Need an update to graphics card... WHICH ONE

[IMD1]

It's better to spend a bit more and get a really good nividia 9 series card instead. Even though you won't get all the benefits you can get good deals on most of the 9 and 8 series cards if they are pcie2. It's hard to find good deals on agp cards and if you ever get a new computer or upgrade the motherboard you'll reap the extra benefits from the card anyways. A 9400gt is really weak but assuming this is just for dolphin you should be fine.