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Active vs. Passive Displayport adapters *the truth* - Page 2

post #11 of 114
I have an Early 2009 Mac Mini with Mini DVI and Mini DisplayPort. And I have two 1080p HDTVs. The Mac Mini is capable of dual display, and I've gotten it to work before, so the issue is not the TV or Mac. And I have tried both Mirroring and No Mirroring.

I got a Mini DisplayPort to HDMI Adapter (#5311) and a Mini-DVI to HDMI Adapter (#4852) both from MonoPrice. And for some reason I can't get the Mac Mini to dual display, it's only one or the other.

Before I had a Mini Displayport Male and USB Male AUDIO to HDMI Female Converting Adapter (#5969) and I got video on both HDTVs, but not audio at the same time b/c one was USB and one was TOSLINK.

I'm not sure why I can't get video on both monitors.
post #12 of 114
I too am having the same problem as the user above (apple_pc). I got a Radeon HD5750 and bought a DP to Mini DP Cable (similar model) as above and connected it to the iMAC27". Same problem - it gets its signal and then goes dark for 20 seconds before returning to default. I probably have a passive adapter cable too. But I don't know where to purchase an active adapter DP to mini DP cable. Can anyone assist and does anybody know if this will really work? Thank you!
post #13 of 114
Quote:
Originally Posted by ozzren View Post
I too am having the same problem as the user above (apple_pc). I got a Radeon HD5750 and bought a DP to Mini DP Cable (similar model) as above and connected it to the iMAC27". Same problem - it gets its signal and then goes dark for 20 seconds before returning to default. I probably have a passive adapter cable too. But I don't know where to purchase an active adapter DP to mini DP cable. Can anyone assist and does anybody know if this will really work? Thank you!
make a new thread about this instead of hijacking this one.
post #14 of 114
Hi Guys

Recently got my 3 monitors and have run into some difficulty.

I have two monitors running on DVI and the 3rd is display port to HDMI

When i plug in all 3 i only get signal on the two DVI displays but if i plug in just the display port i get signal... any ideas? Im assuming i have a passive adapter but i had read that you only needed active adapters for monitors that were 30" and up

Any help would be awsome.... but looks like i might need to go buy an active adapter.....
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post #15 of 114
NECRO!

I'd recommend starting a new thread about this, as the post above your's states. Welcome to OCN by the way! smile.gif
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post #16 of 114
Boo double posts.
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post #17 of 114
hello, hopefully someone could answer, even though this thred is somewhat old smile.gif
I've been looking at dvi-dp adaptors to get my third monitor to work (all 3 is currently in dvi-dp passive adaptors)... thing is i can find roughly 2 kinds of active adaptors 1 with the extra usb connection at about 90$ and some without the usb at 30$, the cheap ones says that it's active but i'm confused about the price difference! is the normal cheap adaptors that says active on the package enough to get eyefinity to work even though they do not have external power?
post #18 of 114
Quote:
Originally Posted by Panickypress View Post

hello, hopefully someone could answer, even though this thred is somewhat old smile.gif
I've been looking at dvi-dp adaptors to get my third monitor to work (all 3 is currently in dvi-dp passive adaptors)... thing is i can find roughly 2 kinds of active adaptors 1 with the extra usb connection at about 90$ and some without the usb at 30$, the cheap ones says that it's active but i'm confused about the price difference! is the normal cheap adaptors that says active on the package enough to get eyefinity to work even though they do not have external power?

I'm just about to test a 5 display system with the cheaper non-usb adapters. I'll report my findings.
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post #19 of 114

I know there are other threads that cover this, but it seems like clear answers haven't exactly been given regarding the latest adapters...

 

If the adapter is not specifically labeled as Active, and it does not have an extra USB cable to provide power, the odds are it is passive. I tried a generic one like this when I couldn't find something specifically labelled as active at my local shops. What you will see is that your CCC shows three monitors connected, but you can only run 2 at a time. It will be impossible to setup a three monitor eyefinity group. 

 

When you have an actual active adapter, you will see three monitors in CCC again, but you can actually expand your desktop or clone to all three at the same time, no issues. You will also be able to setup an eyefinity group as well with no issues.

 

The cheapest ACTIVE adapter I found locally was the XFX one. No USB needed, just a display port, short cable (4" or so) and DVI port. Max res is 1900x1200 with this type. If you need a higher res, you will need one of the expensive usb powered active adapters. Example usage would be for running dual-link DVI monitors like 30" 2560x1600 beasts... If you can afford multiple ones of those, you can afford the better adapter. :)

 

NewEgg has a few to choose from in the $25 - $39 range. Saphire has some without USB now, as well as some other off-brand companies. Even more helpful, some are actually stating on their packaging if they are eyefinity compatible. In most cases, they appear to be correct. :)

 

Anyway, my testing was done with 5870's going to DVI only monitors. I'm about to test one more variable when I hook up my 5970 in eyefinity mode. I need a mini-displayport to regular displayport, then my active dp adapter to go to my DVI connection. Wish me luck... ;)

 

Have fun!


Edited by GrJohnso - 12/9/11 at 4:54pm
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post #20 of 114

He he he more confusions.

 

Only DVI-Dual-Link Active adapter needs USB power (Top picture). Single Link Active does not need USB power and it is still an active adapater (Bottom picture).

 

 

DPDual%20Cutaway.jpg

 

 

 

 

active_mDP_SL_cutaway.jpg

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