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  • CeBIT: LCD Samsung MPA or RTA ?
  • NVIDIA CUDA: preview
  • CeBIT: buy a real R2-D2
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     CeBIT: LCD Samsung MPA or RTA ?
      Posted on 21/03/2007 at 16:16 by Vincent
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    Samsung presented at CeBIT the first MPA monitor. The SyncMaster 245T is a monitor with a diagonal of 24 inches, using the PVA technology and scheduled to be released next summer. According to the company representative, MPA technology relies on stripes of LEDs that switch on and off to reproduce an artificial screening comparable to CRT monitors. We recently met a similar system in a BenQ monitor and this is the reason why this monitor was of great interest to us. Something, however, was wrong. Our questions started with the video showing this technology and the opposition between two names: MPA and RTA. We remind you that the monitor shows several bottles moving from the left side to the right side of the monitor and a function named "RTA" that is regularly activated and deactivated. OFF: not good. ON: good. That is pretty simple, isn't it?

    We asked the question to Samsung about the technology name. Is it MPA or RTA? The answer surprised us: they told us that this was a mistranslation of the Korean team…

    If you want to find the real answer, take a look at the video below:



    We clearly see that with "RTA OFF" the image is blurred and that with "RTA ON", it is much sharper. So, does that mean that MPA is actually working? Well actually, no. This is the starting point of our problems. If RTA really worked like they told us, we shouldn't have been able to capture the improvement with the camera. The screening doesn't reduce the afterglow due to liquid crystals but only has an impact on visual afterglow. The visual afterglow is the image kept by our eye because of the brightness. Another suspicious point: we took several photos with a shutter speed of 1/1000 s:


    Do you see something special? We don't. Here are to compare 16 pictures of the BenQ 241WZ side to side:



    Here, we clearly see the screening.

    So, what is your guess?
    We Googled the word RTA and it actually means Response Time Accelerator. This is the name given by Samsung to overdrive, a technology that accelerates the rotation of liquid crystals by increasing the voltage. In short, this isn't an artificial screening recreated by stripes of LEDs but only the overdrive activation/deactivation. In short: RTA OFF = 8 ms response time. RTA ON = 2 ms response time. This demonstration only confirms that with overdrive the image is actually better and that there was no MPA on the exhibition stand.



     NVIDIA CUDA: preview
      Posted on 21/03/2007 at 11:24 by Damien
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    Graphic processors or GPUs have evolved much in the past few years. Today, they are capable of calculating things other than pixels in video games, however, it's important to know how to use them efficiently for other tasks. If AMD has been the first to present a concrete solution to this problem, Nvidia is the first to make this solution available, the subject of this article.

    (we accept no liability for a severe headache following the reading of this article)

    > Nvidia CUDA : aperçu



     CeBIT: buy a real R2-D2
      Posted on 21/03/2007 at 10:33 by Vincent
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    Watch out, fans of Star Wars! Nikko has developed a really good looking R2D2. This isn't a gadget and it features many functions:





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