Power Mac - Problem When Running Final Cut Pro 5..please Help!

I have a PowerMac G4 MDD with dual 867 MHz processors.

When I run playback of video with sound after 2 seconds I receive this error message:


"Warning-Dropped Frames

One or more frames were dropped during playback

If this occurs frequently, try:
-turning off "Unlimited RT"
-Lowering your compression data rate
-closing open sequences
-Lowering the preference for real time audio tracks
-Increasingthe speed of your system and/or disk drives and/or network connection.

RT Extreme has determined these dropped frames were caused by slow disks. Please try:
-Increasing the speed of your disks
-Decreasing the number of RT layers
-Limiting your RT bandwidth in User Preferences."


Now that being said, I dont think it is my hard drive because I've tried running playback of footage saved on 3 different hard drives - 2 internal (60gb and 500gb 7200rpm) and 1 external 160gb hard drive (7200rpm as well) connected thru firewire. I also have 2gb or RAM so I know that's not the problem.

Also, when I run playback of video and audio individually I dont receive this message, but when I run the video along with the sound I want in the film it gives me the message.

I dont think its my hard drives or my cpu's that are too slow. So I'm thinking that my problem is I need a better video card but I'm not sure if that is correct. Right now im running the original video card that came with the mac - GeForce4 MX with 32mb of Vram.

Has anyone else had this problem? Can someone please help??!