Can I identify my RAM without shutting down Linux?

I'd like to price some new RAM for our in-house VMware testing server. It's a consumer box we use for testing our software on and running business VMs. I've forgotten what kind of RAM it has and I'd rather not reboot the machine and fire up memtest86+ just to get the specs of the RAM. Is there any way I can know what kind of RAM to buy without shutting down Linux and kicking everyone off? For example, is the information somewhere in /proc?