MEMORY BUS SPEED TEST RESULTS

See BUSSPEED.TXT for a description of the tests and results.

1. FROM W32BUSRD.BAT, DOSBUSRD.BAT and OS2BUSRD.CMD


BUSSPEED Standard Parameters
Loading 4 bytes with 32 byte increments using MOV

                                         At 4 bytes/xfer At 32 b/xfer
                                                            16 486
                        L1    L2   RAM    L1    L2   RAM    L2   RAM
Vers    CPU      MHz   MIPS  MIPS  MIPS  MB/S  MB/S  MB/S  MB/S  MB/S

DOS   80486DX2   66    29.3   2.8   2.0   117    11     8    45    32
DOS   Pentium    100   90.7   6.6   3.1   363    26    12   211    99
OS2   Pent MMX   200  188.2  13.3   7.2   753    53    29   426   230
W95   Pent MMX   200  186.4  13.1   7.2   746    52    29   419   230
DOS   Pent MMX   200  188.2  13.3   7.3   753    53    29   426   234
DOS   Pent Pro   200  191.4  33.4   8.2   766   134    33  1069   262
 NT   Pent Pro   200  191.1  33.3   8.1   764   133    32  1066   259
                                                          

BUSSPEED Loading, Increment 4, 1 Register
Loading every 4 byte word using MOV

                                          At 4 bytes/xfer
                        L1    L2   RAM    L1    L2   RAM
Vers    CPU      MHz   MIPS  MIPS  MIPS  MB/S  MB/S  MB/S

DOS   80486DX2   66    35.1   8.2   6.4   140    33    26
DOS   Pentium    100   97.2  31.1  18.7   389   124    75
OS2   Pent MMX   200  194.7  58.6  35.0   779   234   140
W95   Pent MMX   200  192.4  58.6  34.7   770   234   139
DOS   Pent MMX   200  196.3  59.2  35.4   785   237   142
DOS   Pent Pro   200  194.7 114.0  57.5   779   456   230
 NT   Pent Pro   200  196.2 113.5  58.2   785   454   233


BUSSPEED Loading, Increment 4, 2 Registers
Loading every 4 byte word using MOV

                                          At 4 bytes/xfer
                        L1    L2   RAM    L1    L2   RAM
Vers    CPU      MHz   MIPS  MIPS  MIPS  MB/S  MB/S  MB/S

DOS   80486DX2   66    34.7   8.0   6.3   139    32    25
DOS   Pentium    100  180.3  34.7  20.1   721   139    80
OS2   Pent MMX   200  368.9  59.0  35.2  1476   236   141
W95   Pent MMX   200  365.7  58.9  34.7  1463   236   139
DOS   Pent MMX   200  369.9  59.2  35.4  1480   237   142
DOS   Pent Pro   200  193.9 113.9  56.7   776   456   227
 NT   Pent Pro   200  194.5 113.8  58.2   778   455   233


BUSSPEED Check Data 1, Increments 4, 1 Register
Loading every 4 byte word using AND and XOR

                                          At 4 bytes/xfer
                        L1    L2   RAM    L1    L2   RAM
Vers    CPU      MHz   MIPS  MIPS  MIPS  MB/S  MB/S  MB/S

DOS   80486DX2   66    31.7   7.7   6.1   127    31    24
DOS   Pentium    100   49.6  24.1  16.1   198    96    64
OS2   Pent MMX   200   98.9  48.5  31.2   396   194   125
W95   Pent MMX   200   97.3  44.5  30.8   389   178   123
DOS   Pent MMX   200   98.2  48.0  31.4   393   192   126
DOS   Pent Pro   200  188.1 113.6  61.1   752   454   244
 NT   Pent Pro   200  189.4 114.1  60.7   758   456   243


BUSSPEED Check Data 1, Increment 4, 2 Registers
Loading every 4 byte word using AND and XOR

                                          At 4 bytes/xfer
                        L1    L2   RAM    L1    L2   RAM
Vers    CPU      MHz   MIPS  MIPS  MIPS  MB/S  MB/S  MB/S

DOS   80486DX2   66    30.0   7.7   6.1   120    31    24
DOS   Pentium    100   94.9  29.3  18.4   380   117    74
OS2   Pent MMX   200  190.2  59.0  35.2   761   236   141
W95   Pent MMX   200  190.3  58.7  34.7   761   235   139
DOS   Pent MMX   200  190.3  57.9  35.2   761   232   141
DOS   Pent Pro   200  190.3 113.8  61.8   761   455   247
 NT   Pent Pro   200  190.0 113.8  60.5   760   455   242


BUSSPEED Check Data 2, Increment 4, 1 Register
Loading every 4 byte word using AND

                                          At 4 bytes/xfer
                        L1    L2   RAM    L1    L2   RAM
Vers    CPU      MHz   MIPS  MIPS  MIPS  MB/S  MB/S  MB/S

DOS   80486DX2   66    31.3   7.8   6.1   125    31    24
DOS   Pentium    100   49.1  24.0  16.3   196    96    65
OS2   Pent MMX   200   98.9  48.5  31.0   396   194   124
W95   Pent MMX   200   97.3  45.0  30.7   389   180   123
DOS   Pent MMX   200   98.3  48.2  31.2   393   193   125
DOS   Pent Pro   200  190.3 113.1  61.1   761   452   244
 NT   Pent Pro   200  190.0 114.2  60.7   760   457   243


BUSSPEED Check Data 2, Increment 4, 2 Registers
Loading every 4 byte word using AND

                                          At 4 bytes/xfer
                        L1    L2   RAM    L1    L2   RAM
Vers    CPU      MHz   MIPS  MIPS  MIPS  MB/S  MB/S  MB/S

DOS   80486DX2   66    30.3   7.7   6.2   121    31    25
DOS   Pentium    100   95.0  29.6  18.5   380   118    74
OS2   Pent MMX   200  191.3  58.9  35.2   765   236   141
W95   Pent MMX   200  190.0  58.4  34.7   760   234   139
DOS   Pent MMX   200  190.5  58.5  35.2   762   234   141
DOS   Pent Pro   200  193.0 112.8  61.1   772   451   244
 NT   Pent Pro   200  192.6 113.7  60.7   770   455   243


2.  FROM DOSBAT2.BAT

32 byte address increments, offset 0 to 32


DOS Version
Data Address 0055cd20


                PPRO    MMX    Pentium 486DX2
               200 MHz 200MHz  100MHz  66 MHz
                EDO     SDRAM   FPM

  KB  Offset    MIPS    MIPS    MIPS    MIPS

    4       0   193.4   189.5    90.5    30.1
    4       1   191.0    49.1    24.2    11.4
    4       2   195.3    49.5    24.2    11.4
    4       3   191.0    48.8    24.2    11.4
    4       4   193.0   189.5    91.0    30.5
    4       5    39.5    49.1    24.3    11.5
    4       6    39.5    49.5    24.3    11.3
    4       7    39.5    48.8    24.3    11.3
    4       8   193.4   188.2    90.4    30.1
    4       9   192.0    49.6    24.3    11.4
    4      10   190.3    49.5    24.3    11.3
    4      11   192.8    49.2    24.2    11.5
    4      12   191.0   189.5    90.7    30.4
    4      13    39.5    48.9    24.2    11.4
    4      14    39.5    49.1    24.3    11.5
    4      15    39.5    48.9    24.5    11.3
    4      16   191.0   189.1    91.5    30.1
    4      17   193.0    49.2    24.2    11.3
    4      18   191.0    49.2    24.3    11.5
    4      19   193.0    49.1    24.3    11.3
    4      20   191.0   187.7    91.7    30.5
    4      21    39.5    49.2    24.5    11.3
    4      22    39.5    49.5    24.0    11.4
    4      23    39.5    49.5    24.3    11.3
    4      24   191.0   188.2    91.2    30.4
    4      25   193.4    49.6    24.3    11.3
    4      26   191.4    49.5    24.3    11.3
    4      27   193.4    48.9    24.5    11.3
    4      28   192.8   189.1    90.9    30.5
    4      29    21.9    49.7    24.2    11.3
    4      30    22.2    49.5    24.3    11.3
    4      31    22.0    48.9    24.2    11.3
   64       0    33.2    13.3     6.6     2.7
   64       1    33.5    11.0     4.7     2.0
   64       2    33.0    11.0     4.7     2.0
   64       3    33.0    11.0     4.7     2.0
   64       4    33.0    13.2     6.6     2.7
   64       5    20.7    11.1     4.7     2.0
   64       6    20.8    11.1     4.7     2.0
   64       7    20.9    11.1     4.7     2.0
   64       8    32.9    13.3     6.6     2.8
   64       9    33.1    11.0     4.7     2.0
   64      10    33.1    11.0     4.7     2.0
   64      11    33.2    11.0     4.7     2.0
   64      12    32.9    13.2     6.6     2.8
   64      13    19.5     7.3     4.7     1.4
   64      14    19.4     7.4     4.7     1.4
   64      15    19.4     7.3     4.7     1.4
   64      16    33.2    13.3     6.6     2.8
   64      17    33.3    11.0     4.7     2.0
   64      18    33.3    11.0     4.7     2.0
   64      19    33.0    11.0     4.7     2.0
   64      20    33.0    13.3     6.6     2.8
   64      21    20.9    11.0     4.7     2.0
   64      22    20.8    11.1     4.7     2.0
   64      23    21.0    11.0     4.7     2.0
   64      24    33.5    13.3     6.6     2.8
   64      25    33.4    11.0     4.7     2.0
   64      26    33.5    11.0     4.7     2.0
   64      27    33.0    11.0     4.7     2.0
   64      28    33.0    13.2     6.6     2.8
   64      29    15.7    13.1     6.6     1.4
   64      30    15.6    13.1     6.5     1.4
   64      31    15.7    13.1     6.6     1.4
 2048       0     8.1     7.2     3.1     2.0
 2048       1     8.1     6.6     2.6     1.6
 2048       2     8.2     6.5     2.6     1.6
 2048       3     8.2     6.6     2.6     1.6
 2048       4     8.2     7.3     3.1     2.0
 2048       5     5.6     6.5     2.6     1.6
 2048       6     5.6     6.5     2.6     1.6
 2048       7     5.7     6.5     2.6     1.6
 2048       8     8.2     7.3     3.1     2.0
 2048       9     8.2     6.6     2.6     1.6
 2048      10     8.2     6.5     2.6     1.6
 2048      11     8.2     6.6     2.6     1.6
 2048      12     8.2     7.3     3.1     2.0
 2048      13     4.9     4.4     2.6     1.0
 2048      14     4.9     4.4     2.6     1.0
 2048      15     4.9     4.4     2.6     1.0
 2048      16     8.1     7.3     3.1     2.0
 2048      17     8.2     6.6     2.6     1.6
 2048      18     8.2     6.6     2.6     1.6
 2048      19     8.2     6.5     2.6     1.6
 2048      20     8.1     7.3     3.1     2.0
 2048      21     5.7     6.6     2.6     1.6
 2048      22     5.6     6.6     2.6     1.6
 2048      23     5.6     6.5     2.6     1.6
 2048      24     8.2     7.2     3.1     2.0
 2048      25     8.2     6.6     2.6     1.6
 2048      26     8.2     6.5     2.6     1.6
 2048      27     8.2     6.5     2.6     1.6
 2048      28     8.1     7.3     3.1     2.0
 2048      29     4.4     7.3     3.1     1.0
 2048      30     4.4     7.3     3.1     1.0
 2048      31     4.5     7.3     3.1     1.0


3.  FROM DOSBAT3.BAT AND DOSBAT4.BAT

            1 Register                  2 Registers

 CPU        PPRO    MMX   Pent   486DX2 PPRO    MMX   Pent  486DX2
 MHz         200    200    100     66    200    200    100    66
             EDO   SDRAM   FPM           EDO   SDRAM   FPM

 KB Offse   MIPS   MIPS   MIPS   MIPS   MIPS   MIPS   MIPS   MIPS

   4    0  196.3  196.3   98.1   35.0  193.9  370.2  179.9   34.7
   4    1   65.8   49.6   24.8   11.8   65.6   65.8   32.8   11.8
   4    2   65.6   49.4   24.9   11.8   65.6   65.6   33.0   11.8
   4    3   65.8   49.6   24.7   11.8   66.4   66.3   32.7   11.8
   4    4  194.7  194.7   97.0   35.0  194.7  370.2  179.1   34.7
   4    5   65.6   49.6   24.8   11.8   65.6   65.6   33.1   11.8
   4    6   65.6   49.6   24.9   11.8   66.1   65.6   32.7   11.8
   4    7   65.6   49.2   24.8   11.8   65.6   65.6   32.7   11.8
   4    8  196.6  194.7   97.3   35.0  193.9  370.2  180.9   34.7
   4    9   65.6   49.6   24.7   11.8   65.6   65.6   32.8   11.8
   4   10   65.6   49.6   24.9   11.8   65.6   65.6   33.0   11.8
   4   11   65.8   49.6   24.9   11.8   65.6   65.8   32.7   11.8
   4   12  198.3  194.7   97.0   34.7  194.2  369.4  179.9   34.7
   4   13   65.6   49.5   24.7   11.8   65.6   65.6   33.1   11.8
   4   14   65.6   49.6   24.8   11.8   65.4   65.8   33.0   11.8
   4   15   65.6   49.2   24.7   11.8   65.0   65.4   32.7   11.9
   4   16  196.6  194.7   97.2   35.1  194.3  370.2  178.1   34.7
  64    0  113.9   59.1   31.1    8.2  113.8   60.1   34.7    8.0
  64    1   64.1   33.2   17.0    6.1   64.3   38.1   20.4    6.0
  64    2   64.3   33.2   17.1    6.1   64.3   37.9   20.4    6.0
  64    3   64.3   33.2   17.1    6.1   64.3   37.7   20.4    6.0
  64    4  113.9   59.2   31.4    8.4  114.3   65.4   35.4    7.9
  64    5   64.3   33.1   17.1    5.7   63.7   38.1   19.4    5.8
  64    6   64.1   33.1   17.1    5.7   63.7   37.7   19.6    5.8
  64    7   64.0   33.2   17.1    5.7   64.1   37.9   19.6    5.8
  64    8  113.9   59.0   31.4    7.8  113.8   59.1   34.7    8.0
  64    9   64.9   33.2   17.2    6.1   64.3   37.7   20.2    6.0
  64   10   64.9   33.2   17.1    6.1   64.2   37.9   20.4    6.0
  64   11   64.9   33.6   17.0    6.1   64.9   38.1   20.2    6.0
  64   12  114.2   59.1   31.4    8.0  114.0   65.7   35.0    7.9
  64   13   64.1   33.2   17.1    5.8   63.5   38.1   19.6    5.8
  64   14   64.3   33.2   17.1    5.8   64.0   37.9   19.6    5.8
  64   15   63.7   33.2   17.1    5.8   63.7   38.1   19.6    5.8
  64   16  113.8   59.2   31.4    8.1  114.2   59.0   35.1    8.0
2048    0   56.8   35.2   18.7    6.4   56.8   35.3   20.1    6.2
2048    1   47.7   24.1   12.5    4.9   47.7   26.5   14.2    4.9
2048    2   47.8   24.1   12.5    4.9   47.7   26.4   14.3    4.9
2048    3   47.7   24.1   12.5    5.0   47.7   26.4   14.2    4.9
2048    4   58.8   35.3   18.7    6.4   59.5   35.3   20.0    6.2
2048    5   47.7   24.1   12.4    4.8   48.3   26.5   13.8    4.9
2048    6   47.7   24.1   12.4    4.8   48.2   26.5   13.7    4.9
2048    7   47.7   24.0   12.4    4.8   47.7   26.5   13.8    4.9
2048    8   58.8   35.2   18.7    6.1   58.9   35.2   19.9    6.3
2048    9   47.8   24.1   12.5    5.0   47.8   26.5   13.9    4.9
2048   10   47.2   24.0   12.5    5.0   47.2   26.5   14.1    4.9
2048   11   47.1   24.4   12.5    5.0   47.8   26.5   14.0    4.9
2048   12   58.8   35.3   18.8    6.3   58.2   35.3   19.9    6.2
2048   13   42.6   24.2   12.5    4.9   42.7   26.5   13.7    4.9
2048   14   42.6   24.1   12.4    4.8   42.6   26.6   13.8    4.9
2048   15   42.6   23.9   12.5    4.9   42.6   26.7   13.8    4.9
2048   16   58.8   35.3   18.7    6.4   58.8   35.4   19.8    6.2


Roy Longbottom
14 November 1997
