I had a GeForce MX 440 IGP on my old HP computer paired with an Athlon XP 2600+. When I tried to upgrade, i discovered that the HP proprietary 150W PSU wouldn't support a true graphics card, and I could not use any other PSU with that computer, so thats when I decided I would never buy manufactured again.
The X300 is better...but the 6200 is better yet. The 6200 is fully DX9 compliant, while its probably not powerful enough to even use its features.