Widescreen Gaming Forum

Hi!

I recently bought a new setup with 3 1080 p monitors and a 5870 2g with 6 mini dp. I have read that some passive dp to VGA works?

I now have 2 dvi so it will work with the dp to VGA as the third?

Is it possible to have 2 dp to VGA sp I can have one for my projector as screen nr 4? Or is it only possible with one?

My final question is... Will the screen that uses VGA have noticably badder quality the the dvi's?

Thanks a bunch :)

you can use 2xdp@DVI and 4x dp@ vga

vga quality is worse than DVI of course, and start I guess on 1680x1050 (on smaller I dont see a difference)
but if you use good thick vga cable (not stock thin one with blue plugs) quality should be a little closer to DVI

I beg you to tell me which of these three displays is using VGA vs. the two that are using DVI:







One of these is using a DP->VGA adapter while the other two are using DVI->DVI.

There are several of us who are using a similar setup and there is NO degradation of the image quality at all.

In addition to the IQ being on par with the DVI, I'm also having NO TROUBLE with flashing screens, lost signal, or other problems I had with the ACTIVE adapter I tried at first.

there we go again.. :doh

The first one is VGA, colour difference.
But in my opinion all three look bad :mrgreen:

If you want to game only: go for the DP-VGA! HP AS615AA is a good one.
Except for the 5970, i am returning mine at the moment.

Up until present day i never got one DP-VGA working on my 5970.

there we go again.. :doh

The first one is VGA, colour difference.
But in my opinion all three look bad :mrgreen:

If you want to game only: go for the DP-VGA! HP AS615AA is a good one.
Except for the 5970, i am returning mine at the moment.

Up until present day i never got one DP-VGA working on my 5970.

Sorry, but you're wrong. The first one is my main display and using DVI. You can see the very fine border of my hidden task bar at the bottom.

The poor quality of the images is due to NO light, and NO flash. It's the camera's fault, not the displays I'm using.

The poor quality of the images is due to NO light, and NO flash. It's the camera's fault, not the displays I'm using.

I know, just kidding.. Point is that we had this DP-VGA discussion for many times already. And i stick with it: i can see differences.
But maybe thats because i have 3 S-IPS 8-bit panels with true 16.7 mil colours. but lets not get into that discussion again.

If the DP-VGA works, it works. It didn't for me.. But again, maybe because my LP2065 have only DVI connections.

Thanks for good answers!

Anybody know why ATI made the cards that way? what is the reason that we cant use 6x dvi? is it to make displayport more known?

why can we have as many vga as we want but not dp til dvi?

Thanks for good answers!

Anybody know why ATI made the cards that way? what is the reason that we cant use 6x dvi? is it to make displayport more known?

why can we have as many vga as we want but not dp til dvi?

One answer: DisplayPort is currently Royalty-free whereas the others are not.

Interesting reading here....

http://en.wikipedia.org/wiki/DisplayPort

Displayport also has much more bandwidth to do things with.

Thanks for good answers!

Anybody know why ATI made the cards that way? what is the reason that we cant use 6x dvi? is it to make displayport more known?

ATI said it was about keeping the cost down. Using displayport to drive the 3rd + screens made the cards only a little more expensive which was important at the time because they didn't really know how popular eyefinity would really be or how soon and how good or cheap the Nvidia cards would be.

As it turns out they had no competition from Nvidia for a long time and eyefinity was quite popular but they didn't know that at the time they designed the cards.

why can we have as many vga as we want but not dp til dvi?

The VGA adapters actually convert the Digital displayport signals into anologue VGA and manage to aquire enough power from the displayport to accomplish this up to around 1080p resolution. So these adapters are Active.

The cheaper DVI adapters do not convert the signal. They just pass through one of the available DVI signals over the displayport so they are passive. The active DVI adapters require additional USB power and are a lot more expensive. I am sure it would be possible for someone to make a lower resolution DVI active adapter that is powered from the displayport but there was no market previously for such a device and they are making a lot of money on the dual link devices.

If the DP-VGA works, it works. It didn't for me.. But again, maybe because my LP2065 have only DVI connections.

I had the same experience using 3 x LP2065. Using the VGA adapter, even with top quality cable, gave an obviously inferior picture compared to DVI.

Mike.

[quote]The poor quality of the images is due to NO light, and NO flash. It's the camera's fault, not the displays I'm using.

I know, just kidding.. Point is that we had this DP-VGA discussion for many times already. And i stick with it: i can see differences.
But maybe thats because i have 3 S-IPS 8-bit panels with true 16.7 mil colours. but lets not get into that discussion again.

If the DP-VGA works, it works. It didn't for me.. But again, maybe because my LP2065 have only DVI connections.

If your displays have only DVI connections, how did you even manage to try any VGA adapters? :?:

The poor quality of the images is due to NO light, and NO flash. It's the camera's fault, not the displays I'm using.

Nope, pretty sure the poor quality of the images is due to you not knowing how to use your camera :).

(Hint: flash wouldn't have helped).

If your displays have only DVI connections, how did you even manage to try any VGA adapters? :?:

This is possible because HP supplies a DVI to VGA cable with its monitors. So VGA to DVI works (tried with a 8800GT & DVI-VGA adapter on my 5970). But no worky with the HP DP-VGA ctive adapter..

Also: never thought about it but ATI is not the only one using DP: Nvidia's professional line FX5800 and the new FX6000 also got DP!
http://www.techeye.net/hardware/nvidia-quadro-6000-takes-atis-high-end-crown
Nice detail: Fermi crushes Hemlock AGAIN..?

[quote]If your displays have only DVI connections, how did you even manage to try any VGA adapters? :?:

This is possible because HP supplies a DVI to VGA cable with its monitors. So VGA to DVI works (tried with a 8800GT & DVI-VGA adapter on my 5970). But no worky with the HP DP-VGA ctive adapter..
................

If I follow you correctly then, what you attempted is using a DP->VGA adapter plugged into the video card's DP port; connected the VGA end of the cable to the VGA connection on the adapter; and then connected the DVI end of the cable to the display's DVI connection.

If so, I would never have expected it to work.

I don't see how the signal could be converted "down" to VGA and then back "up" to DVI by a simple cable. Does HP claim that this cable is made to do that?

From several years of personal experience with ATI cards, you would need the special DVI->VGA adapter that comes with ATI's video cards to even get a conversion from DVI to VGA. While I know those work going from DVI to VGA, I'm not sure they would convert the signal in reverse.

Well, this works:

This also works with Cat 10.1 and below **EDIT** just tried works in 10.7 again!! it didn't with 10.3, 10.4, 10.5 (didn't bother with 10.6)** in conjunction with cable above:

And again, VGA quality is so bad on my monitor, it makes my eyes water!! Really i'm not kidding, you can already see it with TEXT ONLY..

And last but least: the HP doesn't work..

Sorry for the bad photograph->phone

i convert the dp to dvi using either the passive or active adapters, then use something called HDFury to go from DVI to VGA ... it comes with the shortest VGA cable i've ever seen in my life, and thats why its image is just about as sharp as a DVI image, only some of the colours are abit changed because of how the signal is interpreted by the monitor





trouble is that this thing can actually stop windows from booting in most monitor configurations, you have to leave it unplugged while windows boots up otherwise the computer stops sending all video signals and stops responding... i have only managed to get it to boot up by using one specific monitor setup , a 3x1 eyefinity span and a seperate monitor, not sure if there are any other combinations which work

And again, VGA quality is so bad on my monitor, it makes my eyes water!! Really i'm not kidding, you can already see it with TEXT ONLY..

And last but least: the HP doesn't work..

Sorry for the bad photograph->phone

Make a ticket in the troubleshooting section with description of picture and whats wrong, and I'll see what you can do to improve this. :)

Preferably you can also make pictures of DVI and VGA to highlight differences (though pictures never captures screen colors etc correctly, it might aid in figureing out whats wrong).

RE: Bad VGA image:

I know when I got my very first ViewSonic LCD, I was quite disappointed with the image I saw initially. In fact, some reviewers were really carping on how bad the image was on these. But, I found that, within the OSD there's a setting to use either AV or PC. When I switched it to PC everything became crisp and clear again. The colors are very vibrant and the image on VGA now is just as good as DVI with what I see with my own eyes.