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Some questions concerning Eyefinity with 5850 Crossfire

post #1 of 10
Thread Starter 
Hello!
I will be making the voyage to an Eyefinity setup shortly, as I just purchased 3 Dell ST2220L monitors and a single Active Mini Displayport to DVI adapter. I will be connecting these to a PC running two XFX 5850's in Crossfire.

I just had a few quick questions concerning this. If anyone can help me out it'll be greatly appreciated!

1) I know that if you're running more than 2 monitors, the third needs to have a mini displayport adapter. Do I need an additional mini displayport adapter for every monitor I use past that? (or in other words -- if I decide to add a 4th monitor, can it connect with DVI or will it need an additional mini displayport like the 3rd monitor?)

2) Since my setup is crossfire, where do I plug everything in? Do I plug all three monitors into the primary card, or can I plug them into the secondary card too? If anything is plugged into the secondary card, does it disable CrossfireX for games and such? If I wanted to keep CrossfireX would I need to have everything plugged into the main card, 2 of them via DVI and the third via mini displayport?

3) If I decide I want to play games but only with, say, the center monitor, will I have to manually disable the other monitors every time before launching the game, or is there a way to set it up in CCC where it'll atuomatically disable them when I launch the game?

Thanks for any help!
post #2 of 10

1. If below is your cards, it can only drive 3 monitors simultaneously because one of the DVI port and HDMI share TMDS and clock signal. Only the third monitor will need active adapter (see below link). The monitor setup; 1. DVI -DVI, 2. DVI-DVI, 3. DVI-DP Single Link Active Adapter.

 

2. Eyefinity will only work with all monitors plug to one card (primary) or it will also break crossfire.

 

3. You can simply toggle Eyefinity to Extended Desktop by pressing Windows Button + P.

 

 

 

14-150-442-Z01?$S300W$

 

 

Accell B087B-005B UltraAV DisplayPort to DVI-D Single-Link Active

 

41ggXhsz1FL._SL500_AA300_.jpg

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post #3 of 10
Eyefinity will work with 1 card as long as it has enough display ports, the first 2 monitors can be DVI or HDMI, but anything after that 3 4 5 or 6 will need display port, or active display port adapters. In crossfire mode, the 2nd card is basically used as a slave card, th I/O is useless... you can use the ports in eyefinity without crossfire, but in CFx you cannot use the second card. and if you want to game on 1 monitor for whatever reason, go into the games options menu and select the native resolution of the center screen
    
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post #4 of 10
Thread Starter 
Quote:
Originally Posted by Ken1649 View Post

1. If below is your cards, it can only drive 3 monitors simultaneously because one of the DVI port and HDMI share TMDS and clock signal. Only the third monitor will need active adapter (see below link). The monitor setup; 1. DVI -DVI, 2. DVI-DVI, 3. DVI-DP Single Link Active Adapter.

2. Eyefinity will only work with all monitors plug to one card (primary) or it will also break crossfire.

3. You can simply toggle Eyefinity to Extended Desktop by pressing Windows Button + P.

Hi Ken,
Great, thank you for the response. That is indeed the same model card I have, as well as the same active adapter I purchased. So I should be able to run all 3 monitors off of one card, and still keep the CrossfireX enabled? If I were to get a 4th monitor, could I connect it to the secondary GPU, or would that disable the CrossfireX scaling?

Thanks again!


EDIT: Sorry Pentium4, you must have posted while I was typing. Thanks for the help!


EDIT2: I pose another question, then -- lets say I have 3 monitors successfully hooked up to the main GPU - two via DVI, and one via mini displayport. Then I get a fourth monitor, and add it to the slave GPU, connected again via mini displayport.

If I understand correctly, I could not run CrossfireX with all 4 displays since the 4th monitor is connected to the slave card. But would I still be able to get CrossfireX to run on the main 3 monitors (connected to the main GPU), and just leave the 4th out, or would I have to literally unplug the 4th monitor to get CFX to work with the main 3?

The reason I ask this is I will have 3 monitors for eyefinity, and then I wanted to mount my current monitor above the middle screen of the eyefinity setup (so as a 4th monitor). I would like to have Crossfire X in the 3 main screens, but the 4th one would just be used for watching videos and such. Gaming would be restricted to the main 3.

Sorry if this is confusing. Please let me know if you need any more clarification. smile.gif Thanks!
Edited by Fr0st - 2/1/12 at 9:19am
post #5 of 10
Quote:
Originally Posted by Fr0st View Post


Hi Ken,
Great, thank you for the response. That is indeed the same model card I have, as well as the same active adapter I purchased. So I should be able to run all 3 monitors off of one card, and still keep the CrossfireX enabled? If I were to get a 4th monitor, could I connect it to the secondary GPU, or would that disable the CrossfireX scaling?
Thanks again!
EDIT: Sorry Pentium4, you must have posted while I was typing. Thanks for the help!


I am afraid the fourth monitor will not be possible though the card has 4 ports i.e., 2 DVI, 1 HDMI and 1 DisplayPort.

 

Can only use 3 ports as explained above. the DVI-D Single Link and HDMI share one TMDS and clock signal. So either DVI-D Single Link or HDMI, not both.

 

Also, you could not connect the fourth to the second 5850 at the same time to maintain Crossfire.

 

Edit:

 

I understand, but there's no way around it for the fourth monitor with your current card and having crossfire. You can have the fourth to the second 5850 but no crossfire scaling and if you don't mind with manual plug and unplug the fourth when you need crossfire.

 

 

 


Edited by Ken1649 - 2/1/12 at 9:25am
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post #6 of 10
Thread Starter 
Quote:
Originally Posted by Ken1649 View Post



I am afraid the fourth monitor will not be possible though the card has 4 ports i.e., 2 DVI, 1 HDMI and 1 DisplayPort.

Can only use 3 ports as explained above. the DVI-D Single Link and HDMI share one TMDS and clock signal. So either DVI-D Single Link or HDMI, not both.

Also, you could not connect the fourth to the second 5850 at the same time to maintain Crossfire.



Hi Ken,
Ahh, that's what I expected but feared. Looks like I'll need to get one of those GPU's with a lot of mini displayport's if I want to run the setup I am thinking of.

Thanks so much to you and the other posters for the help! That's all I needed to know. smile.gif

Cheers
post #7 of 10
Actually since DVI and HDMI run on the same signal, there can only be 2 of em running at once... IE DVI DVI or DVI HDMI if you want 4 monitors you need DVI / DVI or HDMI / Display port / Display port such as ont the Radeon HD 6000 series of cards take a look at the 5870 Eyefinity 6 edition, im not sure about the VRAM being enough... but it should do you good with 6 mini display ports
    
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post #8 of 10
Thread Starter 
Quote:
Originally Posted by Pentium4 531 overclocker View Post

Actually since DVI and HDMI run on the same signal, there can only be 2 of em running at once... IE DVI DVI or DVI HDMI if you want 4 monitors you need DVI / DVI or HDMI / Display port / Display port such as ont the Radeon HD 6000 series of cards take a look at the 5870 Eyefinity 6 edition, im not sure about the VRAM being enough... but it should do you good with 6 mini display ports

Hi Pentium4,
So you're saving that if I have 3 monitors, 2 of them can't be connected to the 2 DVI slots (on the main card)? Or are you saying that If I use the 2 DVI ports for 2 screens, then I cannot use the HDMI port? (Sorry if I'm coming off as slow, didn't get any sleep last night haha)

My intended setup is as follows: 3 screens, 2 of them connected to the main GPU via 2 DVI ports, the 3rd connected to the mini displayport via a DVI-to-displayport adapter.

Thanks for clearing up the questions with the 4th monitor! It's appreciated.

Cheers!
post #9 of 10
the first card may be able to connect DVI, the second can be connected via HDMI or DVI, but the third HAS to be Display port or the display port adapter... you cant go DVI - DVI HDMI, Native on your video card

so if you want 3 monitors its DVI - DVI, and Display port adapter.. if you want 4 monitors its DVI- DVI - display port adapter - Display port adapter, im probably going to get an active display adapter myself... but i mean its like 35 bucks for the adapter >.< they just taking advantage of the people who dont want to go spend 300 bucks on a monitor with display port
    
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post #10 of 10
Thread Starter 
Quote:
Originally Posted by Pentium4 531 overclocker View Post

the first card may be able to connect DVI, the second can be connected via HDMI or DVI, but the third HAS to be Display port or the display port adapter... you cant go DVI - DVI HDMI, Native on your video card
so if you want 3 monitors its DVI - DVI, and Display port adapter.. if you want 4 monitors its DVI- DVI - display port adapter - Display port adapter, im probably going to get an active display adapter myself... but i mean its like 35 bucks for the adapter >.< they just taking advantage of the people who dont want to go spend 300 bucks on a monitor with display port

Great, thank you! That is what I thought. Thanks for clearing that up.
And I totally agree! The active adapter prices are ridiculous! Luckily they just need to be an active adapter, not an externally powered one (which looks like they go for 100+, yikes)

Thanks again for all the help!
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