Finally figured out the mod using Presler and CedarMill processors. You have to insulate BSEL1 with tape and then make trace from BSEL2 to BSEL1 (the trace will be on top of the tape).
The screen shot below is from a Precision 390. Had to boost the voltage up to 1.4v. Also, Prime95 didn't fail - I ended up stopping it.
The screen shot below is from a Precision 390. Had to boost the voltage up to 1.4v. Also, Prime95 didn't fail - I ended up stopping it.