Advantech PCE-5120 user manual System Memory, Memory Installation Procedures, Cache Memory

1.9 System Memory

The PCE-5120 has four sockets for 240-pin dual inline memory modules (DIMMs) in two memory channels.

All these sockets use 1.8 V unbuffered double data rate synchronous DRAMs (DDR SDRAM). They are available in capacities of 256, 512 and 1024 MB. The sockets can be filled in any combination with DIMMs of any size, giving a total memory size between 256 MB and 4 GB.

1.9.1 CPU FSB and memory speed

The PCE-5120 can accept DDR2 SDRAM memory chips without parity. Also note: The PCE-5120 accepts DDR2 400/533/667MHz SDRAM. The PCE-5120 does NOT support ECC (error checking and correction).

1.10 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.

1.11 Cache Memory

The CPU that PCE-5120 supports built-in 4 MB (for Core™ 2 Duo), 2 x 1024KB/2 x 2048KB cache memory (for Pentium D CPU), and 1024KB/ 2048KB (for Pentium 4 CPU), and 256KB/512 KB (For Celeron D CPU) full-speed L2 cache. The built-in second-level cache in the processor yields much higher performance than conventional external cache memo- ries.

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