AMS ec2 connection limits

Hi

I'm getting conflicting information about AMS ec2 connection limits.  One source says that it is limited by some set rule, another by the hardware available.

via: http://help.adobe.com/en_US/flashmediaserver/amazonec2/flashmediaserver_4.5_amazonec2.pdf

"Flash Media Server on Amazon Web Services limits the number of simultaneous RTMFP connections based on the

size of the AMI instance. The following table lists the number of simultaneous RTMFP connections allowed for each

AMI instance type:"

via: http://forums.adobe.com/message/2742646

"There is not limit to concurrent connections or streams as far a the license goes.... the FMS license is per machine, so you just need a license for each machine you install on."

How can I actually prediect what my large box will be able to handle?

Thanks,

--Peter