I am currently replacing the motherboard in my "gaming" system. Going from MSI K7T266 Pro to Asus A7N8X Deluxe. Should be up and running by friday (fingers crossed) and will let you know how it goes. Unfortunately, I don't have the $$$ to upgrade CPU, Memory or Video Card at the moment. Until I upgrade CPU and Memory I will be running this system with AMD 1.4GHz, 512MB PC2100 DDR and Gainward GeForce3 w/64MB.
Then will be upgrading to AMD XP2600+ and 1GB PC3500 DDR ASAP. Will let you know how that goes too!