You´re right but X3100 is (in theory) better than a Radeon 9600/X700 on hardware specs. X3100 is running on a GMA 950-based driver and Intel is slowly introducing X3100 code as they have plenty of time until the GPU-on-the-CPU (as Nahalem) is released. I almost bet that that GPU will be based on an improved X3100...
You are mistaken. Radeon 9600 is not only outdated by current standards, but the fillrate of the X3000 is not better than the Radeon 9600, and Radeon 9600 has vastly better Vertex Shader performance and polygon throughput.
ATI Radeon 9600 Pro, 400MHz core clock, 4 pixel pipeline/1 texture per pipeline/2 vertex shader, 600MHz 128-bit memory
1.6GTexels/s single & multi-textured fill rate
9.6GB/s bandwidth
3DMark2001 SE High Polygon Count test:
1 light: 45.4 MTriangles/s
8 lights: 10.1 MTriangles/s
3DMark2003 Vertex Shader: 10.3 fps
Intel X3000, 667MHz core clock, equivalent pixel pipeline is 2 with special case and 1.6 in most cases with 2 texture per pipeline, 800MHz dual channel 64-bit memory in the best case
1.06GTexels/s in single texture fillrate
2.133GTexels/s in multi texture fillrate
12.8GB/s bandwidth
3DMark2001 SE High Polygon Count test:
1 light: 8.9 MTriangles/s
8 lights: 0.9 MTriangles/s
Same test with software mode:
1 light: 19.8 MTriangles/s
8 lights: 7.8 MTriangles/s
3DMark2003 Vertex Shader: 5.72 fps
Radeon 9600 Pro is 5x and over 10x faster in 1 and 8 light polygon test in 3DMark 2001 SE respectively compared to X3000's hardware T&L. It is also over 2x faster and 50% faster than X3000's software T&L.
It is also almost 2x faster in Vertex Shader performance in 3DMark 2003 test. X3000's test was done with software mode so hardware mode will be equal/slower.
Extremely poor vertex shader performance and low polygon throughput is why the X3000 performs poor in older games and the fps in low resolutions is low.
There is much more I haven't detailed. You don't want to even compare to the X700 variants. The versions of X700 has 2GTexels/s fillrate and higher bandwidth not to mention an updated architecture.