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Always in the first slot advised by the motherboard manufacturer: it's usually the second slot, starting from the CPU). If you are still unsure, you could try the test on each stick at once (i.e., if you have got 4 sticks/slots, one stick at a time, then another stick, then another stick, then the last stick. test mix extended, cache on, 15 pass counts. To ensure the test is accurate enough, you should use the maximum values, i.e.
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You can go to the other options pressing TAB (key on your keyboard). You can change the options of the tool pressing F1 (key on your keyboard).
MEMORY DIAG FOR WIN 10 WINDOWS
After you restart/reboot your machine, the windows memory diagnostic tool will be directly loaded." Check for problems the next time I start my computer."