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Started by A_HungryPanda | | 2 answers
Fourth monitor help
I recently picked up a MSI R9 280x and I am having trouble figuring out to add a fourth monitor.

I have 1 mDP to DVI, 1 mDP to HDMI, an HDMI and 1 DVI used in the back of the card.

I cannot extend my display to the mDP to HDMI (My T.V.)
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a c 117 C Monitor
October 15, 2014 1:36:02 PM

Are those active dp adapters?
a b C Monitor
October 15, 2014 12:48:45 PM

A single R9 280X can only send 2 kind of image stream. So you need to have 2 pair of identical monitor to get image on four monitor. Also, i am not completely sure a R9 280X can do 4-monitor setup.

EDIT :

Here a more detailed explanation i gave to someone :

Quote:

Thanks to some firmware and board level changes, with the 200 series AMD is now able to attach multiple TMDS transmitters/interfaces to the same clock generator, allowing one clock generator to be used to drive multiple displays. As a result it’s now possible to drive up to 3 TMDS interface displays off of a single 200 series card, albeit with restrictions.

The catch here is that these can’t be independent displays, and this change is primarily intended towards enabling Eyefinity with cheap, DVI/HDMI-only monitors. To utilize clock sharing and to drive 3 such monitors off of a single card, all 3 monitors must be timing-identical, which functionally speaking almost always requires the monitors to be completely identical. Furthermore the sharing of the clock generator can only be engaged/disabled upon boot, so the 3rd display cannot be hot-plugged and must be present at boot time. Consequently this is by no means as unrestricted and easy as having native support for 3 TMDS interface displays, but for Eyefinity it will get the job done.

Of course this restriction only applies to using 3 TMDS interface monitors off of a single card natively. Using the DisplayPort, either with a native monitor or through an active DP-to-DVI/HDMI adapter, still allows the same fully independent functionality as before.

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