kerr Posted October 5, 2009 Share Posted October 5, 2009 installed ideneb 10.5.8 successfully, but i have only 76 Hz refresh rate for 1920x1200 resolution. How to get 60 Hz ? Used ATY_init in installation DVD, QE works and core image is hardware accelerated. The only problem is refresh rate, help me please. Link to comment https://www.insanelymac.com/forum/topic/190704-ati-4870-problem/ Share on other sites More sharing options...
Pronob Posted October 5, 2009 Share Posted October 5, 2009 I also have an Asus ATI 4870 and also installed iDeneb 10.5.8. The issue I was having was different. I was getting a blank screen but I could tell that the system was coming up as I could get the startup chime sound. I have 2 DVI outs. I had connected the first DVI to my Flat Panel display and the second DVI out was unplugged. The only way I could get the 4870 to detect my monitor was to plug the second DVI with a dvi2vga plug and viola I got my video card to recognize the monitor with 60Hz resolution. I discovered this by accident as I wanted to test it thru the VGA adapter. I dont know why that is, I think this is a common problem with 4870s and I know even some MacPro owners are having this issue (with SL as well). (signal termination probably??). Try plugging one of the ports with a DVI2VGA adapter to see if it solves ur problem. (BTW I used VNC to figure out why it wasnt detecting my monitor and defaulting to 60Hz - but ofcourse this is after I got it working accidentally) Link to comment https://www.insanelymac.com/forum/topic/190704-ati-4870-problem/#findComment-1290828 Share on other sites More sharing options...
kerr Posted October 6, 2009 Author Share Posted October 6, 2009 thanks Pronob, but this doesn't work. my card does not have 2 dvi outs. full specs are: Palit Radeon 4870 1 GB Sonic with 1 DVI, 1 D-Sub and 2 HDMI outs. In order to work i must connect it to the HDMI and to connect D-Sub in both card and monitor. Only in this scenario i have picture on my monitor. Link to comment https://www.insanelymac.com/forum/topic/190704-ati-4870-problem/#findComment-1291126 Share on other sites More sharing options...
vilpostus Posted October 6, 2009 Share Posted October 6, 2009 Try a paper-clip trick. http://www.insanelymac.com/forum/index.php?showtopic=80615 Link to comment https://www.insanelymac.com/forum/topic/190704-ati-4870-problem/#findComment-1291428 Share on other sites More sharing options...
kerr Posted October 6, 2009 Author Share Posted October 6, 2009 No, this doesn't work either. I'm begining to wonder if there is a fix at all... Link to comment https://www.insanelymac.com/forum/topic/190704-ati-4870-problem/#findComment-1291927 Share on other sites More sharing options...
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