mincingleprechaun Posted September 30, 2009 Share Posted September 30, 2009 I've been searching and reading for weeks and weeks of the last few months to try to get Dual Link working. I've tried two 4870 cards, a sapphire and a XFX that I flashed with the Apple BIOS. I can reach 1920x1200 and dual monitor support with monitors of different resolutions but Dual Link remains illusive. Windows 7 has no problem reaching 2560x1600 with both video cards. I have used the "Simple Guide" method of getting my 4870 cards to work. I tried another method that involved modifying the com.apple.plist file but was unsuccessful with both cards. I am only running one video card at a time just to clarify that I'm not trying to trying anything with two cards at once. I am very interested to hear from anyone who has been able to do this with any video card or has tried. Thanks, Billy Link to comment https://www.insanelymac.com/forum/topic/189618-has-anyone-ever-reached-2560x1600-resolution/ Share on other sites More sharing options...
Nick14 Posted September 30, 2009 Share Posted September 30, 2009 Try switchresX it should work Link to comment https://www.insanelymac.com/forum/topic/189618-has-anyone-ever-reached-2560x1600-resolution/#findComment-1285397 Share on other sites More sharing options...
mincingleprechaun Posted September 30, 2009 Author Share Posted September 30, 2009 Try switchresX it should work After installing, restarting and entering new resolution information it made no changes at all. My guess is that the hacked drivers I'm using from the "simple guide" thread are not allowing it to work. Link to comment https://www.insanelymac.com/forum/topic/189618-has-anyone-ever-reached-2560x1600-resolution/#findComment-1285931 Share on other sites More sharing options...
mincingleprechaun Posted September 30, 2009 Author Share Posted September 30, 2009 Minor development. I am using two monitors of dissimilar size. This is not a normal operating mode for me but I had a spare sitting around and decided to connect it to see if it would have any use. I have been using the 30" monitor on one connector and connected the 19" to the other. Both are DVI. I decided to swap the connectors to see what would happen. When I rebooted I saw the medium blue screen after the soft gray screen with the spinning spokes. After a moment the 30" turned black (normal when it's connected to this port) but the 19" continued to the desktop although the background image changed. I opened SwitchresX and it said that Monitor #2 (the 30"dell) was at 2560x1600 (It's native resolution). When the cables are connected with the 30" on DVI 1 it will only boot to 1920x1200 and that's the highest available resolution. Now with the 30" on DVI 2 it will only show a black screen but it's a "live" black screen not in powersave mode. This is ultimately promising but still troubling. The monitor and video card are entering full resolution but the OS cannot display anything. What could be standing in the way? That's all for now. Link to comment https://www.insanelymac.com/forum/topic/189618-has-anyone-ever-reached-2560x1600-resolution/#findComment-1285966 Share on other sites More sharing options...
mincingleprechaun Posted October 1, 2009 Author Share Posted October 1, 2009 This looks good, right? Even better, right? {censored}! a black screen. I just don't get it. The system thinks it's running at 2560x1600 but the monitor is a black screen. I don't know where to start looking for a fix. Link to comment https://www.insanelymac.com/forum/topic/189618-has-anyone-ever-reached-2560x1600-resolution/#findComment-1286171 Share on other sites More sharing options...
feng'a Posted October 2, 2009 Share Posted October 2, 2009 I just plugged in a 3008WFP too. Same problem... however, if you unplug the 30" display, and plug it back in while everything's on, the display shows! even weirder eh? *shrug*... I'm running 10.5.7 with EFI boot on a X58 setup and a 4870. Link to comment https://www.insanelymac.com/forum/topic/189618-has-anyone-ever-reached-2560x1600-resolution/#findComment-1287583 Share on other sites More sharing options...
bm2 Posted October 3, 2009 Share Posted October 3, 2009 I have a 3008WFP running through an XFX 4890, on a ud5 board. I definitely had to play detective, on a number of issues. My 4890 has two dvi ports. Here's what I found: * Dual link only works out of port-2; port-1 is single link only, for now. * Chameleon/pc_efi10 needs the option "Graphics Mode"="2560x1600x32", or the display is black, after startup ...without that option set, recovery from this state requires either putting the display to sleep via control+shift+eject, or unplugging/re-plugging it in * With a dual-link screen active (port-2), plugging an additional screen into port-1 port invokes a kernel panic, under 10.6 * Evoenabler is required, to run in 64-bit mode -- aty_init and efi strings both fail here, in different ways ...Evoenabler is only configured for the 4890, by default. It can be modified for the 4870 as well, though Link to comment https://www.insanelymac.com/forum/topic/189618-has-anyone-ever-reached-2560x1600-resolution/#findComment-1288193 Share on other sites More sharing options...
kmare Posted October 3, 2009 Share Posted October 3, 2009 I have an 8800GT that I've had running 2560x1600 on a dell 3007 for the better part of 2 years. I have tested dual display, I believe at 1920x1440 and the 3007 with no problems. Dual display tested in Leopard, running single on Snow Leopard Link to comment https://www.insanelymac.com/forum/topic/189618-has-anyone-ever-reached-2560x1600-resolution/#findComment-1288430 Share on other sites More sharing options...
feng'a Posted October 3, 2009 Share Posted October 3, 2009 * Chameleon/pc_efi10 needs the option "Graphics Mode"="2560x1600x32", or the display is black, after startup I love you! That did it Wonderful... no more sleep/hot plugging required anymore. Link to comment https://www.insanelymac.com/forum/topic/189618-has-anyone-ever-reached-2560x1600-resolution/#findComment-1288470 Share on other sites More sharing options...
crashnburn_in Posted November 27, 2009 Share Posted November 27, 2009 Which PCIe / PCI Express / PCI X card (s) have driver support for 2560 x 1600 resolution on a Leopard or Snow Leopard? It could be any brand. NVidia, ATI or other. Preferably it can fit an Advanced Dock for T61. As I understand it, I will need a full-height, half-length PCIe video card. Please advise. Thanks. Link to comment https://www.insanelymac.com/forum/topic/189618-has-anyone-ever-reached-2560x1600-resolution/#findComment-1343832 Share on other sites More sharing options...
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