Hey everyone,
I installed Windows XP Professional 32-bit through Bootcamp on my imac computer and I am trying to get 120 Hz on the HP P1230 external monitor. On the OS X side, I am able to get 120 Hz just fine. (The HP P1230 is hooked up through an Apple Mini DisplayPort to VGA Adapter.)
First, I started up Windows XP with the external monitor and I did not see the monitor listed in Display settings. (It should be plug-and-play.) After some research, I discovered that the Nvidia control panel listed the HP P1230 in Nvidia nView. The highest hertz option available though was only 85 Hz. I then remembered that I needed to install the monitor drivers from HP, so I did that and then the monitor showed up in Display settings. The thing is, 85 Hz was the highest option there as well.
I noticed that if I changed the monitor settings in Display settings versus Nvidia nView, the monitor did not look as good. I'm not sure why that would be.
Again, I am able to run the monitor at 120 Hz on the OS X side, so am I missing a step?
Also, the check box in Display settings to hide modes that the monitor cannot display is greyed out and I am not sure why.
Here are some things I have found that might be helpful:
My HP P1230 is hooked up through an Apple Mini DisplayPort to VGA Adapter. Could that be the issue?
There seems to be a Stereo Mode that allows for 120 Hz:
https://forums.geforce.com/default/topic/484760/crt-stereo-mode-120hz-how-to-i-enable-this-display-mode-/
http://www8.hp.com/h20195/v2/GetDocument.aspx?docname=c04285942
I'm not sure where Stereo Mode even is. Also, the resolutions listed for that mode are higher than what I need on the OS X side for 120 Hz (1024 x 768).
http://h30499.www3.hp.com/t5/Monitors/HP-monitor-wont-let-me-use-maximum-refresh-rate-it-supports/td-p/2344557#.U8XjBKiUH_y
Thanks for the help everyone!