Originally Posted by HyperMatrix
I hope that works for you. Let me know if it does/doesn't and your experiences. And hey...if I got you 101hz on your Radeon card...feel free to rep me.
I mentioned PowerStrip before: http://www.overclock.net/t/1215866/reviewed-400-2560x1440-ips-no-ag-90hz-achieva-shimian-qh270-and-catleap-q270/1250#post_16639892
The problem is PowerStrip has no way of telling Windows or the video driver about the new refresh rate, so not everything works properly. For instance, moving windows around gets choppier because Aero runs at the wrong frame rate unless the multimedia timer resolution is set to a low value, which happens to be the case when Flash is running in a browser. Also, I found if anything tried to change the refresh rate, the video card would blank out and I had to reboot.
The pixel clock you set in PowerStrip might not be the actual value either. PowerStrip let me set up to 500 MHz, but I found the actual rate stopped changing at around 400 MHz. You can double-click the camera icon next to where it says "Custom" to calculate the actual refresh rate. You're probably running closer to 98 Hz. Also, I found PowerStrip can get confused if there are multiple monitors to the point where it won't even change the rate at all.
You don't have to do any of the steps you mentioned except adding 80-85 Hz first, then switching to it before running PowerStrip, otherwise the monitor might not display 100 Hz properly. The problem is PowerStrip adjusts the signal in real time, and the monitor can't seem to handle the signal changing from 60 Hz to 100 Hz, or maybe it's the video card, I don't know.
I was able to use the Refresh Rate Multitool to verify the refresh rate, but it also had the same problem of running at the wrong frame rate unless the multimedia timer resolution is set low enough. I was able to do that and verified that it really was running at 100 Hz using a camera.
Basically, the PowerStrip solution sort of works, but it's not an ideal solution. The ideal solution is to get AMD to remove the 330 MHz pixel clock limit in the driver when using dual-link DVI and the 288 MHz limit when using DisplayPort so people can use adapters.
Originally Posted by xdemi
HyperMatrix - you're a god amongst overclockers to FINALLY PROVE that you can OC RAMDAC (I believe subsequent posts of other forums found through google say that it's impossible).
It's not overclocking the RAMDAC. I still couldn't get past 400 MHz.