After I bought a new MacBook Pro 2011 with 4 GB or RAM at 1333 MHz I decided to switch the RAM with the one from the old MacMini 8 Gb at 1066 MHz.
Initially I was expecting to have problems with the MacBook Pro, but it seem to have no problems running with 8GB of RAM at 1066 MHz.
Still, the surprise came form MacMini which became unstable and unusable (crashes or stops randomly but very often). I am wondering if the RAM is the issue or something else, like cooling.
How can I easily detect the source of the problems with the macMini? I mention that the 1333 Mhz worked just fine in the MacBook Pro and I know that it should have no problem using it, theoretically.