Bilinear filtering on some texures?

[Bop]

In games such as Mass Effect and Team Fortress 2 I notice what appears to be bilinear filtering on specific textures. Most texture surfaces look how they should.

I see distinct lines in Mass Effect and in TF2 I see shimmering on the yellow/black lined caution textures. This happens even at 16x AF in TF2.

If i force 16xAF in ME it simply pushes the line further back on certain textures.

It will not occur on other textures and Catalyst AI is not the cause.

Any ideas?