All Apple A series chips were branded as theirs although it was fairly clear that prior to the A6, all A series chips were designed and manufactured by Samsung.

All Apple A series chips were branded as theirs although it was fairly clear that prior to the A6, all A series chips were designed and manufactured by Samsung. The A4 chip was also designed by Samsung (and Intrinsity in collaboration) to compete with Qualcomm and go beyond the 1Ghz clock speed barrier. Bloomberg also seems to think that the A4 was Apple's first processor designed in-house, when Intrinsity was not part of Apple. So I'd like to know how much of Apple's own engineering went into the design of the A4, that wasn't Samsung or Intrinsity.