Actually, this is the most powerfull server i have: http://www.ovh.co.uk/products/eg_ssd.xml Specs:Xeon Quad Core @ 2.66Ghz12Gb of RAMSSD hard disk (Intel X25-M)Nginx webserver I have a brand new forum (so the database is almost empty), and to start it i will pay to get adversided on a very popular newsletter. I expect around 100'000 users in 2 /4hours. Let's suppose that every user will visit 2 pages (forum index + random page). Now: in 3 hours there are 3600*3=10'000 seconds. 200'000 page views in 10'000 seconds are 20 pages every second. I'm not used to work with such a load, i usually have no more than 5 hits per second (on custom scripts, really optimized), and most are from bots that don't download images. So i don't really know where to start from. I will use an external CDN to serve everthing what is different than the .php script pages. Will the server blow up? Should i use stuff like EC2? Should i use an array of servers (like 3 server for the web stuff and the server above for the database)? Is there any great tool (linux, command line based) to test servers under such a load? If anyone can suggest something, i will be happy =) This can also become a great case-study to test the xf app and how it works on heavy loads =) Thank you everyone.