Thanks to HardwareZ for spotting this Info @ VR-Zone!

This is picture of an updated version of the GeForce4 Ti4600 GPU and apparently NVIDIA has updated their GeForce4 Ti4600 stepping from A2 to A3. If the new stepping can improve its overclockability...

To see the picture and the new clock speeds hit Read More.

New GeForce4 Ti4600 A3 Stepping