Hi I just went to a Apple store and tried a HD episode of CSI Miami on both a 1.6 HDD and 1.8 SSD. After a while I realized the graphics was more blocky on 1.6 than the 1.8. No matter what I checked and stopped I could not change it. No other program was running, I let ot rest etc but still it had more choippy graphics. And yes, I made sure it was rev B not rev A... Btw, they both had 'the lines'. If graphics is determined by the graphic card and they both have the same how come the video was not the same quality? Is it really the .26 GHz that made the difference??? I was almost ready to go for a 1.6 HDD but now I have to reconsider.