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I have a new custom built computer with the following graphics cards in it:
I would like to know if I would be able to run 4 40" tvs and 2 24' monitors if I ran two of these cards in crossfire mode.
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The XFX Double D HD-687A-ZDFC has 5 outputs (2x DVI, 2x miniDisplayport, 1x HDMI) which can be used to support up to 4 displays.
To run 6 displays you would need two of these cards.
You will have to run them as normal cards, not in Crossfire mode. (If you use crossfire then only the outputs on the main card will be used. The second card is used as a calculation unit and it will not output any signal).
Which already answers your question:
I would like to know if I would be able to run 4 40" tvs and 2 24' monitors if I ran two of these cards in crossfire mode.
No, you would six outputs on a single card to use CrossFire mode.
E.g. a newer version of this card.
Hennes
Posted 2012-12-13T23:24:01.077
Reputation: 60 739
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These cards will run three independent displays each if the third output (and beyond if it's a four-to-six port variant) is actually DisplayPort. If your displays don't support DisplayPort you'll need to use an active, not passive, adapter.
(Crossfire is totally irrelevant here - the cards should Just Work when you install them, no Crossfire necessary. I actually think it might disable outputs, it's honestly been long enough since I tried that I forget. I'm assuming you're talking about a modern OS - note that there is not driver support for this under Windows XP in any capacity).
EDIT: It looks like this XFX SKU is a bit of a nonstandard one, but I suspect the limitations are the same. This answer should be good for most near-reference Radeons released in the last few years as well.
Shinrai
Posted 2012-12-13T23:24:01.077
Reputation: 18 051
Why an active adapter? I've used a passive displayport to DVI converter before in a triple monitor setup and it's worked fine. – nhinkle – 2012-12-14T01:28:36.417
1@nhinkle - Existing Radeon cards specifically tend to have at least three outputs, but only two TMDS clocks, so they can't natively push three DVI or HDMI signals - that's why active conversion to DisplayPort. This should be covered on quite a few other questions. (There are a few SKUs that do some trickery to get around this, like dropping dual-link support on one output to support a third passively on some Sapphire 6770 and 7770s, or requiring identical EDID timing data across the monitors like the FirePro 2460, but this is not that common.) – Shinrai – 2012-12-14T01:39:00.687
Interesting. I'm driving one monitor at WQHD on dual-link DVI, another at 1080p on regular DVI, and a third at 1680x1050 on a passive DP->DVI converter. – nhinkle – 2012-12-14T02:28:28.057
1Do you mean 24 inch monitors, or 24 foot monitors (as you typed)? – Michael Hampton – 2012-12-14T17:24:35.987