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#141
The best testing is testing the dual channel capability of the motherboard. That is only accomplished testing 2 or more RAM at the same time.
The Memtest86+ version 5.01 takes approximately 1 - 2 hours / GB of RAM.
If you have the time to test all of the RAM at one time that is the best method.
If you need to use the computer limiting the testing time then you could test 1 RAM at a time. If the RAM pass you have ruled out the RAM as a potential problem but you have not tested the dual channel capability.
So as long as you understand the limitations of the testing whichever method you have the time to perform.