Tokyo PC shop Tsukumo built this custom Dreamcast computer. Its innards gutted, the system was "upgraded" with a new motherboard, Blu-ray drive, HDMI, and 160GB hard drive. The controller ports were swapped out for USB inputs and mega-sized fan was added to the bottom. Added up, these changes represent $1000 in hardware modifications. You can't see much of a difference here, but check out the flipside shots:
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The Dreamcast was so ahead of it's time the original hardware would surely have outrun these new gizmos they have placed inside it.