results intel OR840 dual rambus PC800-45

From: Rainer NAGEL (
Date: Thu Jul 25 2002 - 16:43:34 CDT

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    Dear Mr McCalpin,

    please find enclosed my results on an intel OR840 dual CPU dual rambus channel Mobo. I used the downloadable binary for winNT wstream.exe

    OS= MS w2k Server SP2,  single CPU kernel
    CPU= 1x intel PIII coppermine 933MHz/133/256k L2 Cache
    Main Memory= 2x 128MB Samsung PC800-45 RDRAM

    D:\bench\STREAM_John_McCalpin\win32>wstream 933 20
    This system uses 8 bytes per DOUBLE PRECISION word.
    Array size = 999936
    Total memory required = 24.9 MB.
    Each test is run 20 times, but only
    the *best* time for each is used.
    Your clock granularity/precision appears to be 1 microseconds.
    Each test below will take on the order of 23104 microseconds.
       (= 23104 clock ticks)
    Increase the size of the arrays if this shows that
    you are not getting at least 20 clock ticks per test.
    WARNING -- The above is only a rough guideline.
    For best results, please be sure you know the
    precision of your system timer.
    ------------------------------------------------------------! -
    Function      Rate (MB/s)   RMS time     Min time     Max time
    Copy:         522.3219       0.0307       0.0306       0.0307
    Scale:        523.1904       0.0307       0.0306       0.0310
    Add:          630.5020       0.0381       0.0381       0.0383
    Triad:        633.9901       0.0379       0.0379       0.0379

    I tested this system also with William Henning's
    MemTach V.093 where it performed quite poorer than an asus A7V133 1x Athlon 850, FSB100 using interleaved 2 DIMM's PC133-333 SDRAM.

    In your STREAM bench the asus A7V133 scores:

    Copy:  507 MB/s
    Scale: 408 MB/s
    Add:   355 MB/s
    Triad: 307 MB/s

    It's frustrating that the i840 chipset performs that worse, kind of a looser chipset against AMD 760MP(x) dual Athlon chipset which score around 1GB/s according to your website.

    These results seem ridiculus against a NEX SX4 (16'000MB/s) or SX5 (42'000 MB/s)


    Rainer Nagel
    Bruehlhaldenweg 6, CH-8956 Killwangen, Switzerland
    Tel. ++41-76-434.69.37
    Fax. ++41-56-402.07.74

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