Im running a Radeon 5850 and have 2 23" LCD's hooked up via DVI, works flawlessly. I am trying to add my 32" LCD via HDMI to watch movies and play games but for some reason its telling me its not allowed, any ideas here?
I know for eyefinity one of the monitors has to be using the Displayport. Many people say that you need an active DP to DVI cable which can run you $100. However, in this thread they found out that you can use a DP to VGA adapter which are only about $20.
Read the posts...the passive DP to DVI do not work well with the 5800 series. I was going down that same path until I read the comments. A gotcha with Eyefinity is all 3 monitors need to be the same resolution or else it will use the lowest resolution on all monitors.
The HDMI port is shared with one of the DVI ports which is why you cannot use both DVI's and HDMI.
You need that active DP adapter my friend. And they are not the same. Some people complain about the Apple active adapter, but it works for others....
You can run your desktop in Eyefinity mode and it is a little different than extended. It wont stretch your video across all screens. It takes the same pixels as it did before. I have never tried extending my desktop across 3 monitors so I cannot vouch whether that works.