P7 CPU Chip

[Takeda]

While working for IBM, I developed, and taught a semiconductor (microelectronics) course. One of my "show and tells" was a P7 CPU chip (wafer, and modules). The P7 was developed by IBM in 2009, using a 45nm (nanometer) technology. 45nm is the minimum feature size (poly width) for the chip design. The P7 successor is the P8 CPU.

Here are some photos, that I thought would be of interest. The DOF is extremely shallow in some of the photos, even at f/22.


1 300mm silicon wafer. Red rectangle is one of many P7 CPU chips on the wafer.



2 Closer image of P7 CPU chip.



3 P7 CPU chip size comparison to penny.



4 Magnified edge of P7 CPU chip.



5 Magnified edge of P7 CPU chip.



6 Eye of needle used for size reference. Spherical shapes are solder balls used for I/O, power, and ground connections to chip.



7 Black rectangle is backside of “diced” chip attached to ceramic substrate. Chip solder balls are reflowed to attach chip to ceramic substrate.



8 Edge of ceramic substrate.



9 Bottom of ceramic substrate. Gold pads are for chip connections to socket/card.



10 Top of completed module.