I have ATI Radeon X550 Video Card and it support truform, and have a ATI Radeon HD 2600 XT.
And have a question: does anyone know how to emulate truform?
These very painful to have modern computer and always change video card i think newest video cards can able to ate trufrom without loss of speed.
TruForm was a marketing term used by ATI for an early attempt at hardware tesselation.
These days the better general approach would be to use Tesselation Shaders (although your 2600 XT won’t support OpenGL 4.0) or to some limited extent Geometry Shaders.
There also exists the possibility of using CUDA to perform the task instead: CUDA paper
ATI did release an extention for PN Triangles (TruForm) ATI_pn_triangles