Apple has confirmed that the iPad uses the same type of graphics chip as the iPhone and iPod Touch, the PowerVR SGX chip. According to reports, Apple's latest iPad SDK Beta 3 documentation confirms this, though does not exactly state what which chip it is:
"Using OpenGL ES on iPad is identical to using OpenGL ES on other iPhone OS devices. An iPad is a PowerVR SGX device and supports the same basic capabilities as other SGX devices. However, because the processor, memory architecture, and screen dimensions are different for iPad, you should always test your code on an iPad device before shipping to ensure performance meets your requirements."
There were rumors that Apple used a less-powerful graphics chip in the iPad, but it seems like these turned out false.
