Dear All, I would really appreciate your input on this matter - we bought a new 2X2.4Ghz dual quad core xeon processor mac pro - it came with 6 GBs memory but I did not realize that Apple sent 6*1 GB cards instead of 1*6 GB card. In any case, we bought 3*GB cards from an external vendor but realized that while these cards were compatible with the machine, they were not compatible with the other cards (ie. the machine would not start up when all were together). The machine has 8 memory slots in total so we just decided to remove the 6*1GB and replace with the 3*8GB cards (though, ideally, we would like as much memory in it as possible). We placed the 3*8 GB cards all on one side....I understand that some configurations better help the computer use all the memory. I am not sure if something is wrong with our current configuration but I am currently running some memory intense bioinformatics and my activity monitor says that only 3.66 GB memory being used, 7.65 inactive, 1.1 wired and 11.57 free. 100% of the processor is being used by this program. I am confused as to how to ensure that the 24GB memory is being maximally used as I believe my programs will run a lot faster if they were.... any thoughts would be much appreciated! Thanks a lot!