TFA states extensive 300Mhz OC with no special effort (and he's been evaluating pre-release versions for a year).
"It overclocks insanely well. I’ve been running the device at 300MHz in all of my projects with no issues at all."
Also
"Disclaimer:
I was not paid or compensated for this article in any way. I was not asked to write it. I did not seek or obtain any approval from anyone to say anything I said. My early access to the RP2350 was not conditional on me saying something positive (or anything at all) about it publicly."
"It overclocks insanely well. I’ve been running the device at 300MHz in all of my projects with no issues at all."
Also
"Disclaimer: I was not paid or compensated for this article in any way. I was not asked to write it. I did not seek or obtain any approval from anyone to say anything I said. My early access to the RP2350 was not conditional on me saying something positive (or anything at all) about it publicly."