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Probably you'll loose the ability to boot without iGPU then - EF67 isn't an invalid id... This invalid id prevents to load something (EFI driver/GOP) before Clover loads. BTW, the 3.rd DF67 you replaced seams not to be an id, it can be also be found on RX460 BIOS...

So you have managed to get your RX480 running without iGPU by editing three bytes in the card's ROM??? As I understand, you have placed an invalid device id in it, right?

@jerryy2345: I've connected DVI and DP simultaneously (DVI and HDMI alternatively). Both combinations (DP/HDMI is physically the same monitor) work well with the Berbice patch. This was not the case with my previous DSDT.aml. The reason was HECI to IMEI rename in it (recommended for Skylake and...

My problems with only one display at time with RX460/10.12.4 are DSDT related. Especially HECI->IMEI rename seams causing the problem. Mork's/Jerry's Berbice patch is working now. Thanks!

You mean GUI|ScreenResolution? This is only for Clover boot-screen (which runs on separate monitor connected to HD530) and is set to 1920x1080px...

4K@DP, HD@DVI&HDMI. No signal on DP without Inject ATI. There is no framebuffer anymore with 3 ports within 9510.kext, perhaps this is a problem with RX460...

Thank you for your effort, Jerry! Yes, now i noticed it: All ports work, but only one at time! My card don't even likes two monitors at once! Booting with all three monitors results in video in DP, but DVI and HDMI are black. Booting with DVI and HDMI: HDMI works, DVI is black. Booting only with...

Thank you very much, Jerry! I will try it tomorrow...

Sorry Mork, I not talking about your Berbice patch for RX480, but about your Berbice patch for RX460 in post #2130: where the original Berbice: 020000000001000039050108000000002001010100000000 —> internal Display 000400000001000000010243000000001000020200000000 -> DVI (DisplayPort indeed)...

You are not using DVI, don't you? There must be some transposed digits in DVI-part of Mork's Berbice RX460 patch you are using: 000400000001000000010243000000001000040500000000 -> DVI DVI-DL should start with 04, not with 0004 (which is DP). Unfortunately, I not able to patch remaining part of...

I'm using Gigabyte RX460 4GB. It was necessary to use Mork's Berbice FB-patch for RX460 from post #2130 to get Displayport running after updating to 10.12.4. Displayport works now, but DVI don't. Edit: @Mork_vom_Ork - regarding your Berbice-patch from post #2130: could you please verify your...

Have someone managed to get 4K@60Hz using the RX460 via HDMI? RX460 is HDMI 2.0 capable, my monitor (LG 27UD68) too. I'm getting 4K@60 Hz on Displayport, but only 4K@30Hz on HDMI. I'm using original LG high speed HDMI cable. Thanks!