How to build your own iMac Pro [Successful Build/Extended Guide]

[joevt]

The iMac Pro and some MacBook Pros allow connecting up to two LG UltraFine 5K displays - one per Thunderbolt 3 controller.

You need four DisplayPort 1.2 outputs connected to two Thunderbolt add-in cards to support two LG UltraFine 5K displays. I think the Vega 64 only has three DisplayPorts? You could try using a HDMI 2.0 to DisplayPort 1.2 adapter, but you would have to do some work to make the macOS think the HDMI output is a tile of the LG display (don't know if that's possible) and the graphics driver would have to be able to allow using the HDMI output as half of the display (I don't know if it will allow it).

But if the Vega 64 supports DisplayPort 1.4 (I think so), and macOS supports DisplayPort 1.4 (I haven't seen anyone confirm that), then you could use a DisplayPort 1.4 5K single link SST display (the LG UltraFine 5K is a dual link SST display) per DisplayPort output.

It would be cool if someone made a DisplayPort 1.4 SST to dual link SST display adapter which would allow using old dual link SST displays like the LG 5K or Dell 5K more efficiently with newer graphics cards that support DisplayPort 1.4. A DisplayPort 1.4 MST hub may be sufficient but will require EDID overrides to make macOS treat the two streams as two SST tiles of one display, but macOS doesn't support MST in that way. macOS does support MST for old 4K displays that use separate streams for the left and right halves, but I don't know if macOS would support that method for a virtual DisplayPort 1.4 MST 5K display (to be clear, dual link SST is not the same as MST).

 

[drevan]

If I had 4xDP ports...Yes, but with 1DP I don't think I can get the 5k to work even if I goes trough the AIC Card.

 

[RuleBreaker01]

Apparently the GC-Titan Ridge perfectly works on X299 with the 34" LG 5K .. see this feedback !

I believe he was referring to the LG 5K Ultrafine (the one sold on the Apple Store)

 

[RuleBreaker01]

If I had 4xDP ports...Yes, but with 1DP I don't think I can get the 5k to work even if I goes trough the AIC Card.

The Titan Ridge could allow that. But now someone would need to produce a 5K Thunderbolt screen using a DP 1.4 SST. That screen would currently only work on the 2018 macbook pro 15" when using the AMD graphic card (the intel IGP only supports DP 1.2)

In the future, this will likely happen, but for now we're stuck on 5K screens requiring dual SST 1.2 as that's what the vast majority of existing machines can do.

And as such, it limits current PCs to a single 5K screen.

 

[izo1]

The iMac Pro and some MacBook Pros allow connecting up to two LG UltraFine 5K displays - one per Thunderbolt 3 controller.

You need four DisplayPort 1.2 outputs connected to two Thunderbolt add-in cards to support two LG UltraFine 5K displays. I think the Vega 64 only has three DisplayPorts? You could try using a HDMI 2.0 to DisplayPort 1.2 adapter, but you would have to do some work to make the macOS think the HDMI output is a tile of the LG display (don't know if that's possible) and the graphics driver would have to be able to allow using the HDMI output as half of the display (I don't know if it will allow it).

But if the Vega 64 supports DisplayPort 1.4 (I think so), and macOS supports DisplayPort 1.4 (I haven't seen anyone confirm that), then you could use a DisplayPort 1.4 5K single link SST display (the LG UltraFine 5K is a dual link SST display) per DisplayPort output.

It would be cool if someone made a DisplayPort 1.4 SST to dual link SST display adapter which would allow using old dual link SST displays like the LG 5K or Dell 5K more efficiently with newer graphics cards that support DisplayPort 1.4. A DisplayPort 1.4 MST hub may be sufficient but will require EDID overrides to make macOS treat the two streams as two SST tiles of one display, but macOS doesn't support MST in that way. macOS does support MST for old 4K displays that use separate streams for the left and right halves, but I don't know if macOS would support that method for a virtual DisplayPort 1.4 MST 5K display (to be clear, dual link SST is not the same as MST).

DisplayPort 1.4 takes care of all of that and yes Vega 64 supports DP 1.4.

You don't need to get the UltraFines. There should be some monitors out there already that support a single DP 1.4 connection for 5k already and more coming out early 2019.

Such as this one...
https://www.lg.com/us/monitors/lg-34WK95U-W-ultrawide-monitor

 

[pieropontra]

Hi there! does anybody with multi monitor setup have this issue?

As you can see in the image attached, I got menu bars (the ones on the top side of macOS) on both monitors but, since this morning, a bug occurred. The non active monitor (no app highlighted) shows a useless bar (non menus and a strange white background) and this bug switches from display to display based on the monitor where I'm using the app at the moment. The same bug occurred on my iMac genuine Apple with High Sierra, now I got this even on my Mojave hackintosh so I think it's a macOS bug not related to hackintoshing. It's driving me crazy, anybody solved it someway?

 

[izo1]

Hi there! does anybody with multi monitor setup have this issue?

As you can see in the image attached, I got menu bars (the ones on the top side of macOS) on both monitors but, since this morning, a bug occurred. The non active monitor (no app highlighted) shows a useless bar (non menus and a strange white background) and this bug switches from display to display based on the monitor where I'm using the app at the moment. The same bug occurred on my iMac genuine Apple with High Sierra, now I got this even on my Mojave hackintosh so I think it's a macOS bug not related to hackintoshing. It's driving me crazy, anybody solved it someway?

Post specs of your monitor.

Also try disabling the following in System Preferences temporarily to see if the problem goes away.

Also in the 2nd attached image make sure the top is aligned for both monitors, that is if they are not the same res, try matching the top at least and not to the bottom.

 

[kgp]

I believe he was referring to the LG 5K Ultrafine (the one sold on the Apple Store)

Sure.. he specified it afterwards..

 

[kgp]

The iMac Pro and some MacBook Pros allow connecting up to two LG UltraFine 5K displays - one per Thunderbolt 3 controller.

You need four DisplayPort 1.2 outputs connected to two Thunderbolt add-in cards to support two LG UltraFine 5K displays. I think the Vega 64 only has three DisplayPorts? You could try using a HDMI 2.0 to DisplayPort 1.2 adapter, but you would have to do some work to make the macOS think the HDMI output is a tile of the LG display (don't know if that's possible) and the graphics driver would have to be able to allow using the HDMI output as half of the display (I don't know if it will allow it).

But if the Vega 64 supports DisplayPort 1.4 (I think so), and macOS supports DisplayPort 1.4 (I haven't seen anyone confirm that), then you could use a DisplayPort 1.4 5K single link SST display (the LG UltraFine 5K is a dual link SST display) per DisplayPort output.

It would be cool if someone made a DisplayPort 1.4 SST to dual link SST display adapter which would allow using old dual link SST displays like the LG 5K or Dell 5K more efficiently with newer graphics cards that support DisplayPort 1.4. A DisplayPort 1.4 MST hub may be sufficient but will require EDID overrides to make macOS treat the two streams as two SST tiles of one display, but macOS doesn't support MST in that way. macOS does support MST for old 4K displays that use separate streams for the left and right halves, but I don't know if macOS would support that method for a virtual DisplayPort 1.4 MST 5K display (to be clear, dual link SST is not the same as MST).

@joevt,

the GC-Titan Ridge fully supports DP1.4! You do not need four DisplayPort 1.2 outputs connected to two GC-Titan Ridge Add-In Adapters to support two 5K displays. 2x DP1.4 outputs connected to 1x GC-Titan Ridge should allow to drive 2x 5K displays without any problem. That's just the advantage of the GC-Titan Ridge when compared with the former GC-Alpine Ridge or the TBEX 3!

I suppose that the two TB displays can be in the same TB daisy chain. It also should be possible to connect the two monitors via the two TB3 ports of the GC-Titan Ridge, or to connect one monitor via one of the TB ports and the other monitor via the DP1.4 port of the GC-Titan Ridge.

As soon also Amazon offers the LG 34WK95U-W, I will purchase one and perform an in-depth testing, also in line with my current LG 38" in dual 5K/4K monitor configuration. If the LG 34WK95U-W works as expected, the LG 38" finally ends up on Ebay.

 

[pieropontra]

Post specs of your monitor.

Also try disabling the following in System Preferences temporarily to see if the problem goes away.

View attachment 355418

Also in the 2nd attached image make sure the top is aligned for both monitors, that is if they are not the same res, try matching the top at least and not to the bottom.

View attachment 355419

I've done the Misson Control trick with no luck, doesn't work. My monitor are aligned and same res (they are the same model LG 27UD69 4K) linked via DP to a Vega RX 64 + whatevergreen.kext