Graphic Card and Display

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JReames

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I'm currently running 2 ASUS EAH6870 in crossfire. I'm wondering if they will be able to have full use with 2 ASUS VG248QE

Slightly more technical:
I want to know if my two cards in crossfire can support 144hz. If not, what is the maximum hz?

Will they support the 1ms refresh rate.

I've seen some discrepancies in the ports on my card. Though physically DVI-D fits in both ports. Do both ports support DVI-D..
 
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Murissokah
I just realized my previous post might have just added to the confusion. I'll try to exemplify what I mean. Here's how it works:

1. Game engine creates lots of graphical tasks;
2. VGA driver assings the tasks;
3. GPU processes those tasks insanely fast. The result is a frame, an image;
4. Frame buffer is updated with the most recent game image, the one just produced in step 3;
5. Monitor samples the frame buffer;
6. Monitor displays the image;

Now what your 144Hz/1ms monitor will do is reduce the time spent between 4 and 6. The problem is that, if the GPU takes too long to update the frame buffer (task is too demanding), then the monitor will keep sampling the same image until there is a new one. If this happens, your monitor's high...
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brarboy

brarboy

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According to Asus for single EAH6870 gpu:
The maximum number of simultaneous display outputs supported by this graphics card is 4. You can achieve this with either of the following combinations:

1. Display port x2 + HDMI + DVI (with VGA labeled underneath)
2. Display port x2 + DVI x2

Note: HDMI port and DVI (DVI-D) port cannot be used as the same time.
Click to expand...
So nothing to worry about, you will be fully benefited. Just make sure to connect other monitor with DVI, not hdmi. And yes both will support both DVI-D/I.
 
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Murissokah

Murissokah

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Yes they will run in those settings. Having used a similar configuration before (XFX 6870 crossfire), I have to warn you that display setup may be too much for those cards, specially if you intend to game at 3840x1080@144. In my experience the 1GB buffer was a big bottleneck when using high image quality.

The 1ms/144hz specs on your monitor mean it will be able to update the screen very fast, and while your VGAs will work with it, there will be no real advantage if they can't produce frames fast enough.
 
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brarboy

brarboy

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yes it will because your monitor is capable of doing so. Rest comes down to gpu, in high end modern game there can be some problem that you can face due to insufficient vram of your gpu. Older games will give you smoother gameplay for they can display more frames per second than modern high end one.
 
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Murissokah

Murissokah

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They will.

My point is that if the cards can only update the buffer, say, 20 times per second (20FPS), then you will be refreshing the same image many times when running at 144Hz, which amounts to no advantage at all.

I have to admit I am no specialist in how the monitor-vga interaction works, but assuming it can be approximated to a common digital signal sampling, that would mean Nyqst-Shannon sampling theorem applies and you want to sample at twice the frequency of the signal. In short, if the buffer is updated 60 times per second (60fps), you want to sample at 120hz or more (monitor refresh). If you are running at 30 FPS, there is no gain in going over 60Hz.

Again, this is assuming some things I am not so sure apply to this case. What I am sure of is that those cards won't take proper advantage of the monitor's high refresh rate and low response time when running dual 1080p in demanding games.
 
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Murissokah

Murissokah

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Aug 12, 2007
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I just realized my previous post might have just added to the confusion. I'll try to exemplify what I mean. Here's how it works:

1. Game engine creates lots of graphical tasks;
2. VGA driver assings the tasks;
3. GPU processes those tasks insanely fast. The result is a frame, an image;
4. Frame buffer is updated with the most recent game image, the one just produced in step 3;
5. Monitor samples the frame buffer;
6. Monitor displays the image;

Now what your 144Hz/1ms monitor will do is reduce the time spent between 4 and 6. The problem is that, if the GPU takes too long to update the frame buffer (task is too demanding), then the monitor will keep sampling the same image until there is a new one. If this happens, your monitor's high refresh rate will be useless.

The high response time is always an advantage, though.
 
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