What do these MemTest86 results mean?

Question

RAM

Good day!
Tested MemTest86 V9.1 Free (64-bit)
Installed 2 sticks of 8GB each
Both sticks are:

8GB DDR4 PC4-21300
AMD / R7S416G2606U2K / 00000000
2666 MHz

During the test run, I received 9 error messages of the form:

2021-06-04 13:35:35 - [Data Error] Test: 5, CPU: 4, Address: 22EA298F8, Expected: CFE64419, Actual: 6FE64419
2021-06-04 13:35:35 - [Data Error] Test : 5, CPU: 4, Address: 22EA298E8, Expected: CFE64419, Actual: 8FE64419
2021-06-04 13:35:35 - [Data Error] Test: 5, CPU: 4, Address: 22EA298E0, Expected: CFE64419, Actual : BFE64419
2021-06-04 13:35:35 - [Data Error] Test: 5, CPU: 4, Address: 22EA298C0, Expected: CFE64419, Actual: EFE64419
2021-06-04 12:21:45 - [Data Error ] Test: 9, CPU: 2, Address: 164039EE0, Expected: 0FEEF498, Actual: 5FEEF498

And the report also concludes:

Lowest Error Address 0x164039EE0 (5696MB)
Highest Error Address 0x22EA298F8 (8938MB)
Bits in Error Mask 00000000F0000000

But how critical they are, I can’t understand ..

Question 1:
As I understand it, judging by the results, there is a problem in one of the plates?
Namely - a broken section with a size of 3242MB (from 5696MB to 8938MB).

Question 2:
Dies are complete. Is it better to take them to the store?

Answer 1

Do another test of each bar separately.
Turn off the PC, pull out one bar, run MemTest86, several runs, or until errors appear.
Turn off the PC, pull out the tested bar, put another one, run MemTest86, several runs, or until errors appear.
If there are errors, move the only bar to another slot and run MemTest86 again. If there are no errors in another slot with the same bar, then it may not be the memory itself that is to blame, but the motherboard or processor.
If both one and the other bar separately do not cause errors, then it is likely that the motherboard or processor is to blame.