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Geek Culture / hyperthreading on Core 2 Duo

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Phaelax
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Posted: 30th Dec 2006 01:29
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Why isn't there any? I've read somewhere that it is included on the chip but is disabled.

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Nicholas Thompson
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Posted: 30th Dec 2006 01:37
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Why would you need it? Isn't hyperthreading just a way to fool apps into thinking there are multiple processors? The advantage was that the processor was able to swap between two processes when one went into a "wait state" to save on wasted CPU cycles... I THINK... Not sure...

Basically I'm trying to say is - why do you need to simulate two CPU's on a dual core machine? Surely it'd slow it down?

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Phaelax
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Posted: 30th Dec 2006 01:51 Edited at: 30th Dec 2006 01:53
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From wiki:
Quote: "The advantages of Hyper-Threading are listed as: improved support for multi-threaded code, allowing multiple threads to run simultaneously, improved reaction and response time, and increased number of users a server can support"


It's not really a big issue, now that we have dual core 64-bit cpus, but I was just curious as to why they wouldn't continue to use it if it provided enhance performance.


Hmm, I should've read Wiki earlier.

Quote: "More recently Hyper-Threading has been branded as energy inefficient. For example, specialist low power CPU design company ARM has stated SMT can use up to 46% more power than dual CPU designs. Furthermore, they claim SMT increases cache thrashing by 42%, whereas dual core results in a 37% decrease[1]. These considerations are claimed to be the reason Intel has dropped SMT from new cores."


I suppose that answers my question. If anyone has anything to add on this, share it.

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indi
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Location: Earth, Brisbane, Australia
Posted: 30th Dec 2006 02:02
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Windows XP 64 is a total joke right?
incompatibility madness with 32 bit drivers.
lack of dos based based games and applications
Let alone to the two versions of it
Whos got an Itanium processor?
Windows on Windows emulation layer, Pfft lol

Mac OSX is pure 64 bit pwnage for years now as well, ahh get it right Bill.G and ill think about it.

Hyperthreading appears to work with some dual cores
http://www.intel.com/technology/computing/dual-core/
http://www.webopedia.com/DidYouKnow/Hardware_Software/2005/dual_core.asp
http://reviews.zdnet.co.uk/hardware/components/0,1000001694,39193811,00.htm

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Raven
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Posted: 30th Dec 2006 02:49
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Hyper-Threading is supported on all of the Intel Core processors, but it only makes a difference in Core Single/Duo rather than Core 2 Single/Duo/Quad. As the Core 2-Series use a unified processor system, very similar to the new unified shader core that nvidia Geforce8 or ati Radeon X1K-Series provide.

If you have a Core (or Pentium-D) then it's activated as standard, but deactivated in the Core 2.

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TKF15H
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Posted: 30th Dec 2006 03:48
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Quote: "Windows XP 64 is a total joke right?
incompatibility madness with 32 bit drivers.
lack of dos based based games and applications"

Haven't had any trouble with it - all the hardware I have has 64 bit drivers, and DOS games never ran properly on the 32 bit version anyway (I'm thinking Red Alert and some others). I need DOSBox in either version.
The only reason I don't use it more often is that the 32 bit version got installed first and therefore has more stuff installed.

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Antidote
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Posted: 30th Dec 2006 05:29
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lol at Intel, AMD forever...

Yeah I know that was fanboyish... I just couldn't help myself


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Raven
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Posted: 30th Dec 2006 05:45
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I'd say that AMD might have a tough year ahead with Intel's Core processor range. They deliver what they need to at a reasonable price.

AMD are trying to hit back with the buy-out of ATI. So be interesting to see what the design of the new AMD processor will be like.

2007 certainly is beginning with a very big change to the PC market. I know from user points of view it'll just look like quicker PCs, but this year huge fundimental changes in desktop PCs and their OSs are going to be what shine.

Even under Windows with DirectX10, we're looking at some very big changes to how the hardware is used; plus the new hardware designs to run the technology. Quite exciting, if you're geeky enough to get amped about this sort of thing.

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Phaelax
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Posted: 30th Dec 2006 09:19
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Intel always held the lead over AMD for a long time. When the Athlons were released, there was a big change, namely Intel's first real competition. I think with their newest line of processors, my opinion is that Intel has what it needs to once again be the unquestioned leader.(for now)

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Antidote
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Posted: 30th Dec 2006 15:28
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I just like AMD because they're cheaper and you tend to get equal if not greater power out of them. My new computer has an AMD dual core 4600+ and it's fantastic.


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