English: This is an Intel Pentium 4 640. It was made in 2004, uses the LGA775 socket, has a clock speed of 3.2 GHz and 2M of L2 cache. It also supports hyper threading and has an S-spec of SL7Z8. Indium solder was used between the die and the heat spreader.
This chip is one of the very first chips I opened up, I was not as good at preventing scratches to the die back then. The colours in this picture are quite disappointing, but the details are very good. Some chips do not show as many colours under the ring light. In the past I have had a lot of trouble in getting pictures of this chip to render properly, this is by far the best one yet.
If you view this image from a desktop browser you can see several annotations I left on the image indicating what certain parts of the chip do. This information is based on the diagram from here: www.chip-architect.org/news/Prescott_90_nm_die_text_1600x...
Camera: Pixel 2XL
Number of Images: 156
Overlap: 65%
Microscope Objective: 4X Plan
Microscope Eyepiece: 10X
Camera Zoom: 2.3X (Prevents distortion)
Grid Used: 3x3 (Panning Aid)
Capture Motion: Serpentine
Stitching Software: Autopano Giga
Other Software: GIMP was used to compress PNG of size 475.9MB to JPG of size 132.6MB
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