Sony has denied the claims of Canada's Semiconductor Insights that the PSX uses a 130nm process rather than a 90nm process. For that article, see here [1].
"Regarding EE+GS peripheral memory, we have used a 130nm process in the past; but this EE+GS memory is designed using a 90nm process. Also, since it is a 1 chip LSI, we have been able to use this 90nm processor technique in final production. There is no mistake in the contents of our announcement made o­n October 26th."