Yeah, it's 9.3.15, its the required version for the main software I want to use, but I can try a later version if this doesn't end up working.
For some reason I can't find sysctl ANYWHERE on this system, but just looking at the values in /proc/sys/kernel I get:
shmmni: 4096
shmmax: 18446744073692774399
shmall: 18446744073692774399
I'm guessing it might be odd that shmmax and shmall are the same size?