I will be redoing the TrueCrypt Benchmarks in the next week on a new PC that is standard spec where I work. It will be Core 2 based with 1GB RAM and SATA drives. I am running TrueCrypt’s FDC on my MacBook Pro under Bootcamp and I haven’t noticed any perceivable performance drop even playing games like COD4 and Company of Heroes.
EDIT: I have started the testing, but things at work just went waaayyyy wrong. These will be out as soon as I can get them done.