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    Firewire Ground

    Hi Rubycon, Thanks. Makes sense. Sadly it's not available in domestic premises in the UK, and maybe not at all. Peter
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    Firewire Ground

    Good question. In fact we tried both the F'Wire port on the back IO panel and the front port connected to a header via an internal cable. It made no difference at all. Incidentally, the internal cable is in fact well shielded - each twisted pair has it s own shield, plus a third shield for...
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    Firewire Ground

    Hi Rubicon, I'm afraid I don't understand: How many systems are we talking obout here. 100s, 1000s. This is a rare problem: you need a big sample to have any confidence that an absense of any issues is statistically significant. What, please is "fully balanced power". I know what...
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    Firewire Ground

    Hi Modelworks, Thank you. You post moves the discussion forward. Is it possible, though, that the F'Wire cable is in fact picking up RF interferance being put out by the Graphics Card? As it happens I'm in the UK, so I need a 240VAC unit, but now I know the sort of thing to look...
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    Firewire Ground

    Hi, Yes - I have thought of cutting the ground on either the PC of the FF800. It's a bit of a performance, as the leads are fully moulded - I'd probably use an extension lead with an ordinary plug so I could take it apart and disconnect the earth. I will try that, but I don't expect it...
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    Firewire Ground

    The F'Wire cable seems pretty well shielded, but I've ordered a ferrit core to see it it helps. Thanks. Peter
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    Firewire Ground

    Hi, The Motehbaord uses a TI chipset for F'Wire, but I'll give it a shot, thanks. Peter
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    Firewire Ground

    Hi Rubycon, Indeed, obvioulsy. That is what I would have thought. But it seems that in fact the ground is always required. Once I had identified the problem, I found a number of people on the net reporting the same finding. Hence my question: What is the ground being used for...
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    Firewire Ground

    No Indeed I would not expect it to. There may be some statistical relationship between noisy cards in the sense you use it, and silent EMF production that teh F'Wire cable is reacting to, but it is stistical, no necessary. This is a rare problem - you'd need 100s of noisy 8800s all using...
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    Firewire Ground

    Hi, The interface is a RME Fireface 800. The Motherhboard is an Intel DP35DP The Graphics Card (which is the most likely culprit to be pushing out the EMF in teh first place) is a GigaByte 8600GT. Yes - I have tried several different cables (and cut one up to check it was...
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    Firewire Ground

    Hi, The noise occurrs whenver any significant change is made to the screen. This is a professional Audio setup. All the analogue cables are already balanced. A 6 pin F'wire cable does indeed supply power, but this is not being used. The system works fine if you cut the (white) power...
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    Firewire Ground

    Hi, I have a firewire cable that is completing a ground loop, and causing a lot of nasty noise. The Firewire cable is connecting a PC to an external sound card with its own power supply and its own connection to the mains, so I tried cutting the ground in the cable. But it seems theat...
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    17ms Screen refresh rate tech question

    Hi, I'm unsure what you mean by a "timed image" in this context, but I suspect it does not matter. AFAIK the screen collects a complete image and writes the whole of it to the display matrix and leaves it ther for teh refresh period while it organizes the next image. Peter
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    The Future of Kernels, Operating Systems, and "Tech"

    Hi, The answer to that is simple. As well as the increased development costs, the result would be unsable and slow. If Word and Photoshop both had their own HD driver (for example) there is no way they would co-operatre properly. They would lock eachother out, steal eachother's IRQs and...
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    The Future of Kernels, Operating Systems, and "Tech"

    Hi, To answer the original question: The basic structure will never change. The reason for this is that the basic structure is not driven by technology, but by the fundmantal nature of a computer as a tool used by humans. What we have is: Hardware OS: Device Drivers, Event...
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    Dynamic spatial data structures

    Hi, It's a long time since I did any programming, but if I were tackling this problem I think I'd build the data structure myself to exactly meet the requirements. I would devide the space into rectalinear regions (i.e square in 2-D, cube in 3-D) and then hold an Object Location Table...
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    Why does stuff exist? Where did we come from?

    Hi, Yes. That explains quite a lot of things if you accept the existance of a Multiverse, in which many Universes exist and where each Univrese potentially has different laws of physics, or at least different vaules for some of the key constants. Given that, of course we inhabit a...
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    Why does stuff exist? Where did we come from?

    Why do you assume that anybody or any thing had to mnake the laws of physics. Religion aside, I see no such need. Peter
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    Why does stuff exist? Where did we come from?

    Scientific View: Our Universe was created in an event called teh big bang which is entirely possible under the laws of physics as we currently understand them. As I understand it the total energy in teh Universe is zero, so the instantaneuos creation and subsequent persistance of a...
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    Tricky tricky coins

    Just give us some harder questions then... Peter
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    Another math problem

    Hi, Independant drawing yes - but they are linked as they share the father. The question is whether the conditional value of the prbability of the sex of the child remains constant at the nominal 50/50 for the unconditional value once we know that the father has at least two male...
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    Another math problem

    You are asserting by your example that the chances of the third coin coming down heads or tails is independant of the other two coins/results. A better analogy would be one coin flipped three times: same father, same coin. The more times the coin turns up heads with no tails, the more...
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    Another math problem

    The order of the children's birth is irrelevant because we don't know it. Conditional probability is contingent on known information. We are no longer assuming a 50/50 split becaue we alrady know the answer tho that question, and because it is the unconditional probability and we have additional...
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    Another math problem

    Oh but they do. Not by much, bu the fact that a man has two sons out of two children (the man determines the sex of the child) clearly increases the probability that he is predisposed to father sons rather than daughters because of some medical (or other?) condition. Suppose you ran in to...
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    Another math problem

    Yes - the point I'm making is that the fact that he has two sons out of three children increases the chances he has some medical condition that pre-disposes him to have sons rather thatn daughters. The original assumption that the chances of a male and female child are both 50% is an...
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    Another math problem

    Actually... that's not absolutley correct. My answer of 75% is wrong because the fact that a man is known to have at least two male children out of 3 must impact the probablitly of the sex of the third child. Peter
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    Another math problem

    Hi, Sorry... but even if they know the correct answer (and who's to say that 75% is correct) they can still discuss why it right or wrong and get confused. Alternatively ask a difficult question, and I endevour to post a plausible but incorrect answer. Peter
  28. P

    Another math problem

    75% Peter
  29. P

    Interesting math question

    Hi, Simulations can have bugs at least as often as proofs are invalid.... I tried to produce a genuine proof, but without the matematics and symbolic logic fonts it is almost impossible. I've posted the result twice now, and it sems pretty obvious to me. You get to it by doing one...
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    Interesting math question

    Hi, I don't write java but I do write in other laguages. I'm trying to figure what this code is meant to achieve. We already know the answer - 2 x (n - (2 * ((ceiling n log (2) n) - 1))) note: 2 * ((ceiling n log (2) n) - 1) merely finds the largest power of two less than n and I...
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    Interesting math question

    Suppose there are n cards in the deck, numbered 1 (top card) to n (bottom card). n >1 Define m as the largest power of 2 less than n The last card wil be card number (n-m)x2 Peter
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    Mac vs. PC in scientific computing

    Hi, 4 million numbers only requires a fairly small amount of RAM in comparison with 1GB. So the process shuold be entirely CPU bound. It's just possible that a well complied version would run twice the speed of a less well optimized version, but it seems extreme. I'd suggest...
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    Quiet Cases

    Yeah! I hope to upload the User Manual and some better diagrams/pics to-night or to-morrow. Mike C at silentpcrewiew will get one asap, but at the moment we cannot make as many as people are asking for - and they are not even officially available yet. Peter
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    Quiet Cases

    Hi, Absolutley True. But possibly misleading. The case is not a source of noise, but it is your central strategy for minimizing the noise. The general layout of the case determines how the air flows through the casem and how nuch cooling each componnet gets, and in what oeder...
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    Working Model of the Universe

    Hi, The Perfectly Smooth Elephant (whose weight may be neglected but whose gravitas certainly cannot) has submited a proposal for government funding to construct a Working Model of the Universe See: http://forums.anandtech.com/messageview...atid=50&threadid=1971863&enterthread=y for...
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    Most Quiet Case??

    Hi, Mine. http://www.paq.ltd.uk We hope to be open for busimness later this month, but the production process is only jyust coming together and we have a backlog. Peter
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    Deconstructing naturalism... is naturalism perfectly coherent?

    Hi, As it happens, I do broadly beleive this theory. By "broadly" I mean that I fully accept that our knowledge is far from complete, and some details will change; but I'm confident that we are on the right path. I see nothing in the theory I summarized that could possibly "disprove...
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    Deconstructing naturalism... is naturalism perfectly coherent?

    Hi, This is what I was taught in school, but that was 40+ years ago, the model may have developed since then. As f95toli has already pointed out the total energy in the universe is zero and remains at zero. There are many forms of energy and a complete audit is beyond my...
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    quiet case fans?

    Hi, depends on what you mean by "quiet". I'd say that anything spinning below 500rpm is quiet, not 1500. I no longer allow any fans running at over 1000 rpm in an of my PCs even under sustained 100% load. Peter
  40. P

    Front and Rear fans

    Because if you did that the exhaust fan would no longer be close to the CPU. If you read my post it says.. The conventional ATX case (bottom front in, top back out) withe the CPU close to the exhaust fan) was designed that way for a reason. Specifically, the air path traverses the case...