I got 1 error, What does it mean? (thank you)

[3BB65253C]

My PC is not fast as it use to be
summary

Report Date	2019-05-30 20:19:35
Generated by	MemTest86 V8.1 Free (64-bit)
Result	FAIL

System Information

EFI Specifications	2.31
System
Manufacturer	Gigabyte Technology Co., Ltd.
Product Name	H97-D3H
Version	To be filled by O.E.M.
Serial Number	To be filled by O.E.M.
BIOS
Vendor	American Megatrends Inc.
Version	F7
Release Date	09/19/2015
Baseboard
Manufacturer	Gigabyte Technology Co., Ltd.
Product Name	H97-D3H-CF
Version	x.x
Serial Number	To be filled by O.E.M.
CPU Type	Intel Core i7-4790 @ 3.60GHz
CPU Clock	3592 MHz [Turbo: 3990.8 MHz]
# Logical Processors	8 (4 enabled for testing)
L1 Cache	4 x 64K (165374 MB/s)
L2 Cache	4 x 256K (60836 MB/s)
L3 Cache	8192K (44278 MB/s)
Memory	16267M (19618 MB/s)
DIMM Slot #0	8GB DDR3 PC3-12800
	Kingston / KHX1600C10D3/8G / 0E2893FD
	10-10-10-30 / 1600 MHz / 1.5V
DIMM Slot #1	8GB DDR3 PC3-12800
	Kingston / KHX1600C10D3/8G / 0E288BFD
	10-10-10-30 / 1600 MHz / 1.5V

Result summary

Test Start Time	2019-05-30 16:37:05
Elapsed Time	3:23:05
Memory Range Tested	0x0 - 42EE00000 (17134MB)
CPU Selection Mode	Parallel (All CPUs)
ECC Polling	Enabled
# Tests Passed	47/48 (97%)

Lowest Error Address	0x3BB65253C (15286MB)
Highest Error Address	0x3BB65253C (15286MB)
Bits in Error Mask	0000000008000000
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]	3/4 (75%)	1
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

2019-05-30 19:27:30 - [Data Error] Test: 8, CPU: 6, Address: 3BB65253C, Expected: 0CDF7D34, Actual: 04DF7D34

Certification

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

Signed

[David (PassMark)]

Might be a "Soft Error" or the RAM might be bad.

Maybe run the test again to see if you get the same error (check to see if the Bits in Error Mask is the same on the 2nd run, as if it is the same it is likely not a random fault).