I have pretty much that same setup as well. I cranked all the AA and run at the same res. Only difference is my 6320 Dual Core is O/C to 2.8 ghz not that it needs to be for this this sim. If i unlock the max fps it will go up to 200 and bounce down 150fps full grid. I have it locked at 100 though. Never drops. Defiantly check the drivers for all your hardware including chipset drivers. There are some important drivers for the chipset that will control your PCI-E slot(s). However I would start with the Graphics Card Drivers like it recommended by others here. If none of that works and you are getting crashes, not that you said you were, use Memtest86 boot CD to check for bad memory. If you get red in Memtest86 try one stick at a time until you find the bad stick. Good luck.
No. Forza 2 doesn't have logitech drivers built into the game last that I heard. I suppose it could be added in a live update at some point, but since MS makes the wheel for Forza 2 (ms wireless racing wheel) we will prolly never see it for forza 2. I have the MS wireless racing wheel and forza 2. Since i found LFS i don't play it anymore.
Since this is a remote server you might try increasing the 'max_allowed_packets' setting in your mysql config file. Not sure how much data you are sending to the server at one time, but I have an experience this week on our webserver at work that caused me to have to increase the amount allowed. I would try different port/firewall settings first though. It has been reported that the 'max_allowed_packets' increase can cause a performance hit on the database server. However, I cannot confirm or deny that statement.
Good Luck! and back up those config files first!
Edit* You know. Unless you are send a lot of data ( > 1m at a time) then max_allowed_packets is not the problem. I thought about the settings for allowed hosts for each user account. Default is local. So a SSH tunnel would bounce off the loopback and hit the database from the localhost, since most mysql users are setup this way. Or you could change it to allow the host you are connecting from. I may be giving you information you already know, but i thought i would throw this out there.