An anonymous reader writes "Today, Nvidia officially releases the SHIELD. After an unexpected delay last month, the company dropped the price of its hotly-anticipated handheld gaming system from $350 to just $300. Sporting a 5-inch 720p touchscreen attached to an XBox-style controller, the SHIELD is the first serious Android-based handheld gaming device. The SHIELD is also the first major device top ship with Nvidia's new Tegra 4 SoC. But the potentially killer feature of the SHIELD is its ability to steam heavy-duty PC games from your desktop right into your hands. Right now the selection of PC games is pretty scarce, with just 21 titles to choose from so far, though Nvidia promises more to come. Tom's Hardware just posted an exhaustive review of the Nvidia SHIELD, which includes demos of both Android gaming and PC streaming, display and battery testing, plus the usual bevy of performance tests versus the Tegra 3-based Nexus 7 (2012), the new Nexus 7 carrying a Qualcomm Snapdragon S4 Pro, the iPhone 5, and a Wintel tablet with the Atom Z2760. Tegra 4 presents nearly four times the performance of Tegra 3, and leaves most of its competition in the dust. However, it also means that Nvidia is now the only ARM competitor without an OpenGL ES 3.0 implementation on the horizon, making Nvidia's new position as top dog quite uncertain."