I can say that we have a Solution running with 14 websites and 70 editors in the same C1 installation. The main site is http://www.dhf.dk/ and then it has all its branches.
The server is a 4 core Windows 2008 R2 machine with 4 gb memory. There are about 10.000 pages and 20.000 media files running on a SQL server. So i can say C1 scales very well, but as a thumbrule it will consume all the memory you'll throw after it and the more the better.
The server is a 4 core Windows 2008 R2 machine with 4 gb memory. There are about 10.000 pages and 20.000 media files running on a SQL server. So i can say C1 scales very well, but as a thumbrule it will consume all the memory you'll throw after it and the more the better.