They always have rejects. Actually, that's almost certainly an unfinished wafer. Modern flip chips don't look like that finished - you have an array of pads and power distribution covering all the cool features.
I think there's a good chance that wafer doesn't have any metal layers, or only M1 at most. It looks the same as the chips I've delayered and removed all or almost all of the metal layers from. For example, here's a shot of the Wii's GPU with the metal layers scraped off:
I think there's a good chance that wafer doesn't have any metal layers, or only M1 at most. It looks the same as the chips I've delayered and removed all or almost all of the metal layers from. For example, here's a shot of the Wii's GPU with the metal layers scraped off:
https://marcan.st/transf/hollywood_die.jpg