Today I successfully reproduced the installation process. 

OpenBSD 6.4
Machine type/ model: 7945B2G
Host firmware (UEFI) 1.22, build date 2018-06-04

System settings - Processors
 Power C-States <Enable>
 Report C2 to OS <Disable>
 Virtualization <Disable>
 VT-d <Disable>
 Cache Data Prefetch <Enable>
 Data Reuse <Enable>
 Execute Disable <Enable>
 Hyperthreading <Disable>

System settings - Memory
 Memory Speed Max Performance
 LV-DIMM Power <Low Power>
 Memory Channel Mode <Independent>
 Socket Interleave <NUMA>
 Patrol Scrub <Disable>
 Demand Scrub <Enable>
 Static Driver Impedance <Disable>
 Memory Refresh <1x>
 Thermal Mode <Performance>

System settings - Devices and I/ O Ports
 Configure IDE mode <Compatibility mode>
 Interrupt Round Robin <Disable>

System settings - Operating Modes
 Choose Operating mode <Performance Mode>

System settings - Legacy Support
 Rehook INT 19h <Disable>
 Legacy Thunk Support <Enable>

Boot Manager
 Change Boot Order
  <USB Storage>
  <CD/ DVD Rom>
  <Hard Disk 0>

The install medium must be the first in the boot order list.
You have to boot without using the Boot-Manager (F12).

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