Question about servers and speed.

[Lon]

Hello,
I have a few different cPanel hosting accounts, all from different hosts such as Host Gator, GoDaddy, etc. I am currently running my vBulletin forum on one server, and it goes pretty fast since we are still little. But, I really like to add a lot of things to the forums that make the database bigger and thus, I suppose, giving us less room. Now about my question:

Is there anyway I could "hook" up all those servers together, using the same vBulletin files, same info, same everything [etc], thus possibly making my vBulletin forum faster and letting us have more room to expand?

Another reason I ask this is because a different site that I am a member of that has a huge member base, a lot of plugins and hacks, and tons of user groups, said that they are running on eight (8) different servers, and they are a very speedy site.