I have a several 1600+(all locked)
AGOIA 0212 Y does 176FSB
AGOIA 0213 Y does 185FSB
AGOIA 0204 K not sure what it does never installed it
and my new one AGOIA 0226 Z, just put her in have it at 166FSB, would be pushing her today but a BIOS flash went bad, so I am waiting for a new motherboard...
The one thing I am sure about with most of AGOIA 1600+ is that they will do 166FSB right out of the box(or OEM package), and that's not so bad an extra 350MHz just for plugging it in...