<html><head></head><body><div class="yahoo-style-wrap" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><div dir="ltr" data-setdir="false">The Rough Guide to MBUS modules suggests that cache controller MXCC major versions should be matched when using two mbus modules. My SM71 is version 4.5, so I would need another of that specific version of SM71, or any SM81 to follow the Rough Guide advice. Does anyone have experience mixing 3.x and 4.x versions? <br></div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">mike<br></div></div></body></html>