Page 2 of 2 FirstFirst 12
Results 17 to 25 of 25

Thread: News - Piledriver to surpass the 4GHz barrier with Resonant Clock Mesh

  1. #17
    Moosing about! CAT-THE-FIFTH's Avatar
    Join Date
    Aug 2006
    Location
    Not here
    Posts
    32,039
    Thanks
    3,910
    Thanked
    5,224 times in 4,015 posts
    • CAT-THE-FIFTH's system
      • Motherboard:
      • Less E-PEEN
      • CPU:
      • Massive E-PEEN
      • Memory:
      • RGB E-PEEN
      • Storage:
      • Not in any order
      • Graphics card(s):
      • EVEN BIGGER E-PEEN
      • PSU:
      • OVERSIZED
      • Case:
      • UNDERSIZED
      • Operating System:
      • DOS 6.22
      • Monitor(s):
      • NOT USUALLY ON....WHEN I POST
      • Internet:
      • FUNCTIONAL

    Re: News - Piledriver to surpass the 4GHz barrier with Resonant Clock Mesh

    Quote Originally Posted by Scribe View Post
    Interestingly, Intel does power down cores completely, AMD transistor tech doesn't (or at least didn't) allow them to turn a core off completely so its TurboCORE lowers the clock instead.
    Bulldozer has power gated cores,Llano does not.

    An interesting observation I made is that Bulldozer power idle power consumption when overclocked actually does not increase hugely.

  2. #18
    Senior Member
    Join Date
    Jun 2004
    Location
    Kingdom of Fife (Scotland)
    Posts
    4,991
    Thanks
    393
    Thanked
    220 times in 190 posts
    • crossy's system
      • Motherboard:
      • ASUS Sabertooth X99
      • CPU:
      • Intel 5830k / Noctua NH-D15
      • Memory:
      • 32GB Crucial Ballistix DDR4
      • Storage:
      • 500GB Samsung 850Pro NVMe, 1TB Samsung 850EVO SSD, 1TB Seagate SSHD, 2TB WD Green, 8TB Seagate
      • Graphics card(s):
      • Asus Strix GTX970OC
      • PSU:
      • Corsair AX750 (modular)
      • Case:
      • Coolermaster HAF932 (with wheels)
      • Operating System:
      • Windows 10 Pro 64bit, Ubuntu 16.04LTS
      • Monitor(s):
      • LG Flattron W2361V
      • Internet:
      • VirginMedia 200Mb

    Re: News - Piledriver to surpass the 4GHz barrier with Resonant Clock Mesh

    Quote Originally Posted by Scribe View Post
    Interestingly, Intel does power down cores completely, AMD transistor tech doesn't (or at least didn't) allow them to turn a core off completely so its TurboCORE lowers the clock instead.
    Didn't know that Intel also did it "properly". Note that reducing the power-demand/clock-speed is not the same as actually cutting the power off to a core - so I'll argue that if this is what AMD are doing then they aren't actually doing it right. Afaik the later model PowerPC chips (pretty sure Power6, not sure about Power5+) actually do reroute power away from unused cores - very clever, and I've no idea how they do this.

    Sorry that this is - strictly speaking - off topic, but it seemed relevant at the time.

    Career status: still enjoying my new career in DevOps, but it's keeping me busy...

  3. #19
    radix lecti dave87's Avatar
    Join Date
    Sep 2005
    Location
    England
    Posts
    12,806
    Thanks
    657
    Thanked
    931 times in 634 posts
    • dave87's system
      • Motherboard:
      • Asus
      • CPU:
      • i5 3470k under Corsair H80 WC
      • Memory:
      • 8gb DDR3
      • Storage:
      • 240gb SSD + 120gb SSD
      • Graphics card(s):
      • Asus HD7950
      • PSU:
      • XFX 600w Modular
      • Case:
      • Lian Li PC-A05FNB + Acoustipack
      • Operating System:
      • Windows 10 Pro
      • Monitor(s):
      • 2x Dell S2309W (1920x1080)
      • Internet:
      • BT Infinity Option 2

    Re: News - Piledriver to surpass the 4GHz barrier with Resonant Clock Mesh

    Quote Originally Posted by kalniel View Post
    Of course he does. You're just used to seeing the big heXus avatar and 'lowe' username
    Quote Originally Posted by CAT-THE-FIFTH View Post
    Two Hexus accounts??
    Two different Lowes

  4. Received thanks from:

    kalniel (28-02-2012)

  5. #20
    Moosing about! CAT-THE-FIFTH's Avatar
    Join Date
    Aug 2006
    Location
    Not here
    Posts
    32,039
    Thanks
    3,910
    Thanked
    5,224 times in 4,015 posts
    • CAT-THE-FIFTH's system
      • Motherboard:
      • Less E-PEEN
      • CPU:
      • Massive E-PEEN
      • Memory:
      • RGB E-PEEN
      • Storage:
      • Not in any order
      • Graphics card(s):
      • EVEN BIGGER E-PEEN
      • PSU:
      • OVERSIZED
      • Case:
      • UNDERSIZED
      • Operating System:
      • DOS 6.22
      • Monitor(s):
      • NOT USUALLY ON....WHEN I POST
      • Internet:
      • FUNCTIONAL

    Re: News - Piledriver to surpass the 4GHz barrier with Resonant Clock Mesh

    Quote Originally Posted by crossy View Post
    Didn't know that Intel also did it "properly". Note that reducing the power-demand/clock-speed is not the same as actually cutting the power off to a core - so I'll argue that if this is what AMD are doing then they aren't actually doing it right. Afaik the later model PowerPC chips (pretty sure Power6, not sure about Power5+) actually do reroute power away from unused cores - very clever, and I've no idea how they do this.

    Sorry that this is - strictly speaking - off topic, but it seemed relevant at the time.
    Bulldozer has power gating - cores can be powered down.

    In fact when overclocked an FX8150 seems to have lower low idle power consumption than an overclocked Core i5 2500K or Core i7 2600K:

    http://hardocp.com/article/2011/10/1...mance_review/9

    http://www.tweaktown.com/articles/43...w/index10.html

    http://www.bit-tech.net/hardware/cpu...8150-review/10

    Most reviews did not look at overclocked idle power consumption.
    Last edited by CAT-THE-FIFTH; 28-02-2012 at 04:04 PM.

  6. Received thanks from:

    crossy (28-02-2012)

  7. #21
    Banhammer in peace PeterB kalniel's Avatar
    Join Date
    Aug 2005
    Posts
    31,023
    Thanks
    1,870
    Thanked
    3,381 times in 2,718 posts
    • kalniel's system
      • Motherboard:
      • Gigabyte Z390 Aorus Ultra
      • CPU:
      • Intel i9 9900k
      • Memory:
      • 32GB DDR4 3200 CL16
      • Storage:
      • 1TB Samsung 970Evo+ NVMe
      • Graphics card(s):
      • nVidia GTX 1060 6GB
      • PSU:
      • Seasonic 600W
      • Case:
      • Cooler Master HAF 912
      • Operating System:
      • Win 10 Pro x64
      • Monitor(s):
      • Dell S2721DGF
      • Internet:
      • rubbish

    Re: News - Piledriver to surpass the 4GHz barrier with Resonant Clock Mesh

    Quote Originally Posted by crossy View Post
    Didn't know that Intel also did it "properly". Note that reducing the power-demand/clock-speed is not the same as actually cutting the power off to a core - so I'll argue that if this is what AMD are doing then they aren't actually doing it right. Afaik the later model PowerPC chips (pretty sure Power6, not sure about Power5+) actually do reroute power away from unused cores - very clever, and I've no idea how they do this.

    Sorry that this is - strictly speaking - off topic, but it seemed relevant at the time.
    Both AMD and Intel fully cut the power to inactive cores. This is called power gating.

  8. #22
    HEXUS webmaster Steve's Avatar
    Join Date
    Nov 2003
    Posts
    14,283
    Thanks
    293
    Thanked
    841 times in 476 posts

    Re: News - Piledriver to surpass the 4GHz barrier with Resonant Clock Mesh

    Actually, power gating is a bit more general than that. Power gating is removing Vdd to a bunch of transistors by putting a gate in between the supply rail and the transistors in question. There's usually a few transistors that form the power gate. It's the same principle as clock gating... except it's for power.

    The granularity at which you apply the gating is the interesting part. Gate off too much in a single swoop and you get weird in-rush effects when you try to charge it all back up too quickly. For example, you might want to power gate your FPU when the decoder sees there are no FPU u-ops in the instruction buffer. Question is how quickly can you power the FPU back up when you see an instruction will need it? It's probably not going to be a single cycle.

    I've no idea what the mechanism for power gating at the core-level is, nor how extensive it really is. For example, do registers stay powered to preserve state, or is it lost?

  9. #23
    Senior Member watercooled's Avatar
    Join Date
    Jan 2009
    Posts
    11,478
    Thanks
    1,541
    Thanked
    1,029 times in 872 posts

    Re: News - Piledriver to surpass the 4GHz barrier with Resonant Clock Mesh

    I was going to say maybe they're flushed to a higher level cache but even those can be gated IIRC, so maybe they stay powered?

    Llano can do power gating, just not individual cores: http://www.anandtech.com/show/4444/a...apu-a8-3500m/4

    Edit: It seems power gating-enabled CPUs have specific 'retention registers' so I was half right: http://en.wikipedia.org/wiki/Power_g...tion_registers

  10. #24
    HEXUS webmaster Steve's Avatar
    Join Date
    Nov 2003
    Posts
    14,283
    Thanks
    293
    Thanked
    841 times in 476 posts

    Re: News - Piledriver to surpass the 4GHz barrier with Resonant Clock Mesh

    Yeah, lack of per-core low power states (i.e. just having per-socket control) was something that people were bemoaning at the HPC conference I was at the other week.

    You can put things like registers and caches into a low power state where you preserve data but cannot access it until you bring the supplies back up to nominal. That in itself presents its own power distribution and design verification issues.
    PHP Code:
    $s = new signature();
    $s->sarcasm()->intellect()->font('Courier New')->display(); 

  11. #25
    Senior Member
    Join Date
    Jun 2004
    Location
    Kingdom of Fife (Scotland)
    Posts
    4,991
    Thanks
    393
    Thanked
    220 times in 190 posts
    • crossy's system
      • Motherboard:
      • ASUS Sabertooth X99
      • CPU:
      • Intel 5830k / Noctua NH-D15
      • Memory:
      • 32GB Crucial Ballistix DDR4
      • Storage:
      • 500GB Samsung 850Pro NVMe, 1TB Samsung 850EVO SSD, 1TB Seagate SSHD, 2TB WD Green, 8TB Seagate
      • Graphics card(s):
      • Asus Strix GTX970OC
      • PSU:
      • Corsair AX750 (modular)
      • Case:
      • Coolermaster HAF932 (with wheels)
      • Operating System:
      • Windows 10 Pro 64bit, Ubuntu 16.04LTS
      • Monitor(s):
      • LG Flattron W2361V
      • Internet:
      • VirginMedia 200Mb

    Re: News - Piledriver to surpass the 4GHz barrier with Resonant Clock Mesh

    Fascinating thread - thanks all.

    Career status: still enjoying my new career in DevOps, but it's keeping me busy...

Page 2 of 2 FirstFirst 12

Thread Information

Users Browsing this Thread

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

Posting Permissions

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