As I've already mentioned, the G2X is powered by NVIDIA's Tegra 2 system-on-chip, which is also found in the . Yes, it is dual-core, but what exactly does this mean? The Tegra 2 has two 1GHz Cortex-A9 CPU cores and eight GeForce GPU cores. It also has native HDMI and dual-display support, so you can watch HD videos from your phone onto your TV.

When NVIDIA showed off the Optimus 2X/G2X back in January, they also touted its multitasking capabilities. I downloaded a few apps from the Market, streamed some music from Pandora, and ran a few games at once. I opened up Angry Birds and the app just ran smoothly. It takes a lot to choke a phone with a 1GHz processor, so I doubt that many consumers really need this extra multitasking power. But it is nice knowing it is there.

The Tegra 2's impressive performance is apparent in other areas of the phone. Scrolling through menus was smooth and apps launched quickly. I was impressed with how smoothly the phone handled video and 3D games. The browser was also quite snappy, loading pages in seconds-and even faster when I got a strong 4G signal.

The game ran fluidly and the graphics looked sharp. We'll be testing more games on the G2X next week, so stay tuned for a full report on which games ran the best, how games look on an HDTV, and what we thought of the NVIDIA TegraZone game store.

T-Mobile's new means that the handset is capable of reaching the 21 mbps of (theoretical) throughput speed that the T-Mobile network is built to deliver. This does not mean that the Sidekick 4G can actually hit 21-mbps download speeds, but rather that it contains a radio and chipset capable of faster speeds than earlier T-Mobile 4G phones achieved.