I tested my RAM using Memtest86+ last night and this was my first time using version 5.01. There is one thing I would like to note about this release.
It seems there is a bug with v5.01 with regards to the newly introduced Multi-Core (SMT) testing. This is a feature designed to dramatically speed up test times by using all the cores of the CPU. Normally, memtest86+ only uses a single core, which makes it quite slow. By using the many cores available in modern processors it can cut this time.
To enable this SMT mode, press the
F2 key within a few seconds of booting into Memtest. If you do not press this, Memtest will resort to 'Fail-Safe' mode, where it will work the same as it always has.
However, this new feature has an issue. It seems to crash whilst performing Test #7. Whilst this doesn't affect all systems, users are reporting it to affect quite a few. There are a few posts on the memtest forum:
5.01 freezes -
fleapickle said:
CPU: Intel Ivybridge 3570k 3.4Ghz
RAM: Mushkin 996995 8GB
Motherboard: Z77A-G43
Firstly am I supposed to force SMT? Memtest86+ seems to think my PC is single core otherwise.
Secondly, after choosing SMT, the test freezes less than two minutes in. The few blinking symbols on-screen keep blinking, but the timer freezes, and the program doesn't respond to keypresses...
In case this is important: I installed MT86+ to USB from my Windows 8.1 computer using the installer.
norwoods said:
I have 2 servers: Intel Xeon E3-1220 V2, SuperMicro X9SCI-LN4F, SuperTalent 2x8GB DDR3-1600 ECC and Intel Xeon E3-1220 V3, SuperMicro X10SLM-LN4F, SuperTalent 4x8GB DDR3-1600 ECC. When I press F2 to get SMP mode the systems freeze in Test 7 about 20% to 25% through the test doing a Block Move of 4096M-6144M. Things seem fine with SMP Disabled.
norwoods said:
When I press F3 to get SMP mode the Intel Xeon E3-1220 V2 gets past Test 7 but the Intel Xeon E3-1220 V3 does not.
Inky said:
CPU: i5 750 @ 2.88 GHz
RAM: G. Skill Sniper 9-9-9-28 @ 1805 MHz, 1.45V
Mobo: Asus P7P55D EVO
With SMT disabled, it passes all the tests.
With SMT enabled, the tests proceed at warp speed and freeze at Step 7, just like norwoods above.
If I use 5.00 RC1, SMT works fine.
And so on and so forth...
Memtest86+ is freezing while running test #7
memtest86+ 5.01 shutdown w forced multithread around start of test 7
False positives given whilst running in SMT -
v5.01 gives errors in multi thread mode, but not in default mode
So I recommend
NOT using SMP mode until a fix is made. Just let Memtest run as normal.
Stephen