The reason, why some chips overclock so high is date of manufacture, not code (part number) of the memory chips.
So knowing actual part number, for example HY57V28820HCT-H, is not crucial how high average overclock on these chips will be, but date of manufacture.

When you check all your V) category chips (Extreme), those are made from about august 2006 to year 2007... and one memory stick is even made from chips made in 2009!
In that time, the bad chip with zero overclock from 133 MHz just couldn't be made, because same process was already enhanced to maximum and set for late DDR1 memories. They were produced in that time for various OEM and industrial machines, so there are replacement units available.
Even despite the fact, that they could already make PC3200 DDR1 memories, they just made chips same way, set them internally as SDR instead DDR, and marked them by highest official number: PC133. Because that was standard, and that was according what customers ordering replacement units were orienting. In other words, despite the fact, that most of the chips made in 2006 and later could reach 166-200 MHz , sometimes even more, they've marked them PC133 anyway, so ordering lists are not out of stock. They didn't marked them PC150 or PC166, because that could confuse customers and it could lead to situation, that they will pick competition for PC133 replacement units.

So PC150 or PC166 has only historical importance, as for example in year 2000 or 2001, most of the chips could not reach 150 or 166 MHz frequency, but when you bought expensive PC150 or PC166 in that time, you had guarantee thay are rated for this speed . They were cherry-picked in that time.

Of course now is the trick to pick PC133 memory module with chips from quality manufacturer like Samsung and try to get some 2006-2009 -ish modules. There is great chance, you will end up with some that are able to achieve insane overclocks close to 200 MHz or over 200 MHz. But in 2000 or 2001, there was no other choice as to pick PC150 or PC166 memories. With PC133, you were not usually lucky, and for sure, you couldn't reach 180-250 MHz speeds in that time, even if you would bought 1000 of them.