All in all, this increments the instruction throughput without getting out of hand.Īdditionally and due to its RISC nature, this CPU also includes dedicated units to speed up specific computations :.In the 750CXe, FPU operations are divided into three more stages (7 stages in total) while load-store operations are divided into two (5 stages in total).

Four-stage pipeline (with bonus): Here is a previous introduction to instruction pipelining.

Integrated FPU with 32-bit and 64-bit registers: Accelerates operations with floats and doubles.

External 64-bit data bus: While the ISA can fit in a 32-bit bus, we still need to move other longer types (explained in the next section) without hitting performance penalties.

Two Integer Units: Combined with super-scalar and out-of-order, it basically increments the number of integer operations done per unit of time.

Out-of-order execution: The CPU can re-order the sequence of instructions to keep all of its units working, thus increasing efficiency and performance.Super-scalar: More than one instruction can now be executed in each stage of the pipeline.The 750CXe implements the v1.10 specification. PowerPC ISA: Without going into much detail, it’s another 32-bit RISC instruction set.Let’s find out what makes Gekko so special, and to do that we need to first have to look at the offerings of the 750CXe: The result was the PowerPC Gekko and runs at 486 MHz. The resulting product is a series of processors carrying the name PowerPC, which were selected to power 99% of Apple’s Macintoshes and some embedded systems.įast forward, Nintendo required something powerful but cheap, so to comply with those red lines, IBM grabbed one of its past designs, the PowerPC 750CXe (found on the late iMac G3, known as the Early-Summer 2001), and beefed it up with capabilities that would please game developers. A promising candidate seems to be IBM: Apart from their famous work on mainframes, they recently allied with Motorola and Apple to create a CPU powerful enough to compete with Intel’s ruling in the PC market.

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