Cracking open Amazon's Kindle

The Kindle's main processor is a Marvell PXA255 application processor, with the following markings: LUPXA255A0 G7171929.2 0744 KR C400.

According to Wikipedia, Intel released the PXA210 and PXA25x family (PXA250 and PXA255) of XScale processors in 2002 as a replacement for its StrongARM line of processors.

XScale microprocessors are fifth-generation ARM processors based on ARMv5TE architecture. According to Intel's PXA255 datasheet on Alldatasheet.com, the PXA255 supports a flexible CPU clock speed from 100 to 400MHz. The 'C400' marking on the Kindle's chip indicates this is the 400MHz version.

In some Kindle devices, these chips have an Intel logo. Intel sold the PXA processor assets to Marvell in 2006.