Hi Adrian :-)
If I remember well, Cyberstorm MKI memory module needs four identical simms or two different pair of identical simms to works.
60ns FPM ram is prefered.
when using two pairs you must insert the simms in not adjacent simm slots or the card will not recognise the memory. same if you use two different sized pairs of simms, the bigger one needs to be in slot 0 and 3, the smaller one in 2 and 4.
Is this help?