Some S3 Video Cards Do Not Set Refresh Rate Properly

 Last reviewed: March 27, 1997
Article ID: Q155603
The information in this article applies to:
  • Microsoft Windows NT Server version 4.0
  • Microsoft Windows NT Workstation version 4.0

SUMMARY

Due to differences in BIOS mode tables, some S3 video cards do not set the proper refresh rate from the Display tool in Control Panel.

MORE INFORMATION

Windows NT determines the display mode options by obtaining display mode information from the video card BIOS mode tables. On occasion, because of differences in manufacturers and BIOS revisions, this results in a different refresh rate being used after reboot than the setting you selected.

On the Diamond Stealth 64 Video 2001 video card, for example, the following modes are not set correctly:

  • 800 x 600x 65536 Colors at 120hz (actually displayed at 100 Hz)
  • 800 x 600x True Color at 90hz (actually displayed at 75 Hz)
  • 800 x 600x True Color at 100hz (actually displayed at 75 Hz)
  • 800 x 600x True Color at 120hz (actually displayed at 75 Hz)

The Diamond video card cannot display the higher modes at the refresh rate displayed by the BIOS, so the BIOS automatically uses the highest possible refresh rate (in these cases, 100 or 75 Hz).

Additional query words: prodnt
Keywords : kbdisplay ntdriver nthw NTSrvWkst
Version : 4.0
Platform : WinNT

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Last reviewed: March 27, 1997
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