64GB RAM - Post Error: Code 51 with new GA-Z170X-UD5 TH on El Capitan

Not open for further replies.
Aug 13, 2016
Gigabyte Z390 Aorus Master
i9 9900k
Dual GTX 1080 Ti
  1. iMac
  2. Mac Pro
Hey all,

I built my hackintosh and got everything running fine on el capitan.
I used this guide, as the board and components were similar:

However, the motherboard is giving error code 51 when it enters the OS.

On boot, it cycles through the normal checks, then sits on 99. When the loader goes to OSX, it shows 61 for a few seconds, then 51.

20-156-087 Ballistix Sport LT 64GB (4 x 16GB) 288-Pin DDR4 SDRAM DDR4 2400 (PC4 19200) Desktop Memory Model

I reseated the ram and cpu, tried 1 stick, then 2 and believe it returned a different RAM code error (55).
Then 4 again. Same error (51).
I called and checked gigabyte's forums. Some say this could be caused by bios settings.
I'm currently using ver. F5 and considering F6F beta bios flash, as it may have better RAM compatibility.

I checked with windows, same code occurs. I boot directly to OSX without the loader, same error.

The system settings shows that 64gb are installed, at 2400 speed. I'm concerned it may only be running at 2133.
When I try to adjust speed settings to OC the CPU, the OS won't load until i change to default.

If anyone has advice on either this RAM error or a quick fix for the CPU OC, please let me know.

GTX 980 TI Hybrid

Samsung 850 1TB SSD x2

13-128-839 GIGABYTE GA-Z170X-UD5 TH LGA 1151 Intel Z170 HDMI SATA 6Gb/s USB 3.1 USB 3.0 ATX Intel Motherboard

17-139-055 CORSAIR RM Series RM750 750W ATX12V v2.31 and EPS 2.92 80 PLUS GOLD Certified Full Modular Active PFC 80 Plus Gold RoHS WEEE EuP Modular ATX12V & EPS12V Power Supply Power Supply

19-117-559 Intel Core i7-6700K 8M Skylake Quad-Core 4.0 GHz LGA 1151 91W BX80662I76700K Desktop Processor Intel HD Graphics 530

20-156-087 Ballistix Sport LT 64GB (4 x 16GB) 288-Pin DDR4 SDRAM DDR4 2400 (PC4 19200) Desktop Memory Model BLS4K16G4D240FSC

33-704-133 TP-LINK TL-WDN4800 Dual Band Wireless N900 PCI Express Adapter, 2.4 GHz 450 Mbps / 5 GHz 450 Mbps, IEEE 802.1a/b/g/n, WEP / WPA / WPA2, Plug & Play in Windows 8

35-181-058 CORSAIR Hydro Series H75 CW-9060015-WW Water / Liquid CPU Cooler 120 MM
Not open for further replies.