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How do I setup Eyefinity to support three monitors on a Radeon HD 5770 card? Currently I can setup only two at once in any combination.

Monitors are connected as DVI-DVI-HDMI.

Peter Mortensen
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Peter Stegnar
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2 Answers2

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On AMD Eyefinity Technology, there is this remark at the bottom:

Driver version 8.66 (Catalyst 9.10) or above is required to support ATI Eyefinity technology and to enable a third display you require one panel with a DisplayPort connector.

Do you have one screen connected with DisplayPort?

Peter Mortensen
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Snark
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    Arrgh. Thats the catch! Well I do not have DisplayPort monitor. But I am going to the local shop for DisplayPort to HDMI adapter. – Peter Stegnar Nov 06 '09 at 11:13
  • I have still problems: now I have DVI-DVI-DP and still drivers do not allow to have three monitors. What to do? – Peter Stegnar Nov 06 '09 at 12:31
  • Hehe you forgot about getting a new DP display. =) Dell UltraSharp series are quite ok. – Apache Jun 16 '10 at 06:35
  • @Peter First make sure that it's an **active** DP->HDMI adapter. If it is, then you may need to use both display ports instead of only one. [This page](http://support.amd.com/us/eyefinity/Pages/eyefinity-dongles.aspx) has more info on Eyefinity connectivity. – Ben Richards Sep 09 '11 at 17:28
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This cannot be solved with a passive adapter. Issue is in hardware and comes down to signaling on DVI, HDMI and DisplayPort.

If I recall correctly DVI and HDMI require an own clock signal per output. Because DisplayPort is a package protocol it requires only one clock signal per card. ATI Radeon HD 5000-series has two clocks for DVI/HDMI so it is possible only to use 2 of those devices, adapters do not change this fact.

There is however an active adater, that allows you to transform DisplayPort signal to DVI-signal. More information about the device here

So what you need is a native DisplayPort monitor or an active device that transforms DisplayPort signal to DVI/HDMI.

Ahe
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  • Your explanation is correct, but the initial comment is not. It *can* be solved with an adapter, but you need an active adapter that will use the clock signal from the DisplayPort. – Jeff Davis Apr 22 '10 at 15:22
  • I should have used word passive in first paragraph (now added). Active adapter is however mentioned in third paragraph. – Ahe Apr 27 '10 at 06:16
  • I've used a passive adapter on my ATI card and it worked fine with 3 displays, so perhaps they've made some updates to make this possible? – nhinkle Mar 30 '13 at 01:35
  • I'd add to this that if you want to get the third monitor working on the cheap you CAN use a Displayport-VGA passive adapter, and it'll work fine (as I've just found out). I'm assuming from Ahe's answer that trying to do a DVIx3 from a HD 5770 card will require an active adapter. – GordonBy Aug 16 '10 at 13:57