The boards need to be 1.27mm thick. The original spec. is for .050", which is 1.27mm. There's some +/- in that spec, but really not enough to go to 1.2 or up to 1.6.Well my first ones were 1.6mm, but they are WAYYY too hard to get in/out of the socket. I basically had to wriggle it back and forth multiple times for it to fit in the socket and getting it out felt like I was going to rip the whole board with it. I measured the original ram I have here and it's around 1.2mm, but if it needs to be a little bigger, then I'll do some tricks I guess heh.