Geforce Ti 4600: is it AGP 1.5v or agp 3.3V

I don't think there ever was an 8x version of the ti4600. If I remember well, the ti got 2 AGP 8x models: the 4200-8x (clocked similarly to the original ti 4200) and the ti 4800 (slight clock increases over 4600). So the ti 4600 should be able to work on any AGP slot (AGP 1.0 i AGP 2X, 2.0 in AGP 4X, 3.0 in AGP 4X).