i have the Radeon HD6970 with one monitor plugged in with a dvi to HDMI cable, on with a dvi to vga converter. and one with a mini display port. but it will not let me have the desktop extend to the third, and its just completely useless.|||(It supports up to 6, may want to at least look up the card prior to telling someone it only handles 2...)
First off make sure that you are using the Catalyst control panel for this, the standard Windows one will not be able to configure this. Also may want to go to make sure you have the most up to date driver installed usually the one on the CD is many versions old. The new driver link is below as well (Assuming you have Win 7 32bit).
For steps on doing it from there (Catalyst) go to the link below and go to page 21. For the section showing how many monitors are supported using what configuration go to page 12 where the below excerpt is taken. But you probably want to ensure that you are using one of the many different configuration methods they mention.
Multiple Displays
Your AMD Radeon HD 6950/6970 graphics card provides display functionality for up
to six displays using any combination of the following:
• Any number of Mini DisplayPort connections.
You can connect more than on display to a Mini DisplayPort connection using a
daisy chain configuration or a hub (multi-display support is made possible
through the DisplayPort v1.2 standard).
• Two connections between the single-link DVI, dual-link DVI, and HDMI
connections.
The following table shows some examples of multiple display configurations; (A)
indicates an active adapter is used and (P) indicates a passive adapter is used. Display
abbreviations are mDP = Mini DisplayPort, DVI = single-link DVI.|||I'm pretty sure you would need a video port for each monitor. If your video card has 2 ports, it can support 2 monitors. If you wanted to add a 3rd, you would need to install a 2nd video card. You can buy video cards with more than 2 ports, but they are expensive.
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