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Can you overclock the propeller with extreme measures? — Parallax Forums

Can you overclock the propeller with extreme measures?

UnknownUnknown
edited 2010-02-17 21:19 in Propeller 1
Can you overclock the propeller chip by using ethylene glycol or some kind of non conductive coolant or by using water cooling and a radiator?

http://en.wikipedia.org/wiki/Overclocking

http://www.pugetsystems.com/submerged.php



Post Edited (Chuckz) : 2/17/2010 2:07:52 PM GMT

Comments

  • KyeKye Posts: 2,200
    edited 2010-02-17 14:06
    No need. Just buy the 6.25MHZ crystals from parallax for 100Mhz operaton.

    Its been proven to work as good as 80Mhz operation.

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    Nyamekye,
  • Mike GreenMike Green Posts: 23,101
    edited 2010-02-17 14:36
    Look at the Propeller datasheet. There's a graph of maximum system clock speed vs. temperature. This was determined experimentally. For example, at -55C with a supply voltage of 3.3V, you can operate a sample of Propeller chips at 130MHz (see the datasheet for other conditions).
  • hinvhinv Posts: 1,255
    edited 2010-02-17 14:54
    I am running a 14.3818MHz crystal at pll8x, or 114.54544MHz without on a standard demoboard, There is one problem though. I cannot do 1600x1200 video and 5M*16(80MHz) can..
    This has been asked over and over again. Unfortunately, without decent search capabilities, the same questions get answered over and over again because people cannot find the answers.
    Here are some threads about overclocking:
    http://forums.parallax.com/forums/default.aspx?f=25&m=215415
    http://forums.parallax.com/forums/default.aspx?f=25&m=297000
    http://propeller.wikispaces.com/Oscillator
    http://forums.parallax.com/forums/default.aspx?f=25&m=228279

    The real question is what are you trying to accomplish? Is it higher signal frequencies? If so, overclocking might be the best way to do that. If it is more computing power for your application, might I suggest adding another propeller. Yes, there is overhead, but you could get 14 cogs instead of 8 with 2 of them tied up doing communication..

    Doug
  • Cluso99Cluso99 Posts: 18,069
    edited 2010-02-17 15:12
    RamBlades are shipping with 6.5MHz (104MHz) and I am supplying 13.5MHz (108MHz) as well although not fully tested. And yes I got 14.3818MHz running too.

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    Links to other interesting threads:

    · Home of the MultiBladeProps: TriBlade,·RamBlade,·SixBlade, website
    · Single Board Computer:·3 Propeller ICs·and a·TriBladeProp board (ZiCog Z80 Emulator)
    · Prop Tools under Development or Completed (Index)
    · Emulators: CPUs Z80 etc; Micros Altair etc;· Terminals·VT100 etc; (Index) ZiCog (Z80) , MoCog (6809)·
    · Prop OS: SphinxOS·, PropDos , PropCmd··· Search the Propeller forums·(uses advanced Google search)
    My cruising website is: ·www.bluemagic.biz·· MultiBlade Props: www.cluso.bluemagic.biz
  • UnknownUnknown
    edited 2010-02-17 15:13
    I suppose the search problem could be aided by some topics being made into sticky notes and posted in a forum.

    I think a forum for beginners might take some weight off of the general forum and promote the prop by enabling more people to use it.

    Thank you (all) for answering my question.
  • hinvhinv Posts: 1,255
    edited 2010-02-17 18:00
    I am for more stickies, but I am against splitting off a propeller beginners forum.
    The experts like Heter, BradC, PhiPi, rokiki, Mike Green, Kye, etc. lurk here with their own projects, and they are some of the best to answer questions of newbies and experienced prop programmers alike.
    If there was a beginner's forum, they would have to check there as well as with the discussions on their own projects. Plus, I like a level playing field, a classless. I admit, I am a novice, when it comes to prop programming, I don't want my posts bounced to another forum because it doesn't qualify as anything but "beginner".

    just putting in my 10 bits
    Doug

    P.S. @chuck I just noticed that you where the original poster. My rant above was not against you as some sort of "dumb" or "beginner" question, but rather at the lack of search capability. Your question is perfectly valid, and I enjoyed the links you sent as well.

    Post Edited (hinv) : 2/17/2010 6:05:27 PM GMT
  • AleAle Posts: 2,363
    edited 2010-02-17 19:32
    I think the extremest case is that of Saphieia, he runs at PLL8x using a 15 MHz crystal.

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    Visit some of my articles at Propeller Wiki:
    MATH on the propeller propeller.wikispaces.com/MATH
    pPropQL: propeller.wikispaces.com/pPropQL
    pPropQL020: propeller.wikispaces.com/pPropQL020
    OMU for the pPropQL/020 propeller.wikispaces.com/OMU
    pPropellerSim - A propeller simulator for ASM development sourceforge.net/projects/ppropellersim
  • Mike GreenMike Green Posts: 23,101
    edited 2010-02-17 19:38
    @Chuckz - There already are several "sticky threads" in this forum that are intended for beginners with everything from the Propeller Education Kit's tutorials to Graham Stabler's Good Thread Index. I'm often amazed at how many people post questions that have already been answered in one of the "sticky threads". I understand how this happens. I'm sure that, even when the search function is better with the new forum software, people will still ask common questions without looking for an existing answer.
  • Graham StablerGraham Stabler Posts: 2,510
    edited 2010-02-17 21:19
    For searching this is about as good as it gets:

    site:forums.parallax.com inurl:"f=25" servo

    Stick that in google, an example of a search for servo.

    The problem is that it does not always show the title of the thread, I don't know why this is.

    Graham
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