I don't know the answer nor do I know how to find the answer to this. I have a SATA 5400 RPM HDD and an EIDE 7200 RPM HDD. I'm planning to install an OS (Win XP32, I know not impressive) on one of these and I don't know which one is faster. Obviously SATA is the newer kind of drive the the RPMs are lower than the EIDE I also have. Any help would be great.