ATI Eyefinity with 3 monitors – Unable to save display settings

Today I bought ATI 5750 Eyefinity edition. I wanted to enable 3 monitors with one video card as advertised. My setup:

  • LG 37″ LCD TV Full HD – using hdmi – hdmi or DVI – hdmi cables
  • Samsung 22″ LCD 1680×1050 – using DVI – DVI cable
  • Old Samsung 19″ LCD – using DVI – VGA (D-sub) – VGA cable

Under Screen resolution (Windows 7 Ultimate), trying to add 3rd display (extend desktop to this display), it always shows the following error window:
[Change Settings]
Unable to save display settings.

I can enable any 2 monitors, but when I try to add third, it shows the same error. Some people have reported, that they have successfully enabled third display (for example Jeff Atwood from codinghorror). The thing is, that I have passive DisplayPort to DVI cable, but Jeff has Active DisplayPort to DVI, that cost $110. That’s insane! I can buy multiple ATI 3450 cards for that price and build at least 3+ monitor setup.

Now I am going to add one of my old ATI cards to existing setup, to fix this broken Eyefinity thing.

P.S. Also, I have strange issue with HDMI – HDMI cable when connected to LG LCD TV. With this cable I am unable to get satisfactory image (always black bars / borders and blurry fonts), so I am using DVI – HDMI cable. Some folks in ATI forums also have reported issues with HDMI – HDMI cables.

Update (thanks to Bill, July 12, 2010).
A maximum of 2 legacy monitors (VGA, DVI or HDMI) can be enabled simultaneously, provided that each monitor is connected either directly or via a “passive” DisplayPort adapter/dongle. “Passive” adapters/dongles will NOT support more than 2 legacy monitors.

ATI / AMD support site