Question After upgrading ram different bsods issue

Jun 10, 2019
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Initially in my machine 1 GB ram was there.i upgraded to 2 GB (1+2).couple of months works fine.but I Change Os after that BSODs like kmode ,memory management,page fault in non paged area are coming.and restart in loop.but after 5 7 time.but problem is when I use using 2 of stick together problem is coming.when individually not a single time face any issue.now I bought 2 + 2 some time it's working fine here also individually no issue. but some time exception are coming if i put both.did memory check.evry thing is fine.both frequency also same.and it worked together with out any problem 7 8 moths also.guid what should I do.