Each DIMM can contain 256 and 512 MB (also is capable of 128 MB, 1 GB, and has future expansion ability of 2 GB) of double data rate synchronous dynamic RAM (DDR SDRAM). At least one pair of the RAM expansion slots contains factory installed DIMMs. The Power Mac G5 supports CAS latencies of 2, 2.5, 3, 4, and 5.
Additional DIMMs must be installed in the slots in pairs of the same size. The slot pairs are numbered as indicated in Figure 4-1 and Figure 4-2. When installing additional memory, populate starting with the lowest slot pair numbers. The combined memory of all of the DIMMs installed is configured as a contiguous array of memory.
