How many DB's are to much?

Ok, I run a video game site and right now I'm using Access databases. I've made quite a few topics about converting recently and I'm about to make the move. My final question about converting is how I should set up my MySQL DB.

Currently I have an access database for users, a DB for each game consoles cheats, a DB for several different boards, and a few others. I formatted it this way with Access because Access only allows so many users to connect at once and the more users that connect the slower it gets. Plus I wanted to keep the DB size down.

My question is, should I have more than one MySQL DB like I do with the Access DB's now? Another large gaming site (gamefaqs.com) has message boards and cheat codes for every game as well as a lot of users (sometimes 5000 on at once). I believe they use MySQL but I was wondering if a site like that has more than one MySQL db. Does it matter how many MySQL DBs I have? Will the speed of the site slow down and how many users will be allowed at once? If anyone can help with these basic questions as well as any other things I should know then help me out. Thanks.

Are you using MySql or Microsoft SQL Server?
Because you posted this question in the MS SQL Server forum, but you seem to be talking about MySql.

yeah i'm talking about mysql. I was hoping someone might know about it here since i couldn't find a mysql forum

I did a google on MySql Forums and came up with the following which may help:

http://forums.mysql.com/

Use as many mysql databases as you need.