Hardware Secrets

Home | Camera | Case | CE | Cooling | CPU | Input | Memory | Mobile | Motherboard | Networking | Power | Storage | Video | Other
Content
Articles
Editorial
First Look
Gabriel’s Blog
News
Reviews
Tutorials
Main Menu
About Us
Awarded Products
Datasheets
Dictionary
Download
Drivers
Facebook
Forums
Links
Manufacturer Finder
Newsletter
On The Web
RSS Feed
Test Your Skills
Twitter
Newsletter
Subscribe today!
Search
Recommended
Upgrading and Repairing PCs (21st Edition)
Upgrading and Repairing PCs (21st Edition), by Scott Mueller (Que Publishing), starting at $24.28



Home » CPU
Everything You Need to Know About The QuickPath Interconnect (QPI)
Author: Gabriel Torres
Type: Tutorials Last Updated: August 25, 2008
Page: 1 of 4
Introduction

Since the beginning of times Intel CPUs use an external bus called Front Side Bus or simply FSB that is shared between memory and I/O requests. The next generation of Intel CPUs will have an embedded memory controller and thus will provide two external busses: a memory bus for connecting the CPU to the memory and an I/O bus to connect the CPU to the external world. This bus is a new bus called QuickPath Interconnect (QPI) and in this tutorial we will be explaining how it works.

On Figures 1 and 2 we are comparing the traditional architecture used by Intel CPUs and the new architecture that will be used by Intel CPUs with an integrated memory controller.

Front Side Bus Architecture
click to enlarge
Figure 1: Architecture used by current Intel CPUs.

QuickPath Interconnect (QPI)
click to enlarge
Figure 2: Architecture used by Intel CPUs with embedded memory controller.

This is exactly the same idea that AMD has been using since 2003, when they released their first Athlon 64 CPU. Currently all CPUs from AMD have an integrated memory controller and they use a bus called HyperTransport to make the I/O communications. Though QuickPath Interconnect and HyperTransport have the same goal and work in a very similar fashion, they are not compatible.

By the way, technically speaking both QuickPath Interconnect and HyperTransport aren’t busses but a point-to-point connection. A bus is a set of wires that allows several components to be connected to it at the same time, while a point-to-point connection is a path connecting only two devices. Even though it is technically wrong call these connections “busses,” we will keep calling them this way for simplicity and also to facilitate the comprehension of the text by laymen that call these connections this way.

We will now explain you how the QuickPath Interconnect works. If you are interested you can read our tutorial The HyperTransport Bus Used By AMD Processors to compare these two external busses.

Page 1 of 4  | Next »
Print Version | Send to Friend | Bookmark Article | Comments (7)

Related Content
  • Everything You Need to Know About the HyperTransport Bus
  • Inside Intel Nehalem Microarchitecture
  • All Core i7 Models
  • Core i5-750 and Core i7-870 Processors Review
  • All Core i3 Models


  • RSSLatest News
    LUXA2 Releases New P1-PRO Battery Power Pack
    October 1, 2013 - 7:23 AM PST
    MSI unveils GP70 and GP60 Laptops
    September 30, 2013 - 7:23 AM PST
    AMD Unveils Next-Generation Radeon Graphics Cards
    September 27, 2013 - 5:33 AM PST
    Genius Introduces Energy Mouse in North America
    September 27, 2013 - 5:32 AM PST
    Apple Updates iMac
    September 25, 2013 - 5:27 AM PST
    .:: More News ::.







    2004-13, Hardware Secrets, LLC. All rights reserved.
    Advertising | Legal Information | Privacy Policy
    All times are Pacific Standard Time (PST, GMT -08:00)