Failure always in the same bit!

Hi! Windows was working fine after finishing my first PC build (which I finished yesterday), until I got a blue crash screen with "MEMORY_MANAGEMENT" error.
After running memtest86 a few times, I noticed that the failures are always in the same bit, with the value 4 as difference:

- Expected: 10000000, Actual: 10000400
- Expected: FF7FFFFF, Actual: FF7FFBFF
- Expected: 00000002, Actual: 00000402

What does this mean? Is it surely the RAM's fault? Should I return it?

Summary

Report Date	2017-03-14 09:54:43
Generated by	MemTest86 V7.3 Free (64-bit)
Result	FAIL

System Information

EFI Specifications	2.50
System
Manufacturer	Gigabyte Technology Co., Ltd.
Product Name	Z270-HD3P
Version	Default string
Serial Number	Default string
BIOS
Vendor	American Megatrends Inc.
Version	F2
Release Date	11/25/2016
Baseboard
Manufacturer	Gigabyte Technology Co., Ltd.
Product Name	Z270-HD3P-CF
Version	x.x
Serial Number	Default string
CPU Type	Intel Core i7-7700K @ 4.20GHz
CPU Clock	4201 MHz [Turbo: 4501.2 MHz]
# Logical Processors	8 (4 enabled for testing)
L1 Cache	4 x 64K (285432 MB/s)
L2 Cache	4 x 256K (124595 MB/s)
L3 Cache	8192K (67735 MB/s)
Memory	8256M (21623 MB/s)
DIMM Slot #0	4GB DDR4 PC4-17000
	04CD / F4-2400C15-4GVR
	2133 MHz
DIMM Slot #1	4GB DDR4 PC4-17000
	04CD / F4-2400C15-4GVR
	2133 MHz

Result summary

Test Start Time	2017-03-14 08:11:17
Elapsed Time	1:40:51
Memory Range Tested	0x0 - 22F000000 (8944MB)
CPU Selection Mode	Parallel (All CPUs)
# Tests Passed	34/48 (70%)

Lowest Error Address	0x17820966C (6018MB)
Highest Error Address	0x17FFBFDAC (6143MB)
Bits in Error Mask	0000000000000400
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]	1/4 (25%)	7
Test 4 [Moving inversions, 8-bit pattern]	1/4 (25%)	14
Test 5 [Moving inversions, random pattern]	0/4 (0%)	13
Test 6 [Block move, 64-byte blocks]	4/4 (100%)	0
Test 7 [Moving inversions, 32-bit pattern]	0/4 (0%)	40
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]	4/4 (100%)	0

Last 10 Errors

[Data Error] Test: 7, CPU: 0, Address: 17FFB8A2C, Expected: 10000000, Actual: 10000400

[Data Error] Test: 7, CPU: 6, Address: 17BF2DDAC, Expected: 00080000, Actual: 00080400

[Data Error] Test: 7, CPU: 6, Address: 17BF2DDEC, Expected: 00000008, Actual: 00000408

[Data Error] Test: 7, CPU: 6, Address: 17BF2DEEC, Expected: 00000008, Actual: 00000408

[Data Error] Test: 7, CPU: 6, Address: 17BFBFAEC, Expected: 00000002, Actual: 00000402

[Data Error] Test: 7, CPU: 0, Address: 17C045FEC, Expected: 01000000, Actual: 01000400

[Data Error] Test: 7, CPU: 0, Address: 17C045FAC, Expected: 00000100, Actual: 00000500

[Data Error] Test: 7, CPU: 6, Address: 17BFBD0EC, Expected: FF7FFFFF, Actual: FF7FFBFF

[Data Error] Test: 7, CPU: 0, Address: 17C044EEC, Expected: 00001000, Actual: 00001400

[Data Error] Test: 7, CPU: 0, Address: 17C044EAC, Expected: 10000000, Actual: 10000400

Certification

This document certifies that the Tests described above have been carried out by a suitably qualified technician on the System described above.

Signed

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