@mhtaylor said:
...I can't get SU to take more than half the 8gb I have installed...
LAA will not use as much RAM as you have on a 64 bit system just up to 4 Gb (and that seems to work for you). If LAA weren't there, it could only use 2 Gb (or with some hack, even on a 32 bit system, 3Gb but it may not be stable)