Results 1 to 6 of 6

Thread: How Quad-pumped bus works ??

  1. #1
    Amateur photographer Hans Voralberg's Avatar
    Join Date
    Dec 2004
    Location
    Birmingham
    Posts
    1,889
    Thanks
    1
    Thanked
    11 times in 11 posts

    How Quad-pumped bus works ??

    As teh title, i always wonder how Intel quad-pumped bus work. I understand that DDR transfer 2 bits per cycle using the up and down of the signal curve, but 4 bits ?? How they do that
    Primary kit:
    Fuji S5 Pro - Nikkor AF 50/1.8 - Nikkor AF 85/1.8
    Epson RD-1

    Film Kit:
    Leica M3 - Summicron 50/2 DR - Zeiss ZM 25/2.8 - M-Rokkor 40/2

    Olympus OM2n - Zuiko 50/2 Macro - Zuiko 50/1.4 - Zuiko 35/2.8

  2. #2
    OMG!! PWND!!
    Join Date
    Dec 2003
    Location
    In front of computer
    Posts
    964
    Thanks
    0
    Thanked
    0 times in 0 posts
    Well, its more, Intel doing nothing new, just naming something differently..

    I BELIEVE, that its just DDR and Dual Channel, and Intel's marketing have gone and said, "Two duals equals a quad!!"
    Last edited by Applecrusher; 11-08-2005 at 02:01 PM.

  3. #3
    Senior Member
    Join Date
    Jan 2005
    Location
    Manchester
    Posts
    2,885
    Thanks
    67
    Thanked
    177 times in 132 posts
    • Butcher's system
      • Motherboard:
      • MSI Z97 Gaming 3
      • CPU:
      • i7-4790K
      • Memory:
      • 8 GB Corsair 1866 MHz
      • Storage:
      • 120GB SSD, 240GB SSD, 2TB HDD
      • Graphics card(s):
      • MSI GTX 970
      • PSU:
      • Antec 650W
      • Case:
      • Big Black Cube!
      • Operating System:
      • Windows 7
    It's not DDR+Dual channel. A quad-pumped bus can be transfer data 4 times per clock per channel. AGP 4x is another example of a quad-pumped bus.

    The specifics seem unclear, but I'd assume rather than using rising and falling edges, they just multiply up the clock frequency at the bus interface.

  4. #4
    Registered User
    Join Date
    Aug 2005
    Posts
    8
    Thanks
    0
    Thanked
    0 times in 0 posts
    Intel CPUs are "quad pumped", meaning they send 4 instructions per clock cycle. This means that if you see an FSB of 800MHz, the underlying FSB speed is really only 200MHz, but it is sending 4 instructions per clock cycle so it achieves an effective speed of 800MHz.

    this is...

  5. #5
    PMM
    PMM is offline
    Member
    Join Date
    Jul 2003
    Location
    Playing in Cyber Space
    Posts
    191
    Thanks
    0
    Thanked
    2 times in 1 post
    qdr ram has unlike DDr ram 2 bi-directional read / write ports effectively
    doubleing the transfer rate.

    also mean's more wires between the ram and the controller.

    But mean's for every read it can write at the same time were I believe DDR its a either
    or setup.

  6. #6
    Member
    Join Date
    Aug 2003
    Posts
    73
    Thanks
    0
    Thanked
    0 times in 0 posts
    It achieves 4 data transfers per clock by using two clocks which are 90 degrees out of phase. Data is transferred on the rising and falling edges of each clock. This is called quadrature clocking. In fact IIRC there are 4 clocks - each clock is a differential pair so there is the clock and its complementary clock.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. How Digital Audio works
    By Lowe in forum Audio Visual
    Replies: 23
    Last Post: 12-04-2013, 09:16 AM
  2. Itanium 2 gets beefed up bus
    By Steve in forum HEXUS News
    Replies: 0
    Last Post: 18-07-2005, 05:31 PM
  3. Quad layer?
    By Mike Fishcake in forum Help! Quick Relief From Tech Headaches
    Replies: 5
    Last Post: 22-06-2005, 06:11 PM
  4. k7s5a SM bus controller... driver?
    By |{££|" in forum PC Hardware and Components
    Replies: 11
    Last Post: 12-01-2005, 09:15 AM
  5. More Redoute codes !
    By Scooby in forum Retail Therapy and Bargains
    Replies: 17
    Last Post: 31-08-2004, 06:14 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •