FORUMS: list search recent posts

Performance loss with Eyefinity and 8 monitors.

COW Forums : Live & Stage Events

<< PREVIOUS   •   VIEW ALL   •   PRINT   •   NEXT >>
Aaron Kiersky
Performance loss with Eyefinity and 8 monitors.
on Apr 13, 2011 at 3:32:34 pm

I'm trying to build an 8 screen monitor wall. I have 2 RadeonHD 5870's
with Eyefinity 6. 6 screens are in card 1 and two are in card 2. All
are using active DVI to displayport adapters.

The setup works alright to the eye for the most part, but when I run a
simple framerate test (a bunch of dots generated with Processing) I
find that my framerate gets cut in half if the app window is spanning
both cards' screens.

Is this some inherent flaw with multi-GPU setups? Could my power
supply be over taxed? (its 950W) I'm totally at a loss here.


Return to posts index

Thomas Leong
Re: Performance loss with Eyefinity and 8 monitors.
on Apr 13, 2011 at 4:50:35 pm

Doubt if it is the power supply. The usual symptom for lack of power is a sudden re-boot of the computer rather than loss of frame-rates.

One symptom of a graphics card's GPU slacking is that the video frame-rate would slow down relative to the audio, i.e. audio and video gets out of sync pretty early. Is that the case with your tests?

Haven't tried Eyefinity cards myself. New territory for most I guess.

The main problem with 2 cards' outputs would likely be gen-lock between the two, i.e. does whatever is on-screen remain in sync or does it break-up (horizontal or vertical tear depending on your arrangement of the parts relative to the outputs from the 2 discrete cards). Think the player used also matters.

I have tried successfully 4 mpeg-2 playback out of my one desktop with 2 older non-Eyefinity Radeon cards (X-series). Looped them all day and frame-sync remained perfect over the 4 full-screen outputs (2 from each card). I am using a dongled software sold specially for multi-display playback though I was using it beyond its advertised 2 full-screen outputs. Therefore suggest you test more with video playback or something close to what you would be using the 8 outputs for.

Thomas Leong



Return to posts index

Walter Soyka
Re: Performance loss with Eyefinity and 8 monitors.
on Apr 18, 2011 at 6:22:28 pm

[Aaron Kiersky] "The setup works alright to the eye for the most part, but when I run a
simple framerate test (a bunch of dots generated with Processing) I find that my framerate gets cut in half if the app window is spanning both cards' screens."


There are a lot of variables here. The problem might not be the displays -- it could be Processing. How does the sketch work? Is it using OpenGL?

If you play a movie spanning screens (outside of Processing), do you see it dropping frames?

Walter Soyka
Principal & Designer at Keen Live
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
RenderBreak Blog - What I'm thinking when my workstation's thinking
Creative Cow Forum Host: Live & Stage Events


Return to posts index

<< PREVIOUS   •   VIEW ALL   •   PRINT   •   NEXT >>
© 2017 CreativeCOW.net All Rights Reserved
[TOP]