Run this:
Code:
wget http://freevps.us/downloads/nginx-centos.sh
bash nginx-centos.sh
to install nginx, php-fpm and mysql on your CentOS VPS.

RAM usage:
64 bit OpenVZ VPS:
Code:
             Total     Used     Free
Kernel:   2048.00M    4.51M 2043.49M
Allocate:  256.00M   69.64M  186.36M (128M Guaranteed)
Commit:    128.00M   30.46M   97.54M (37.3% of Allocated)
32 bit VMWare virtual machine
Code:
 free -m
             total       used       free     shared    buffers     cached
Mem:            59         54          4          0          1         18
-/+ buffers/cache:         40         18
Swap:         2047          0       2047
32 Bit KVM VPS:
Code:
             total       used       free     shared    buffers     cached
Mem:           246         81        165          0          2         46
-/+ buffers/cache:         32        213
Swap:            0          0          0