Or, more precisely, two partial AltiVec units. The G5 CPU has two arithmetic logic units (ALUs), two double-precision floating point units, two load/store units, and two AltiVec units. The G5 has separate 32-bit read and write double data rate (DDR) data buses. This gives the G5 much faster access to system memory. Where the PowerPC G4 used much slower memory on a 100, 133, or 167 MHz data bus, the G5 accesses system memory at one-half or, at worst, one-third of CPU speed. IBM was the only manufacturer of G5 CPUs. Only three different versions of the chip were produced before Apple made the move to Intel CPUs in 2006. It was first used when the Power Mac G5 was introduced in June 2003. The G5 is a 64-bit member of the PowerPC processor family that is fully compatible with 32-bit code.
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