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Abrupt reboot starting UBCD mersenne prime test 28.5 [new'ish build]

Level 7
Motherboard model: REV 10
UEFI Version: 1502
CPU: 6850k
Memory kit part number (s) and amount in GB: 128GB, 2x HyperX FURY 64GB kit (HX424C15FBK4/64)
GPU: 1080 + TitanX (2nd for compute only)
SSD/HDDs/Optical drives: 950 Pro M.2
PSU: Corsair Ax1200i
USB Devices (model/version number): Apple USB Keyboard
Monitor: 2x Dell U2515H
CPU Cooler: Corsair H115i
PC CASE: Thermaltake Core X5 Riing
Operating system: None
System Overclocked (provide details)? None. @ BIOS, F5 save and exit.

UBCD mersenne prime test 28.5 causes machine to reboot shortly after start.

Stable system, run cpu @ spec w/ 128GB RAM (2133 or 2400, don't care)

All was working in prior case using optimized defaults (F5) since Sept'16.

Moved parts to new case and treating as complete new build. Assembled, cleared CMOS, F5, check voltages and thermals in BIOS monitor tab -- all looks good. Select UBCD USB boot stick and launch mersenne prime test 28.5, < 1s after test begins reboot. No diagnostic qcode to speak of.

Checked SPD and build dates on all dimms. The two kits differ and made sure when testing 64GB all modules were from same kit.

Troubleshooting - FAIL

  • Linux Mint LiveCD + Stressapptest (same reboot scenario)
  • Re-seat RAM
  • Re-seat CPU
  • Remove all components except for 1080 and UBCD boot USB stick
  • BIOS 901, 1003, and 1502
  • Repeat using each 64GB kit individually, using dips and physically (yes this sucked)

    • Use 1x 64GB kit (A1,B1,C1,D1)
    • Use 1x 64GB kit set to 2133 (A1,B1,C1,D1)
    • Use 1x 64GB kit (A2,B2,C2,D2)

Troubleshooting - Success

  • Full build + UBCD Memtest86+, not stressing CPU, single thread. No reboot after 20min, didn't run for full test.
  • Full build + set sync cores to 12
  • 1x 64GB kit w/ disable Asus Multicore Enhance + Intel Speed Step disabled + Turbo, and set sync cores 36

Rather not throw money at the problem since that won't change me. 😄 Although I did underestimate how effectively I was going to use cores, a 6950k would be better.

Ideas on how to pragmatically solve this?