Memtest86 results - RAM or something worse?

Hey everyone (or just David),

I'm on a computer I built myself about a year ago. About 5 or 6 months ago, the computer restarted randomly while I was sleeping with no significant hardware, software or firmware changes. Looking in event viewer, it recovered from a bugfix, which I guess was a bluescreen. It happened about five hours later on that day, and so I ran windows memory diagnostic. It detected an error, so I downloaded and installed memtest86 -- and ran it for 2x4 passes (since free version). It turned up no errors, then I ran the windows memory diagnostic again and it didn't turn up errors again. It didn't happen for months afterwards, so I hoped to chalk it up to some anomaly memory reference but about a month ago, it happened again, then happened once a week and now it's a pretty regular occurence.

I ran memtest yesterday and it turned up 30 errors within the first 3 tests. It ended the 4th pass with about 120 errors (I forgot to save results, but I uploaded the portion from memtest86.log: https://1drv.ms/t/s!AvGbBVfnZ4wQgQCD...9EXCe?e=0WnXTn ). I updated my BIOS and reverted all settings to default, which led to this test: Summary

Report Date	2019-12-21 15:18:17
Generated by	MemTest86 V8.2 Free (64-bit)
Result	FAIL

System Information

EFI Specifications	2.70
System
Manufacturer	System manufacturer
Product Name	System Product Name
Version	System Version
Serial Number	System Serial Number
BIOS
Vendor	American Megatrends Inc.
Version	1401
Release Date	11/26/2019
Baseboard
Manufacturer	ASUSTeK COMPUTER INC.
Product Name	ROG STRIX Z390-F GAMING
Version	Rev 1.xx
Serial Number	181038357700054
CPU Type	Intel Core i9-9900K @ 3.60GHz
CPU Clock	3646 MHz [Turbo: 4820.2 MHz]
# Logical Processors	16 (8 enabled for testing)
L1 Cache	4 x 64K (194024 MB/s)
L2 Cache	4 x 256K (84680 MB/s)
L3 Cache	16384K (39922 MB/s)
Memory	16314M (17411 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

Result summary

Test Start Time	2019-12-21 12:14:01
Elapsed Time	3:03:50
Memory Range Tested	0x0 - 46E000000 (18144MB)
CPU Selection Mode	Parallel (All CPUs)
ECC Polling	Enabled
# Tests Passed	45/48 (93%)

Lowest Error Address	0x43FB25E78 (17403MB)
Highest Error Address	0x4499208D0 (17561MB)
Bits in Error Mask	0000000000004100
Bits in Error	2
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]	2/4 (50%)	2
Test 8 [Random number sequence]	4/4 (100%)	0
Test 9 [Modulo 20, ones & zeros]	3/4 (75%)	1
Test 10 [Bit fade test, 2 patterns, 1 CPU]	4/4 (100%)	0
Test 13 [Hammer test]	4/4 (100%)	0

Last 10 Errors

2019-12-21 14:56:29 - [Data Error] Test: 9, CPU: 0, Address: 43FB25E78, Expected: BFA8FF17, Actual: BFA8FE17

2019-12-21 14:46:05 - [Data Error] Test: 7, CPU: 4, Address: 447921EE8, Expected: FFFDFFFF, Actual: FFFDBFFF

2019-12-21 12:21:45 - [Data Error] Test: 7, CPU: 6, Address: 4499208D0, Expected: 00000080, Actual: 00004080

Memtest86 results - RAM or something worse?

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Memtest86 results - RAM or something worse?