People have talked about the AmigaOne (and probably Pegasos as well) not having AGP 4x/8x, so I thought I'd write down my recent experience with AGP that should put things in perspective (for myself as well as other people)
In short, AGP 2x/4x/8x makes very little difference until new Amiga compatibles start getting up-to-date games. And even then...
The whole story:
I do tweak performance on my PC quite a lot, and the main purpose of this experience was unrelated to AGP, but AGP became involved anyway because for some reason, my system's AGP driver decided to switch AGP capabilities (ie. 2x/4x/8x) off completely. It was operating in AGP 1x, if that (a few hardware diagnostic utils typically had AGP sections ghosted out, or saying "disabled", or "AGP in PCI mode"). Consider that the machine and graphics card (Nvidia GF4 Ti4200) are both 4x capable.
I hadn't noticed this had happened, and I have been playing Jedi Academy quite a bit recently (recent OpenGL game, severely taxes my machine with some levels), and had noticed an extremely variable 5 - 10 FPS decrease over a period of time. It had got to the point that I was messing around with graphics options both in driver and game to get better performance, something I haven't bothered to do before. Bear in mind this whole process has taken me a week, maybe two. It was the kind of thing that was nagging at the back of my mind, thinking something seems a bit off.
Anyway, changing graphics options in game or driver made very little difference to the issue in hand. Why? Because games like Jedi Academy are designed for particular resolutions, and all the textures designed with that in mind. Those same textures are sent to the graphics card, regardless of what gfx resolution the game has been set to, and so the same bandwidth is used. The graphics card's abilities remain the same, it's just a very obscure bottleneck.
I noticed zero difference in 2D performance/responsiveness. Older games such as Quake 3 operated at identical speed with AGP performance working properly or not.
Bear in mind that I do pay a lot of attention to my PC's performance, simply because it's not the "latest" anymore, and so games like Tomb Raider 6 or Jedi Academy really don't perform tip-top on it.
