Bench Mark, CustoMac

[Review] Intel i9-9900 X-Series + GA-X299 Designare EX+ Dual LG Ultrafine System in macOS Mojave

Hi folks!

Finally I am writing about this build to share you guys. It would be my final build for several years. I finished almost of all post installation and I am very satisfied with this Powerful RIG. I am so happy to share this review.

Detail Specification

First please check my components below:

  • CPU: Intel® Core™ i9-9900X X-series Processor
  • GPU: Sapphire Vega 64 Liquid-Cooled
  • Mother Board: Gigabyte X299 Designare EX
  • Cooling: NZXT Kraken 62
  • Memory: G.skill RGB 128gb – 3000Mhz
  • Storages: WD-BLACK SN-750 1T x 2
  • Monitors: LG Ultrafine 5K x 2
  • PSU: Rosewill PHOTON Series 1050W
  • WIFI/BT4.0: Broadcom PCI adaptor
  • Input: Apple Magic Keyboard and Trackpad 2
  • Speaker: ACTON BT/Marshall
  • TB3 Docking System: Kensington SD 5200T


I know this is kind of over pricey Customac but I am pretty much happy with it rather having an iMac Pro. Since this RIG’s performance is much much better than iMac Pro (You can ignore Ultrafine monitors which is quite pricey parts). For the detail installation guide is on my previous golden build. There is separated EFI for i9-9900X in the guide.

Please use the guide below:


Currently I am using Mojave 10.14.5 Beta3. Update are smoothly from 10.14.4 Public. There is a good new for Vega VII card in 10.14.5 that not officially support that new AMD GPU now. I am still using Vega64 but I would try Vega VII later when I get the card (Hard to get it now).

Mojave 10.14.5 Beta in X299 + i9-9900X

This CPU could do Turbo up to 4.5Ghz natively but I tried 4.7Ghz OC. It is easily Overclocked in BIOS and Intel’s Powergodget is working very well.

Idle Temp is around 35 or less.

PCI Devices

I finished detail mapping for all PCI information in SSDTs except TB3 Dock which was tricky part for me. If you do not have it, it is fine.

PCI Implementation applied by SSDTs


Two TB3 ports are working well with Ultrafine 5K but only 4K resolution is available in each monitors. If you only have a LG Ultrafine 5K, 5K resolution is on the monitor.

TWo 5K monitors connected by TB3 ports.
Two Monitors fully working in 4K Nativerly with all USB functions.

Vega64 and almost of all AMD GPUs are now compatible with Mojave well. My Vega64 enabled H.264 and H.256 in FCPX and other media editors like Davinch Resolve.

Checked support H.264 and H.265

USB ports

USB port limit patch is fixed as well with proper power delivery. So you do not need to care about further USB patches.

USB Extra power working well

NVME Storages

I am using Two NVME each the same models, one for main system and the other one for system Backup. Read/Write speed is Fast enough like windows and properly working.

WD BLACK SN750’s Speed’s Read/Write


My one of reason to choose this RIG is Memory size support up to 128GB. I have full slots now with G.Skill Brand. XMP enabled to 3000MHz as well.

Full Bank of Memory slots with XMP

Bench Marks

RX Vega64 + CPU score in LuxMark ball.
Only CPU Bench
Only Vega 64 Bench
Cinebench R15

I little disappointed Mojave’s update 10.14.5 makes much lower score in Vega64. However, this score is depended by cable speed and Monitors resolution as well. It should probably around 130-150FPS in a HD monitor.

Geekbench4, Skylake Refresh much better than 7900X

Extra Thought

This is pretty much about my review. Everything is working working!!

Gigabyte X299 Designare EX has built-in Alpine Ridge chipset and that is one thing I regretted. But this build is much stable than Z390 series with iGPU setting. Plus, I have dual OS system with Windows 10 pro which is good for playing games as well. My only games in Mac are Civilization VI and Tomb Raider. Both games need quite good GPU and CPU powers and my RIG is the perfect for both games. My uses for this RIG is mostly for 4K editing in FCPX. Much non-stressful with Quicksync in Z390. But this does not mean Z90 is not a good system in Customac. Specially Z390 Designare is very good iMac build supporting with intel QuickSync.

Last modified: November 11, 2019

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How to build your Customac iMac Pro in Mojave 10.14 with Intel 8th & 9th generation CPU system + TB3 + LG UltraFine 5K - Climb Joe's Coffee Break

[…] [Review] Intel i9-9900 X-Series + GA-X299 Designare EX+ Dual LG Ultrafine System in macOS Mojave […]


Hi Joe,
I have an x299 system with 7900X CPU on mb Asus Prime X299-Deluxe and Gigabyte Titan-Ridge PCIe TB3 controller, but I was thinking of renewing the motherboard with one that has built-in TB3 ports.
What about this Designare EX? Does the TB3 hotplug work with your SSDT?
Thank you very much.



Hi Joe,

First I am sorry for my poor English , I am French.
I have bought this components :
-i9 9980 xe
-GA x299 designare Ex
-32 Go Ram (Ballistix Elite 2666, 4×8 Go)
-VEGA 64 nitro +
-Dark rock pro 4 (and I have Kraken 62 too)
-PSU EVGA G2 1300 W
-SSD Crucial MX500 250 Go (x2, I would like to make dual boot with windows 10)
-Case : Fractal design R5
-3 HDD
-LG 38UC99W

Before purchasing your EFI + SSDT, I want to be sure it will work with my components.

Thank you



Thanks for your guide Joe. To be clear — were you able to use a single LG Ultrafine 5K monitor at 5K without any issues?