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by adrian_b 292 days ago
The Transputer as an implementation has failed, but all modern server/workstation CPUs have followed the Transputer model of organizing the CPU interfaces, starting with some later models of the DEC Alpha, followed by AMD Athlon and then by all others.

Unlike the contemporaneous CPUs and many later CPUs (which used buses), the Transputer had 3 main interfaces: a memory interface connecting memory to the internal memory controller, a peripheral interface and a communication interface for other CPUs.

The same is true for the modern server/workstation CPUs, which have a DRAM memory interface, PCIe for peripherals and a proprietary communication interface for the inter-socket links.

By inheriting designers from DEC Alpha, AMD has adopted this interface organization early (initially using variants of HyperTransport for peripherals and for inter-CPU communication), while Intel, like always, has been the last in adopting it, but they were forced to do this eventually (in Nehalem, i.e. a decade after AMD), because their obsolete server CPU interfaces reduced too much the performance.