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In systems with AMD processors, what allows communication between processors and the I/O subsystem?
A. Northbridge
B. Southbridge
C. HyperTransport link
D. APIC
E. QuickPath Interconnect
Correct Answer: C
Explanation/Reference:
Industry Standard Architecture – Student Guide 1 – Page 37
AMD processors are able to communicate with each other through HyperTransport point-to-point links. This enables one processor to access the memory connected to another processor.
Inside the processor, a crossbar switch connects the processor, memory controller, and HyperTransport links.
AMD processors also use HyperTransport links to connect to the I/O subsystem. The links on particular processors are connected to I/O tunnels that support the I/O devices.
All other processors can communicate with the I/O system through the HyperTransport links.
Legacy devices are also connected to one of the I/O tunnels.
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