While installing Windows 7 64-bit, I ran into the 59Hz issue, where the refresh rate for the monitor can only be set to 59Hz; whenever I set it to 60Hz (which was available) it would revert to 59Hz. After some googling, I found two interesting threads: http://forums.guru3d.com/showthread.php?t=301860 http://forums.techpowerup.com/showthread.php?t=100814&page=2 The guru3d post explains it's not really a bug; it's about a long-standing issue of 59.94Hz vs 60Hz and whether Windows rounds up or down; in Win7, 59Hz is actually 59.94Hz (read the whole original post, too long to quote here). However, some improperly coded games are affected by the issue. Those games include, and I quote the guru3d post, BF2 (and any sequel, or game based off the BF2 engine), WiC (works at 59hz according to pSXAuthor) and CoH. In the techpowerup thread, post #20 further explains the issue, and suggests the problem extends to all DX10 games (but I have no way of knowing if it actually does). Other comments in the threads showed that whether or not the 59Hz issue causes problems is highly variable: some displays have problems with this issue and some don't; some displays can have a problem with an HDMI connection but have no problem with a DVI or VGA connection; some dual display setups can have problems with this issue and some don't. Post #33 of the techreport thread described a fix for nVidia cards, which I have modified slightly to reflect what I had to do: - Go to Nvidia Control Panel - Go to Add resolution - Create Custom Resolution - Click on Timing - Click on Manual - Set refresh rate to 60.001 Hz - Press Test - Restart Windows This worked for my nVidia card running the 191.07 Win7 64bit driver, but I did need to restart Windows for the change to take effect; after applying this fix but before I restarted, my NEC 20WMGX2's OSD reported 59.7Hz; after the restart, it reported 60Hz. My other NEC 20WMGX2 on my Mac Mini reports 59.7Hz, even though it is set to 60Hz in the Displays System Preference. Post #2 of the techpowerup thread quotes another techpowerup thread with a fix for ATi cards: I don't have an ATi card so I can't comment further on the ATi fix.