Hypertransport vs. the Qpi

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  • Topic: HyperTransport, OSI model, Intel QuickPath Interconnect
  • Pages : 5 (1539 words )
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  • Published : March 29, 2013
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AMD vs. Intel round 10,802,304|
HyperTransport vs. the QPI|
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11/30/2011|
Problem #3

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TABLE OF CONTENTS

Introduction………………………………………….……………………………………………2 HyperTransport Consortium………………………………………………………………………3 Intel’s QuickPath Interconnect (QPI)…………………………………………………………......4 Summary…………………………………………………………………………………...……...6 Works Cited……………………………………………………………………………………….7

“You are the weakest link, goodbye” chided Anne Robinson hostess of the game show ‘The Weakest Link’, and with hanging head a contestant would shrink off the stage. Flavors of the Von Neumann bottle neck, an issue that could be likened to Boston traffic congestion, one of the first contestants, can be found everywhere in the realm of technology. The system bus the other communication highway has historically been ‘the weakest link’, rather a source of bottlenecks, traffic jams, in the hardware of a computer. The great battle of one-ups-man-ship between top chip companies has led to crashing prices and amazing increases in CPU speeds, but CPUs share communication hardware with slower devices and as a result CPUs are often waiting around for the data and instructions they need to do what they need to do. Boston’s ‘Big Dig’ construction project widened existing highways: three and four lanes to five and six lanes, added alternate routes: tunnels, expanded the airport and railroads: faster channels and direct routes. Since the original ‘system bus’, “You are the weakest link, goodbye”, all these methodologies have been implemented, but each has its limitations, sacrifices. Solutions to flavors of this problem since the original ‘system bus’ include a front and rear side bus architecture, caching, and dedicated routes have been added: direct memory access technologies. Technology again faces the latest incarnation of this problem. With multi-processor and multi-core architectures the CPU is not only competing with primary memory, secondary memory, input devices, and output devices, they are also competing with other CPUs or cores whichever the case, all trying to get their point across! The solutions offered today are coined QuickPath by Intel, and HyperTransport by AMD, a detailed description of each is explained below. HyperTransport

HyperTransport was developed due to the need to support higher speed processors and memories. The technology was influenced by the need for PCI (Peripheral Component Interconnect) compatibility with a low cost implementation (Hyper 5). The technology was developed in 2001 and far exceeded current technology of the time. The first HyperTransport 1.03 could support an aggregate bandwidth up to 12.8 Gigabyte/second and in mid 2004 it almost doubled to 22.4 Gigabyte/second (Hyper 2). Not only does this technology deliver raw bandwidth, “HyperTransport provides the integral interconnect backbone structure that links all of the core functional units (processor, memory and I/O elements) in a board-level system” (Hyper 5). HyperTransport delivered the best possible solution with scalable performance that couldn’t be matched. It offers point-to-point unidirectional data links, one for input and one for output. Each data link, called a daisy chain, can contain up to 32 HyperTransport-enabled devices and separate daisy chains can be added to the first making it a tree structure through switches, bridges and devices. Through switches and bridges, HyperTransport is able to link other interconnect technologies and support PCI ordering with host-based traffic routing conventions (Hyper 8). A traditional link is single ended wire and with electrical noise can corrupt the signal detection. Every LVDS line has two wires as stated earlier and is referred to as twin wire lines or balanced lines. They are opposite in polarity and carry equal signals in amplitude. This creates a high immunity to noise from the machines other components and the transmission range is maximized. It is much less static due to...
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