arnie 

Never noticed that when Sierra is loading the charts it makes my CPU go to 100%. Multicharts and IRT rarely move my CPU above 50% when loading them.

Yup, Sierra is much better at multi-threading.

Well hopefully everything is solved now, in the end.

Mike

So SC saw 8G but when it tried to use 8G it couldn't (now it does) and crashed the computer?

cory 

So SC saw 8G but when it tried to use 8G it couldn't (now it does) and crashed the computer?

Well, to tell you the truth I'm clueless at this point.

So the computer spent almost 11 hours testing the RAM using Prime95 and not a single error was found. Sierra is opening fine now. Just opened 4 chartbooks at the same time with more than 20 charts and everything loaded smoothly.

The only thing I did was remove all DIMMs from the slots, tested 1 by one, connect the 4 once again, most certainly changing the order and all seems to work fine now.

One of those things that it's impossible to explain

I want to thanks all you guys for helping me during these couple of days.
I hope I can retribute one day.

Regards