I swapped out the two old sticks and installed the new sticks, everything went fine until I got a MEMORY_MANAGEMENT BSOD many hours later. Today I got the BSODs again - it occurs pretty randomly with long intervals in-between.
A whole bunch of errors! The tests returned 0 errors up till test #6, moving inversions 32 bit patterns, and after that every single test returned an error. I let it run for a little bit more, and then decided to stop when it hit 4,350,000 errors.
Am I unlucky enough to get a bad stick(s), or is there something I'm doing herp derp retarded? The laptop ran fine 100% of the time beforehand. I haven't tested the other 4gb stick yet.