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
Links
Manufacturer Finder
Newsletter
RSS Feed
Test Your Skills
Twitter
Newsletter
Subscribe today!
Search


Home » CPU
Inside the Intel Haswell Microarchitecture
Author: Gabriel Torres 22,774 views
Type: Tutorials Last Updated: May 31, 2013
Page: 3 of 5
New Dispatch Ports and Execution Units

From the Nehalem microarchitecture on, Intel CPUs have six dispatch ports to connect the CPU’s Reservation Station (where microinstructions awaiting to be processed are stored) to the CPU’s execution units. The Haswell microarchitecture adds two new dispatch ports, increasing the number of microinstructions the Reservation Station can send to the execution units by 33%.

The Haswell microarchitecture has a total of 17 execution units, while the Sandy Bridge and Ivy Bridge microarchitectures have 15 and the Nehalem microarchitecture has 12.

An important enhancement added to the Haswell microarchitecture is the addition of 256-bit datapaths between the Reservation Station and the execution units. The Sandy Bridge and Ivy Bridge microarchitectures use 128-bit datapaths and, therefore, when 256-bit AVX instructions have to be executed, two execution engines must be combined. This doesn’t happen with the Haswell microarchitecture.

Haswell
click to enlarge
Figure 2: New dispatch ports and execution units of the Haswell microarchitecture

Print Version | Send to Friend | Bookmark Article « Previous |  Page 3 of 5  | Next »

Related Content
  • All Core i3 Models
  • Inside the Intel Ivy Bridge Microarchitecture
  • Core i7-3770K vs. AMD FX-8150 and Core i7-2600K CPU Review
  • ECS Z87H3-A2X Extreme Motherboard
  • Intel DZ87KLT-75K Motherboard

  • RSSLatest Content
    ASUS ZenFone 5 Smartphone Review
    October 15, 2014 - 7:00 PM
    ASUS AM1M-A Motherboard
    October 15, 2014 - 4:30 AM
    ASRock X99 Extreme4 Motherboard
    October 14, 2014 - 4:10 AM
    Cooler Master Elite 130 Case Review
    October 9, 2014 - 2:46 AM
    ASUS RAMPAGE V EXTREME Motherboard
    October 7, 2014 - 2:50 AM
    ASRock Fatal1ty X99M Killer Motherboard
    October 6, 2014 - 5:40 AM
    ASUS X99-DELUXE Motherboard
    September 30, 2014 - 1:07 AM
    MSI GT70 2PE Dominator Pro Laptop Review
    September 25, 2014 - 1:15 AM







    2004-14, Hardware Secrets, LLC. All rights reserved.
    Advertising | Legal Information | Privacy Policy
    All times are Pacific Standard Time (PST, GMT -08:00)