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  • Behardware.com at CeBIT
  • Intel Core : SSE in one cycle ?
  • Conroe 2.66 GHz vs Athlon 64 FX-60 at 2.8 GHz
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     Behardware.com at CeBIT
      Posted on 08/03/2006 at 15:10 by Marc
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    Tomorrow will start the gigantic European IT mass, the CeBIT. For the sixth consecutive year, we will go there to cover the event and get the latest innovations from the different actors of the market. See you tomorrow for the beginning of the news!

     Intel Core : SSE in one cycle ?
      Posted on 08/03/2006 at 14:16 by Marc
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    During IDF, Intel named the Conroe architecture that will be the successor to the Pentium 4 Netburst: Intel Core. Amongst the functionalities available introduced in the presentations and the press release is the Advanced Media Digital Media Boost.

    In the IDF press release, the Santa Clara giant says that this function makes possible to execute "many" SSE, SSE2 and SSE3 instructions in only one clock cycle. It would cut by half the time required to process them. In fact, it isn't the latency, the number of cycles required to process all micro instructions resulting from a x86 instruction, that has been improved but the processor transfer rate for these instructions.

    So for "many" SSE instructions it will be possible for the Intel Core to start one calculation per clock cycle. This is possible by increasing the number of processing units for example. The thing is that "many" is rather vague. For the Pentium M there are already some 30 instructions that have a latency of 1 cycle and a little less than 50 that have a throughput of 1 cycle.

    We have to point out that during Intel's presentation at IDF, it was even less clear. Some Medias understood that all SSE instructions would be processed in one cycle. It is of course strictly impossible because for example the DIVPD (Packed Double-Precision Floating-Point Divide) instruction requires no less than 62 cycles for the Pentium M and 70 cycles for the Pentium 4!

     Conroe 2.66 GHz vs Athlon 64 FX-60 at 2.8 GHz
      Posted on 08/03/2006 at 09:27 by Marc
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    During the IDF, Intel let the press make the comparison between one computer based on a Conroe 2.66 GHz, FSB1066, i975X and another based on Athlon 64 FX-60 overclocked at 2.8 GHz, RD480. The two computers included 1GB of memory, respectively DDR2-667 with timings of 4-4-4 and DDR400 with timings of 2-2-2, and two Radeon X1900 XT in CrossFire.

    Figures reported by AnandTech are quite high especially in the game domain which was so far AMD's ballpark. The Conroe is respectively 20%, 20%, 25% and 31% faster under Half Life 2, Fear, Quake 4 et UT2004. For encoding, AnandTech noticed the following performance gaps: 12% under WM9, 30% under DiVX 6.1 and 11% in MP3 under iTunes.

    These impressive results have to be taken with precautions. If AnandTech says that he hasn't found anything abnormal about these machines to influence the results of the tests, they have been put at disposal by Intel. The Conroe looks very promising and we can't wait to test the final version with our own benchmarks!

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