Custom Resolution Utility (CRU)
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12-24-2014, 01:38 PM
Post: #1182
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RE: Custom Resolution Utility (CRU)
(12-23-2014 05:25 PM)neoxatax Wrote: I have achieved 4K at 60Hz with the LG TV, using a HDMI to HDMI cable on a Macbook Pro Retina with a Nvidia 750M in Windows 8 on Bootcamp. So it is possible to pump 60Hz through HDMI 1.4 (the Macbook is not 2.0).In that case, the hardware is capable of handling higher pixel clocks and might be 2.0-capable even though it's only rated for 1.4. As far as I have seen, 6000-series and 7000-series cards can't handle higher pixel clocks with HDMI. I don't know about the R9 290-series cards, but the driver doesn't currently allow it. That may change with future driver or firmware updates. (12-23-2014 05:25 PM)neoxatax Wrote: If a 750M can output 4K60Hz through HDMI and this guy has achieved 4K at 45Hz on two displays using your tools with a 6990, the question is, would a Minidisplayport to HDMI cable achieve anything higher than 30Hz on a 6950? It has 2 Displayport outputs but my LG only HDMI 2.0 inputs.An adapter is not going to work unless you can find an active DisplayPort to HDMI 2.0 adapter, which doesn't currently exist as far as I know. There aren't even any adapters that can handle the full 340 MHz bandwidth for HDMI 1.4, and most can't even handle more than 225 MHz. (12-23-2014 05:25 PM)neoxatax Wrote: Would a 6950x2 in Crossfire improve the refresh rate? How do think that guy on the other forum achieved 45Hz, via Displayport to Displayport?He doesn't say whether he's using HDMI or DisplayPort, but it's not currently possible to add 3840x2160 @ 45 Hz when using HDMI with a 6990, and he says he's using two monitors while the 6990 only has one HDMI port, so he has to be using DisplayPort. CrossFire will not improve the refresh rate and may even cause additional problems with games at higher pixel clocks because CrossFire has its own limitations. |
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