Electronic – Can somebody identify this 12″ silicon wafer

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I just bought a silicon wafer off of eBay to decorate my office. The seller didn't tell/know, but I'm dead curious as to what this wafer is. Could anyone help me identify which chips should have been built out of it?

Full picture

Here's a picture of the entire 12" wafer.

Full size picture

Poor man's macro

Here's a zoomed-in picture of the lighter rectangles that are scattered over this wafer. I took it using a super cheap magnifying glass.

macro

Another poor man's macro

Here's another angle trying to show both the light and dark rectangles. Unfortunately I only have a smallish magnifying glass so I can't see any better.

another macro

Extra info

  • This is a 300 mm wafer
  • I couldn't find any marking on the front side
  • The backside has a serial number (K444R215WFB3) and a QR code that's so small I couldn't decipher it.
  • The dark rectangles probably have something drawn in them, but it's impossible to see it even with a magnifying glass.

Best Answer

The light rectangles are for wafer characterization test. The dark ICs are the actual chips.

As to what those chips are, they appear to be some kind of memory, perhaps DRAM.

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