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Hi Darren, Many thanks for the quick response. I am at the model estimating stage using spm2, even with 15 subjects (-albeit 444vols/subject), I get the notorious memory error. Would a 64bit/8GB work for sure? Also, if I re-run the model estimation is SPM5, is it going to be any easier (assuming I pre-process my data in SPM5)? best wishes, Arshad On Mon, 8 Sep 2008, Darren Gitelman wrote: > Hi Arshad > > I don't think you will be able to do this with less than a 64 bit machine > and 8 gb ram if you want to analyze them all together (i.e., a big fixed > effects analysis). However, with 30 subjects I would think you would have > sufficient numbers to perform a random effects analysis, in which case each > subject could be analyzed separately and that should certainly work. > > regards, > darren > > On Mon, Sep 8, 2008 at 11:43 AM, Dr A. Zaman <[log in to unmask]> wrote: > >> Dear SPM experts, >> >> I was wondering if anyone can suggest approx. how much >> RAM is needed in order to model fMRI data consisting >> of 30 subjects, 8 conditions, 444 (3mm/isotropic) volumes? >> I have used a pc with 4GB RAM with no joy, could not even run >> half the number of subjects. Prior to getting hold of an 8GB >> machine, can I cam sure that it will work? Any comments will be greatly >> appreciated. >> >> Many thanks, >> >> Arshad >> >> >> *********************************************************/ >> >> Dr. A Zaman, >> Clinical Sciences Centre, >> University Hospital Aintree, >> Lower Lane, >> Liverpool, UK. >> L9 7AL. >> >> *********************************************************/ >> > > > > -- > ----- > Darren Gitelman >