Well, by getting the conventional drive out of the same box with the CPU in it, you're essentially removing all moving parts from that enclosure. With a SSD (and now that they've inexplicably excised the optical drive), suspect that there are no moving parts left at all; everything will be electronic, nothing mechanical. Hence, a more inert box.
Whether this makes a lick of difference sonically, I have no idea. But there's at least a plausible theory behind it, no?
Whether this makes a lick of difference sonically, I have no idea. But there's at least a plausible theory behind it, no?