How is Memtest complexity of different pass number

[ligezhaoxin]

Hi,

I use Memtest v7.4 pro do dram test. config NUMPASS = 4. And it PASS 2/4，but fail at the 3rd and 4th iteration test.
1. whether the complexity of different test number is different? if yes, how is the law? the complexity increase with the test number? 4th iteration test > 3rd iteration test>2nd iteration test>1st iteration test??
2. can I do the 4th round test first without do 1st and 2nd test?

thanks

[David (PassMark)]

The 1st pass is a quicker pass.
All others are slightly slower.

Bur for some of the tests random data is used. So pass 2 and 3 won't be identical.