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#31
As per the "Part 3: If you have errors" of How to Test and Diagnose RAM Issues with Memtest86+ first run it with all the existing/installed RAM modules. If it comes with no error, all is good.
But if it starts showing errors, Stop testing. Errors/red lines means one or more RAM is faulty. But the fault may occur due to a faulty DIMM slot, too, which is a motherboard component. Using memtest86+, you can discriminate between a faulty RAM and a faulty motherboard.
How? Say you have two RAM sticks and two DIMM slots. You obtained errors at the test with all RAM sticks installed. Now, remove all the sticks but one. Test it in all the available slots, one by one. Continue the same procedure for all the available sticks and DIMM slots.
How to make the inference that is it a RAM issue or it is a motherboard issue? Suppose you have got the result like that:
No code has to be inserted here. It is a RAM, a bad RAM.
But if you have got a result like that:
No code has to be inserted here. It is a motherboard issue. The particular slot is bad.
As you have system constraints, test A1, B1 and C1 individually first, with all the RAM sticks one by one. if you get any error for those, determine that slot as bad, but if all are OK, it is all good.
Now, take a RAM module say RAM1, which is good with all the slots, and RAM2 which is similarly good. Put one of them in A1 which is good too. Put another one in A2 which is not tested yet. This time memtest showed errors. So we may have a hint that A2 is a failing slot.
Shuffle the RAM modules in slots and test again; error again. Decide that A2 is really bad.
Due to the constraints, the memtest process will take a long time, but the result you will get will be worthy.