My eyes have been bothering me, so I checked the refresh rate on my monitors. I have a 4-head video card. The native resolution for all monitors is 1280X1024, and I have them all at that setting. They're supposed to support a refresh rate of 75 Hz, but my only option was 60 Hz. The only way I could change to 75 Hz was to change from true color (32 bit) to high color (16 bit). Here's what the manual says: The higher the refresh rate is, the better the resolution becomes. However, this can be limited by the capacity of the system. My video card only has 32 MB of memory total (8 MB per monitor). Is this the problem? Is that what they mean by the 'capacity of the system'? Also, 3 of the monitors are Samsungs, which recommend a 75 Hz refresh rate. The 4th is an NEC, and the recommended refresh rate is 60 Hz. Am I better off using 75 Hz anyway, since the other monitors are at 75 Hz?