Mind you CURRENTLY, 4.0 chipsets also use WAY more power and generate WAY more heat than their 3.0 counterparts to the point that almost every 4.0 drive that has been released was forced to include heatspreader/heatsink (I only know of 1 so far that doesn’t). Also the current most common chipset (phison E16) is only usually maxing around 4200/3500, compared to the top 3.0 drives maxing around 3500/3000, so there isn’t hardware YET capable of actually taking full advantage of 4.0.