Re: I'm surprised that Hans is sticking to his 256k L2 size estimate. That sure doesn't look like 1/8th the size of the 2MB chunk of L3 to me. Looks more like 1/4 the size. Doesn't it?
It looks somewhat between 1/4 and 1/8, but Hans accounted for that in his density assumptions at the top of the photo. I would expect L2 cache to be less dense than L3, because it is closer to the CPU, likely runs faster, and therefore requires additional logic to reduce FIT rate.