and the memory mod- ule will be ejected by the mechanism in the socket.

1.10 Cache Memory

Since the second-level (L2) cache has been embedded into the Intel® socket 478 Pentium® 4/Celeron™ processor, you do not have to take care of either SRAM chips or SRAM modules. The built-in second-level cache in the processor yields much higher performance than the external cache memories. The cache size in the Intel ® Pentium ® 4 processor is 512 KB. In the Celeron CPU, the cache size is 128KB.

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