nginx + varnish + cdn + pagespeed + php-apc. Most definately possible and you will still have 400+mb memory to spare on a 1gb server, avg cpu usage is at 30-40%

nginx + varnish + cdn + pagespeed + php-apc. Most definately possible and you will still have 400+mb memory to spare on a 1gb server, avg cpu usage is at 30-40%. Done it for few clients myself.