Rapid Repair has posted a teardown of the new iPhone 3G S, revealing chips that the service suggests support 720p video. According to the report, the iPhone 3G S contains a Samsung S5PC100 CPU with PowerVR SGX graphics, capable of running at speeds up to 833 MHz—although it’s currently set to run at 600, underclocked in the same fashion that iPhone and iPhone 3G chips were—and powering 720p video playback. Rapid Repair suggests the…