to silence this bane of all MXM upgraders, look here
As an attachment, here is the modified bios of my NV 9600M GT 1024MB DDR2, Hynix memory chips, green PCB. Beeps are turned off and perf. tables are modified as described in the NightWalker guide.
Update: ok, things moved forward a little bit and now we can do more about this nag screen. Look in this thread