finding out memory modules for multiple pcs

hello to all first post and hopefully a nice greeting and answer

we have 600 pc’s which we would like to upgrade to 1gb of memory simple you say hmm yeah, problem i have i need to find out what the machine have as memory module to be able to purchase the correct amount. pc consist of at present

512mb= 2x 256mb
or
512mb= 2×128 + 1 x256

so you can see hwy i need to know what modules are in the pc’s all the 128mb will be ditched and new 256mb purchased to fill th 4 slots

SIW and BELARC do a fantastic job if you have the time and patience to go around every pc but i dont. reall y could do with this automated

we have SMS but again this will only give us a total quantity not individule memory module sizes

and help much appreciated