I do not believe that the comment would be true if the parts that you have put together are meant to be together. I would however agree with the article regarding the "sligh" improvement instead of "major" improvement. the only reason you might not notice a HUGE improvement is because hard drives, regardless of how fast they spin, do have a point at which they become so unstable, that regardless of the speeds your getting, the chances of losing data is too great. Additionally, if you have even a SSD (Solid State Drive), the speed would eventually be governed by your Processor/motherboard/graphics card. So, the conclusion is that once its installed, you can not judge the speed improvements just based on the Hard Drive itself, its a combination of everything else in the computer as well.