One error on run 4 [in Test 7] in MemTest86, is it scary and what to do?

Question

Iron

Hello experts!
Just an hour ago, the 7-hour test of my RAM ended.
Tested with MemTest86 V8.0 Pro (64-bit) .
The program revealed 1 error in Test 7 after 4 passes (at the 5th hour of testing):

Test -- #Tests Passed -- Errors
Test 7 [Moving inversions, 32-bit pattern] -- 3/4 -- (75%) -- 1

At the end of 18 he assembled a new car

• Ryzen 5 2600X,
  
• Asus Tuf x470 plus,
  
• RX580 Nitro+
  
• and 32GB of memory from Kingston 4 dies of 8 GB, 3200Mhz
  

I took 2 sets of 16GB dies at different times and from different companies (Xcom SPB and Yulmart), but I specially selected them so that the manufacturer's codes matched. By the way, the plates differ only in color - white and black.
Kingston HX432C18 FW 2K2/16 - white (Xcom SPB).
Kingston HX432C18 FB 2K2/16 - black (Yulmart).
At the time of replacing the hardware, the old Windows 10 Pro 1809 (17763.292) did not reinstall, just reconnected the SSD to the new mother and enjoyed life. At some point, games started crashing silently, without warning or notification (BF4, FarCry, Battlerite + Manion Masters → Unity 3d games).
Digging through the Windows Event Log, I found the constantly mentioned error code 0xc0000005 .
In working programs, such as Photoshop, Axure RP, Word 365, and even more so usually surfing on 50+ tabs + youtube, the problem does not appear and does not interfere with work.
However, I decided to check the memory and here is the result:

Test Start Time 2019-02-01 05:23:44
Elapsed Time 7:10:58
Memory Range Tested 0x0 - 81F380000 (33267MB)
CPU Selection Mode Parallel (All CPUs)
ECC Polling Enabled
# Tests Passed 55/56 (98%)

Lowest Error Address 0x271E85104 (10014MB)
Highest Error Address 0x271E85104 (10014MB)
Bits in Error Mask 0000000080000000
Bits in Error 1
Max Contiguous Errors 1

2019-02-01 10:55:46 - [Data Error] Test: 7, CPU: 9, Address: 271E85104, Expected: 20000000, Actual: A0000000

PC Configuration and Memory Specification

EFI Specifications 2.60
BIOS
Vendor American Megatrends Inc.
Version 4207
Release Date 12/08/2018
Baseboard
Manufacturer ASUSTeK COMPUTER INC.
Product Name TUF X470-PLUS GAMING
Version Rev X.0x
CPU Type AMD Ryzen 5 2600X Six-Core
CPU Clock 3615 MHz [Turbo: 4242.9 MHz]
# Logical Processors 12
L1 Cache 12 x 96K (84153 MB/s)
L2 Cache 12 x 512K (81128 MB/s)
L3 Cache 1 x 16384K (32276 MB/s)
- - -
Memory 32713M (19622 MB/s)
DIMM Slot #0 8GB DDR4 XMP PC4-25600
Kingston / KHX3200C18D4/8G / 0F02A03A
18-21-21-39 / 3200 MHz / 1.200V
DIMM Slot #1 8GB DDR4 XMP PC4-25600
Kingston / KHX3200C18D4/8G / 543F927D
18-21-21-39 / 3200 MHz / 1.200V
DIMM Slot #2 8GB DDR4 XMP PC4-25600
Kingston / KHX3200C18D4/8G / 4F165326
18-21-21-39 / 3200 MHz / 1.200V
DIMM Slot #3 8GB DDR4 XMP PC4-25600
Kingston / KHX3200C18D4/8G / 4F165726
18-21-21-39 / 3200 MHz / 1.200V

- - -
Actually, questions:

1. How critical is this error, in the sense that it appeared once in the last run?
   Could it be... I don't know, random error?
   
2. Is it possible to somehow localize the problem, is there a chance that after reinstalling Windows from scratch, the problem will disappear?
   
3. How to more effectively identify a “broken” plate or will you have to run it from time to time, taking out the plates one by one?
   

- - -

Answer 1

The problem is solved: I changed the kit under warranty (Yulmart), bought a similar new one (Onlinetrade). The problem is no longer seen. As a result - the marriage of the kit.

Answer 2

1. If you are not afraid of absolutely incomprehensible computer glitches and loss of information, then, of course, it is not critical.
2. There is no chance, hardware problems are not solved by reinstalling Windows.
3. Run one at a time, then, if nothing is found, then in various combinations. In addition, each test is carried out for a long time (up to a day) or until an error is detected.

Answer 3

it is not critical it is
unlikely
to pull out one at a time
if the problems are only in games it is logical to sin on the vidyuhi, try another

Answer 4

It will be much easier and faster to completely replace the memory. You are tormented now, 100%. Post how it went.