At the very least, half of the cache is disabled. They cherry-picked a feature from the Pentium III lineup that they wanted to keep while lowering the cache to Celeron levels. It's a deliberate modification to reduce cost while maintaining desired performance.
It's not detectably customized beyond that but it's not like it's a SKU you can buy off the shelf, either.
And yes, the CPU was customized:
https://www.anandtech.com/show/853/2
At the very least, half of the cache is disabled. They cherry-picked a feature from the Pentium III lineup that they wanted to keep while lowering the cache to Celeron levels. It's a deliberate modification to reduce cost while maintaining desired performance.
It's not detectably customized beyond that but it's not like it's a SKU you can buy off the shelf, either.