your fine. your generally correct, depending on the manufacturer of the psu about the 12volt rail.
now if you cpu draws 95 watts under full load and hard drives and dvd pull 5-10 watts max you memory is just a few. your talking about 120 watts which is just 10 amps. so that leaves 28 amps on the 12v1 rail.
btw, that 38 and 38 is not a combined load of 72 it is the maximum of EACH rail individually.
the combined load seems to be 48 amps:http://www.kitguru.net/components/power-supplies/zardon/antec-earthwatts-ea-650w-review-green-2011/4/