Now, some further clarification should be made about the "Ti4800" and "Ti4800SE" naming that nVidia came up with. Both are actually just Ti4600 and Ti4400 cards, respectively, with only the addition of AGP-8X support. Yes, the Ti4800SE is actually a Ti4400 and not a Ti4600 like most would assume. nVidia also deemed it necessary to name the chipset "NV28" which is what all of these cards are built on and is essentially the NV25 with AGP-8X support.
You can read more in one of my past reviews: http://nvnews.net/reviews/gainward_gf4_ti4800SE/