You can stop wondering what exactly is powering the new Zune HD. On the official Zune Insider podcast, host Matt Akers confirmed the rumors: yep, it's rocking a Tegra. No surprise, that announcement came with a heap of praise for NVIDIA's chip, so much so it's almost painful to listen. "So sick, so much better battery life, graphics acceleration. This thing is like a mini laptop in your hand, right, it's so awesome." We'll have to see about that for ourselves (in September, maybe?), but we are indeed encouraged by the news. Hear it for yourself just below.