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For best performance, you should install memory in sets of three matching modules, as the CPU can access up to 3 channels of memory at once. The PowerPC 604e was the first Mac processor available in a symmetric multiprocessing (SMP) configuration. There are two base 2010 models, a single-CPU Mac Pro that ships with 3 GB of RAM and supports up to 48 GB, and a dual-CPU Mac Pro that ships with 6 GB of RAM and supports up to 128 GB. The PowerPC 601 was the first Mac processor to support the 32-bit PowerPC instruction set architecture.Ī Motorola PowerPC 603 processor Processor

The MC68LC040 version was less expensive because it omitted the floating-point unit. The Motorola 68040 has improved per-clock performance compared to the 68030, as well as larger instruction and data caches, and was the first Mac processor with an integrated floating-point unit. Another improvement over the 68020 was the addition of a data cache. The Motorola 68030 was the first Mac processor with an integrated paged memory management unit, allowing for virtual memory.