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Error 55 GA-Z170X-UD5

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I assume this is what you have

Vengeance® LPX 8GB (1x8GB) DDR4 DRAM 2666MHz C16 Memory Kit - Black (CMK8GX4M1A2666C16)

Technical Specifications

Density: 16GB (2x8GB)
Speed: 2666MHz
Tested Latency: 16-18-18-35
Voltage: 1.2V

Anyway, on page 46 of your user manual under Standard Timing Control for each ram stick, change the timing mode to manual then enter the timing values like 16-18-18-35 and 1.2V in the BIOS.
Also in the PC Health Status under MIT tab, make sure the ram voltage reading is what is set by the BIOS. If not then you will need to bump it up so it reads just barely above what is needed.
It's been my experience that the VRM's on most MB's may put out less that what is set in the BIOS. Like 1.2V reads 1.16V in PC Heath Status page.

Also after looking at a pic of the MB, use the gray mem sockets.
 
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