No, I'm not. It is just based on people's experience. LinX does stress memory and detect serious memory errors but Prime and especially MemTest are believed to be much more sensitive to memory instability.

Residual errors are indication of CPU instability too. When the wrong residual is close to others (correct ones) it is normally a CPU fault. Big difference in residuals often indicates memory or NB issues. At least this is what was observed on Core 2s.

As a side note, 64-bit Linpack often causes BSODs on my E8500. Where 32-bit version always has wrong residuals, 64-bit one would sometimes BSOD.