[Ailos]

Go into your bios setting and dedicate at least 256 MB of your RAM to the APU's graphics section. The APU dynamically uses system memory as it needs it but the only hard number one might see is the smallest amount it'd request (which is probably something like 16 or 64 MB) which is below PS2's minimum requirements and thus when your client checks your hardware it thinks you don't have enough.

Side note: PS2 likes L3 cache and that Trinity APU has none. It also like quadcores, and that's a dualcore part. Heads up: it'll run but you probably won't be happy with it. If your motherboard supports it, swap out in favor of an 8GB RAM kit - at least the graphics portion of your APU will be able to breathe easier.