Random Reboot without BSOD, Memtest Fails Hammer Test

majarman · 25 Mar 2015

EDIT: Here's the Memtest86.log file: Memtest86.log - Pastebin.com

I have been having a few issues with my custom build recently. I have noticed my computer randomly rebooting after being idle for a while, but it hardly ever does this during use (still hasn't). It also hangs a little more frequently. It never used to do this before, but I suspect memory faults?

I don't remember if this started happening before or after I enabled XMP in my BIOS.

What should I be looking at? I disabled XMP but the rebooting issue and memtest failures persist.

Thank you for any help you can offer. It's much appreciated!

Here is the memtest86 report (if I need to post something else, let me know):

Summary

Report Date 2015-03-25 10:17:58
Generated by MemTest86 V6.0.0 Free (64-bit)
Result FAIL
System Information

EFI Specifications 2.31
CPU Type Intel Core i7-4790 @ 3.60GHz
CPU Clock 3600 MHz [Turbo: 4000.1 MHz]
# Logical Processors 8
L1 Cache 64K (160451 MB/s)
L2 Cache 256K (60858 MB/s)
L3 Cache 8192K (45488 MB/s)
Memory 8239M (18062 MB/s)
DIMM Slot #0 4GB DDR3 XMP PC3-12800
Corsair / CML8GX3M2A1600C9
9-9-9-24 / 800 MHz / 1.500V
DIMM Slot #1 4GB DDR3 XMP PC3-12800
Corsair / CML8GX3M2A1600C9
9-9-9-24 / 800 MHz / 1.500V
Result summary

Test Start Time 2015-03-25 01:00:28
Elapsed Time 6:10:01
Memory Range Tested 0x0 - 22FE00000 (8958MB)
CPU Selection Mode Single: CPU # 0
# Tests Passed 44/48 (91%)
Lowest Error Address 0x21C4470AC (8644MB)
Highest Error Address 0x21C4470AC (8644MB)
Bits in Error Mask 0000000000020000
Bits in Error 1
Max Contiguous Errors 1
Test # Tests Passed Errors
Test 0 [Address test, walking ones, 1 CPU] 4/4 (100%) 0
Test 1 [Address test, own address, 1 CPU] 4/4 (100%) 0
Test 2 [Address test, own address] 4/4 (100%) 0
Test 3 [Moving inversions, ones & zeroes] 4/4 (100%) 0
Test 4 [Moving inversions, 8-bit pattern] 4/4 (100%) 0
Test 5 [Moving inversions, random pattern] 4/4 (100%) 0
Test 6 [Block move, 64-byte blocks] 4/4 (100%) 0
Test 7 [Moving inversions, 32-bit pattern] 4/4 (100%) 0
Test 8 [Random number sequence] 4/4 (100%) 0
Test 9 [Modulo 20, ones & zeros] 4/4 (100%) 0
Test 10 [Bit fade test, 2 patterns, 1 CPU] 4/4 (100%) 0
Test 13 [Hammer test] 0/4 (0%) 4
Last 10 Errors
[Data Error] Test: 13, CPU: 0, Address: 21C4470AC, Expected: 00000000, Actual: 00020000

Here are my specs, as I have them listed on my profile:
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Custom
OS
Windows 7 Home Premium 64 Bit
CPU
Intel Core i7-4790
Motherboard
Gigabyte Z97X Gaming 3
Memory
8 GB (2x4GB) Corsair Vengeance LP 1600 1.5v
Graphics Card(s)
XFX HD-687A-ZNBC (HD6870 black edition 1GB)
Sound Card
N/A
Monitor(s) Displays
N/A
Screen Resolution
1920x1080
Hard Drives
Samsung 840 EVO 250 GB SSD
WD Purple 2.0 TB HDD
PSU
750 Watt

Gator · 25 Mar 2015

Upon any failures with memory you have either bad memory or a bad memory controller.

You can find out which one it might be by using the link below:
RAM - Test with Memtest86+

Also of help, below is something one of our members Arc posted a while ago.

BSOD at random times, driver problem 99,9% likely

carwiz · 25 Mar 2015

Follow the procedure in Part 3 of this tutorial: RAM - Test with Memtest86+

It will help determine which module or slot is bad. The bad module(s) will have to be replaced. There is no way to repair memory errors. Your model carries a lifetime warranty so other than the inconvenience, it shouldn't be too painful.

carwiz · 25 Mar 2015

There's an echo in here.... here..... here.

I guess I should have refreshed the page.

Gator · 25 Mar 2015

carwiz said:

There's an echo in here.... here..... here.

I guess I should have refreshed the page.

Its ok, great minds think alike

majarman · 26 Mar 2015

So I ran the tests, and something interesting happens. When I ran the tests initially, it always failed exactly once in the same way in test 13, the hammer test, with a single 1 bit error. When I tested the sticks one at a time, in each slot, they worked perfectly. The only way to reproduce the error is by testing them both simultaneously.

Boozad · 26 Mar 2015

Are you using MemTest86+ or just MemTest86? There's a big difference.

majarman · 26 Mar 2015

Memtest86-6.0.0.iso that I'm running off a bootable flash drive, extracted using Rufus if that means anything.

carwiz · 27 Mar 2015

Strange. Here's what I see when I go to the download page.

Boozad · 27 Mar 2015

He's using this Ken.

Random Reboot without BSOD, Memtest Fails Hammer Test-capture.jpg

Once more for the OP as you seem to have misread the links provided above, or not read them at all.

Download and run MemTest86+ to test your RAM. RAM - Test with Memtest86+

Note

Run MemTest86+ for at least 8 passes. Ideally set it off before you go to bed and leave it overnight, we're looking for zero errors here. A single error will show something's going bad with your RAM.