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The refresh rate my video card is using is too low, or it is supposed to support a particular refresh rate but it is using a lower rate instead
Explanation: The video card's refresh rate is too low. You may believe that the video card you are using should be capable of running at a higher refresh rate than the system is currently using. You are unable to set the video card to run at a refresh rate that it is supposed to support.
Diagnosis: There are two general of the causes of this problem. The first is the possibility that the card may not be exactly what you think it is, because many manufacturers sell different versions of their cards and they can have different capabilities. For example, Matrox sells both "retail" and "OEM" versions of their popular Millennium card. The retail version uses a faster RAMDAC and is therefore capable of displays at higher refresh rates than the OEM version. More on retail vs. OEM can be found here. The second possibility is misconfiguration. If the system is not set up properly then the refresh rates may be selected incorrectly. In particular, many people don't realize that under Windows 95, the refresh rate setting is impacted by the selection of monitor type. In many PCs Windows 95 is set up with a generic monitor type selected (because it doesn't appear to matter much which monitor type is chosen, at first glance). This tells the video driver (incorrectly) that the monitor is overly limited in the refresh rates it can handle.