Random BSOD

[miciafaceri]

Thanks for the reply.

After reading the manual I found this : the four memory sockets are divided into two channels and each channel has two memory sockets as following:
Channel A: DDR4_2, DDR4_4
Channel B: DDR4_1, DDR4_3

I tested both channels without any error.

But I made another few tests and I think I found a possible damaged memory which gives errors only under certain conditions.

Case 1 - errors
Channel A: Bad Memory, good memory
Channel B: good memory, good memory

From here I made every combination to isolate the Bad memory.

Case 2 - errors
Channel A: Bad Memory
Channel B: good memory, good memory

Case 3 - errors
Channel A: good memory, good memory
Channel B: Bad Memory

What it's strange it's this :

Case 4 - No errors
Channel A: Bad Memory, good memory
Channel B: good memory

Case 5 - No errors
Channel A: good memory
Channel B: Bad Memory, good memory

Case 6 - No errors - I tested here the bad memory with each good memory and I didn't got any error.
Channel A: Bad Memory, good memory
Channel B:

Case 7 - No errors
Channel A:
Channel B: Bad Memory, good memory

Have you seen anything like this before?

[David (PassMark)]

Sometimes faults are only seen when the RAM is in dual channel mode,
So you might be better off testing them in pairs (not individually, or by 3s) using the slots required to get the RAM into dual channel mode.

[miciafaceri]

Hello everyone,

After getting lots of random BSOD in the last days I decided to test my memory with MemTest86 and I got the results :

Generated by	MemTest86 V8.3 Free (64-bit)
Result	FAIL

System Information

EFI Specifications	2.60
System
Manufacturer	Gigabyte Technology Co., Ltd.
Product Name	Z370 AORUS Gaming 5
Version	Default string
Serial Number	Default string
BIOS
Vendor	American Megatrends Inc.
Version	F5e
Release Date	01/10/2018
Baseboard
Manufacturer	Gigabyte Technology Co., Ltd.
Product Name	Z370 AORUS Gaming 5-CF
Version	x.x
Serial Number	Default string
CPU Type	Intel Core i7-8700K @ 3.70GHz
CPU Clock	3734 MHz [Turbo: 4944.9 MHz]
# Logical Processors	12 (6 enabled for testing)
L1 Cache	4 x 64K (241751 MB/s)
L2 Cache	4 x 256K (134272 MB/s)
L3 Cache	12288K (49785 MB/s)
Memory	32726M (28659 MB/s)
DIMM Slot #0	8GB DDR4 XMP PC4-23900
	Corsair / CMK16GX4M2B3000C15
	15-17-17-35 / 2998 MHz / 1.350V
DIMM Slot #1	8GB DDR4 XMP PC4-23900
	Corsair / CMK16GX4M2B3000C15
	15-17-17-35 / 2998 MHz / 1.350V
DIMM Slot #2	8GB DDR4 XMP PC4-23900
	Corsair / CMK16GX4M2B3000C15
	15-17-17-35 / 2998 MHz / 1.350V
DIMM Slot #3	8GB DDR4 XMP PC4-23900
	Corsair / CMK16GX4M2B3000C15
	15-17-17-35 / 2998 MHz / 1.350V

Result summary

Test Start Time	2020-05-07 20:21:31
Elapsed Time	0:02:12
Memory Range Tested	0x0 - 83F000000 (33776MB)
CPU Selection Mode	Parallel (All CPUs)
ECC Polling	Enabled
# Tests Passed	1/4 (25%)

Lowest Error Address	0x7FEA10180 (32746MB)
Highest Error Address	0x7FEA17E5C (32746MB)
Bits in Error Mask	0000080000000800
Bits in Error	2
Max Contiguous Errors	2

Test	# Tests Passed	Errors
Test 0 [Address test, walking ones, 1 CPU]	1/1 (100%)	0
Test 1 [Address test, own address, 1 CPU]	0/1 (0%)	278
Test 2 [Address test, own address]	0/1 (0%)	270
Test 3 [Moving inversions, ones & zeroes]	0/1 (0%)	2035
Test 4 [Moving inversions, 8-bit pattern]	0/0 (0%)	7652
Test 5 [Moving inversions, random pattern]	0/0 (0%)	0
Test 6 [Block move, 64-byte blocks]	0/0 (0%)	0
Test 7 [Moving inversions, 32-bit pattern]	0/0 (0%)	0
Test 8 [Random number sequence]	0/0 (0%)	0
Test 9 [Modulo 20, ones & zeros]	0/0 (0%)	0
Test 10 [Bit fade test, 2 patterns, 1 CPU]	0/0 (0%)	0
Test 13 [Hammer test]	0/0 (0%)	0

Last 10 Errors

2020-05-07 20:23:41 - [Data Error] Test: 4, CPU: 8, Address: 7FEA11BDC, Expected: 80808080, Actual: 80808880

2020-05-07 20:23:41 - [Data Error] Test: 4, CPU: 8, Address: 7FEA11BD4, Expected: 80808080, Actual: 80808880

2020-05-07 20:23:41 - [Data Error] Test: 4, CPU: 8, Address: 7FEA11BCC, Expected: 80808080, Actual: 80808880

2020-05-07 20:23:41 - [Data Error] Test: 4, CPU: 8, Address: 7FEA11B94, Expected: 80808080, Actual: 80808880

2020-05-07 20:23:41 - [Data Error] Test: 4, CPU: 8, Address: 7FEA11B8C, Expected: 80808080, Actual: 80808880

2020-05-07 20:23:41 - [Data Error] Test: 4, CPU: 8, Address: 7FEA11B84, Expected: 80808080, Actual: 80808880

2020-05-07 20:23:41 - [Data Error] Test: 4, CPU: 8, Address: 7FEA118CC, Expected: 80808080, Actual: 80808880

2020-05-07 20:23:41 - [Data Error] Test: 4, CPU: 8, Address: 7FEA118C4, Expected: 80808080, Actual: 80808880

2020-05-07 20:23:41 - [Data Error] Test: 4, CPU: 8, Address: 7FEA1189C, Expected: 80808080, Actual: 80808880

2020-05-07 20:23:41 - [Data Error] Test: 4, CPU: 8, Address: 7FEA1188C, Expected: 80808080, Actual: 80808880

I have 4 x 8GB Corsair DDR4 and I thought one of them might be broken and I tested them one by one in DIMM Slot 1 and I had 0 error.
Then I tested each memory in all DIMM slots (1,2,3,4) and again I had 0 errors.
Then I put back all 4 memory and test it again and I had the same errors as above.
Then I tested 3 memories at a time in the following DIMM slots (as numbered on the motherboard) :
2 - 3 - 4 = No errors
1 - 2 - 4 = No errors
1 - 3 - 4 = No errors
1 - 2 - 3 = Errors as above.

Can you help me here with an advice? What I should do next? It's the motherboard broken?

Thanks!