[support] Using memcached and xcache on a virtual host box that suports 4 Drupal websites.

Hi, Thank you so much for all your feedback. I am planning on running 4 small Drupal websites on a Dell i5 that has 4 cores / 4 threads / 8G RAM. This is for learning mostly. The server is in my home office. I recently used memcached and xcache to take a Drupal site for one minute page loads to 1 second page loads on a 2 core / 4G RAM VPS. Very impressive. I was wondering if I can use these same techniques on a box that has 4 Drupal virtual hosts on it. Any thoughts? Will I be caching one site to only have to start over when another site gets some traffic? Thanks -- Keith Smith