I currently have a Seagate IDE 100mb/s 2MB cache hard drive. its on ly 120 gigs. Do you think i will see a performance difference, like frames per sec going to a WD 250GB SATAII 300mb/s 16MB cache?
You will see some performance from the increase in cache but your FPS will not be affected. Sustained transfers will be similar unless you are moving to a faster drive (ie. 5400RPM->7200RPM)