If you are having similar issues with certain CPU selection modes and your motherboard is not on the list, please post the following details so that we can add it to the list:
- Motherboard model number
- BIOS version
- CPU
- Summary of the issue you are experiencing
Background
On certain older Supermicro chipsets, there is a known issue with the UEFI firmware's multiprocessor implementation. The possible symptoms of this issue are the following:
- Hang on MemTest86 startup during multiprocessor test
- Hang when running tests in PARALLEL CPU mode (Tests 2-13)
- Run in Single CPU mode
- Add the motherboard to the blacklist to disable multiprocessor support
According to the Supermicro BIOS team, the root cause of the problem was found to be in the EFI_MP_SERVICES_PROTOCOL implementation.
It is believed to be related to "WakeUpAP" timing. "Start-up IPI sequence"(IOAPIC) is sent to all processors (excluding itself) when "WakeUpAP" is hooked by MPServices. The possible cause could be the previous core is still busy but the next core has been called at the same time.(Each CPU has its own capability)
A fix has been implemented and is currently being verified with Intel, and will likely be applied to the next firmware update.
At the moment, the fix applies to the following motherboards:
- C7X99-OCE-F (Latest affected revision: v2.1a)
- C7X99-OCE (Latest affected revision: v2.1a)
- X10SRA (Latest affected revision: v2.1a)
- X10SRA-F (Latest affected revision: v2.1a)
| Motherboard | BIOS version | CPU | Notes |
| ASRock 970M Pro3 | 1.30 | AMD Phenom II X6 1090T BE | Freeze on Parallel, Sequential, Round Robin. Freeze on Single for all CPUs except CPU0 Reference |
| Asrock 970 Extreme3 R2.0 | 1.6 to 2.2 | AMD Phenom II X2 550 | Freeze on Parallel, Sequential, Round Robin. Freeze on Single for all CPUs except CPU0 Reference |
| ASRock P67 Extreme6 | ? | ? | Parallel runs fine (4 passes without problems) Freeze on Sequential after test 1 (after CPU core switch) Reference |
| HP 15-ab153nr | F.13 | AMD Quad-Core A10-8700P APU | Freeze on Parallel, Sequential, Round Robin. Especially CPU1 on Test 3 Reference |
| Gigabyte GA-Z97MX-Gaming 5 (1.0) | F4 | Intel I7 4790K | Freeze on Sequential, Round Robin when cycling through the CPUs. Eg. 0 -> 1 -> 2 -> ... n -> 0 -> 1 [Freeze] Reference |
| Gigabyte GA-Z170MX-Gaming 5 (rev. 1.0) | F4 & F5e (BETA) | Intel i5-6500 | [Single] Runs fine on CPU0, all other CPUs goes to start the test and restarts right away [Parallel] Runs on CPU0 but says "[CPU Error] Could not start CPU 1-3" [Round Robin] Immediately restarts on first test attempt [Sequential] Same as Round Robin Reference |
| Gigabyte GA-Z170X-Gaming 7 | F6 | Intel i7-6700K | [Single] Runs fine on CPU0, all other CPUs goes to start the test and restarts right away [Parallel] Runs on CPU0 but says "[CPU Error] Could not start CPU 1-7" [Round Robin/Sequential] Runs the first 3 tests on CPU0 then restarts maybe the moment it tries to go to the next CPU Reference |
| Gigabyte GA-Z170X-Gaming GT | F6 F7 |
Intel i7-6700k | [Single] Runs fine on CPU0, all other CPUs goes to start the test and restarts right away [Parallel] Runs on CPU0 but says "[CPU Error] Could not start CPU 1-7" [Round Robin/Sequential] Runs the first 3 tests on CPU0 then restarts maybe the moment it tries to go to the next CPU Reference |
| Gigabyte GA-Z170X-UD3 | F6 | Intel i5-6600K | Cannot switch BSP to another CPU other than 0 Cannot start any APs in parallel mode. Reference |
| Gigabyte GA-Z170-HD3P | F5 | Intel i5-6600K | WhoAmI failed Cannot start any APs in parallel mode. After updating the motherboard firmware to F20 (Release Date Nov 9, 2016) MemTest86 ran in multi-core mode. |
| GA-H170-D3HP | F4 | Intel i3-6100 | WhoAmI failed Cannot start any APs in parallel mode. |
| Gigabyte GA-990FXA-UD3 (rev. 4.0) | F3 | AMD FX 9590 | Freeze on test 3 using CPU 0. Hangs on any other processor. Reference |
| Gigabyte 990FXA-UD5 | ? | AMD FX 4350 4.2 Quad Core & AMD FX 8350 | Freeze on Parallel, Sequential, Round Robin Reference Unexpected RAM errors on test 3 and generally unstable motherboard when in parallel mode. Reference Freeze / Hang in parallel mode. But single CPU modes run OK. Turned out not to be a BIOS issue, but user pushed a CPU overclock too far. Reverting to stock clock speeds fixed problem. Reference. |
| Gigabyte GA-970A-DS3P v2.0 | FC | AMD Phenom II x4 945 CPU | Freeze on Parallel, Sequential, Round Robin. Freeze on Single for all CPUs except CPU0 Reference |
| Gigabyte X99 Ultra Gaming X99-Ultra Gaming-CF |
F4 F6 |
5820K i7-6850K |
Unspecified multi-threaded problem. Reference Freeze on Test 2 in parallel mode Reference |
| ASUS M5A97 R2.0 | ? | AMD FX-8350 | Freeze on Sequential and Round Robin. Timeout and Errors in Parallel Mode Reference Unofficial BIOS fix from ASUS |
| Asus M5A97 Evo R2.0 | 2603 | AMD FX-8300 | Freeze on Sequential and Round Robin. Timeout and Errors in Parallel Mode Reference Unofficial BIOS fix from ASUS |
| ASUS M5A99FX PRO R2.0 | 2501 | AMD FX-8370 | Freeze on MP test on startup |
| ASUS 970 PRO GAMING/AURA | 0501 | AMD FX-8320E | Crash in Parallel Mode Official BIOS fix from ASUS |
| Asus X99-A II | 0601 | Intel i7-6850K | Crash in Parallel Mode. Single, Sequential and Round Robin OK Official BIOS fix from ASUS |
| Asus X99-A/USB 3.1 | ? | Intel Core i7-5930K | Freeze during Parallel Mode. MP test passed during startup Official BIOS fix from ASUS |
| ASUS X99-E WS | ? | Intel Xeon E5-2630 v4 | Freeze on Sequential, Round Robin and Parallel Mode. Single CPU Test OK |
| ASUS Strix X99 Gaming | 1401 | Intel Core i7-6800K | Freeze on multiprocessor test on startup Reference Official BIOS fix from ASUS |
| ASUS ROG STRIX X99 GAMING | 0801 | Intel Core i7 for LGA 2011-v3 | Freeze on Sequential, Round Robin and Parallel Mode. Single CPU Test OK Reference Official BIOS fix from ASUS |
| ASUS SABERTOOTH X99 | 3301 | Intel i7-5820K | Freeze on Sequential, Round Robin and Parallel Mode. Single CPU Test OK Reference Official BIOS fix from ASUS |
| ASUS X99-DELUXE II | 1504 | Intel Core i7-6950X | Freeze on Sequential, Round Robin and Parallel Mode. Single CPU Test OK Official BIOS fix from ASUS |
| ASUS X99-DELUXE | 3505 | Intel Core i7-5930K | Freeze on Sequential, Round Robin and Parallel Mode. Single CPU Test OK Official BIOS fix from ASUS |
| ASUS RAMPAGE V EXTREME | 3402 | Intel Core i7-5960X | Failed multiprocessor test on startup Freeze on parallel, sequential, round robin. No problem in Single CPU. Reference BIOS fixed in release 3701 - 2017/06/09 |
| ASUS ROG Rampage V Edition 10 | 1003 | Intel Core i7-6950X | Freeze on Sequential, Round Robin and Parallel Mode. Single CPU Test OK Reference Official BIOS fix from ASUS |
| Asus Z10PE-D8 WS | ? | ? | Freeze during Parallel Mode. MP test passed during startup |
| ASUS MAXIMUS VIII RANGER | 3007 | Intel Core i7-6700K | Single-core and all-cores tests run with no problems Freeze on Sequential, Round Robin. Reference |
| ASUS PRIME B350-PLUS | 0503 0513 0605 (Beta) |
AMD Ryzen 7 1700 Eight-Core | Freeze during multiprocessor initialization (EnableDisableAP) Reference |
| ASUS CROSSHAIR VI HERO | 1107 | AMD Ryzen 7 1800X | Freeze during multiprocessor initialization (EnableDisableAP) Official BIOS fix from ASUS |
| ASUS ROG STRIX X370-F GAMING | 0902 | AMD Ryzen 7 1700 | Freeze during multiprocessor initialization (EnableDisableAP) (Update: Appears to be fixed in version 4012) |
| Supermicro X9DRW-iF | R3.2 | Intel Xeon E5-2680 V2 | Freeze on Sequential and Round Robin. Reset on Parallel Mode. Single CPU Test OK |
| Supermicro X9DRW-3LN4F+/X9DRW-3TF+ | 1.20 | Intel Xeon E5-2640 | Failed multiprocessor test on startup Reference |
| Supermicro X9SRL-F | ? | Intel Xeon E5-2670 v2 | Hangs on AP test on startup Reference |
| Supermicro X9SRA//X9SRA-3 | R 3.2 | Intel Xeon E5-1620 | PC shuts down and reboot after "Testing multiprocessor support" Reference |
| Supermicro X10SRA/X10SRA-F | 2.0c (25th Sep 2017) | Intel Xeon E5 2630 V3 | Hangs at startup unless single threaded. Reference (Update: See top of thread for possible fix from Supermicro) |
| Supermicro C7X99-OCE/C7X99-OCE-F | 2.1a | Hangs in parallel mode from Test 2 (Update: See top of thread for possible fix from Supermicro) |
|
| Supermicro H12SSW-NT & H11DSU-iN | 1.01 | AMD EPYC 7812, 7302 | Fails to start CPU X error message (Update: Can maybe disable AMD's SMT (hyper threading) in BIOS to work around the BIOS bug) |
| EVGA X99 FTW K | 2.02 | Intel Core i7-6800K | Hangs on AP test on startup |
| MSI X399 SLI PLUS | 7B09vA6 | AMD Threadripper 1950X | Freezes in parallel mode on test 3 (Own address, Parallel) Reference |