User talk:2A02:F6D:8484:0:FDF3:6373:A494:AF88

About current versions of the 65C816S

They are listed to be capable to 100Mhz+ these days. I think that's because they are no longer being produced using the old manufacturing process, but instead use a much smaller format than the original, thus allowing greater clock speeds during operation. This is what I think. There's no certainty in this by me. The new listing just states 100Mhz+, not why.

Source:

Paragraph 2: "With 200MHz+ 8-bit W65C02S and 100MHz+ 8/16-bit W65C816S processors coming on line in ASIC and FPGA forms, we see these annual volumes continuing for a long, long time."