Current and cards dx9 shader precision

[Davros]

Just wondered
back in the day ati cards did 24bit precision while nv did 16 or 32bit
are current amd cards still limited to 24bit in dx9 ?

 

[fellix]

Since the D3D10, the shader pipeline is mandated to support FP32 at all times.

 

[Davros]

I guessed as much So if you played hl2 (a dx9 game) with a recent amd card it would use 32bit precision

 

[fellix]

ATi ditched the FP24 format with the Radeon X1000 Series for good, while NV kept the half-precision bits right until the first generation of DX10 GPUs.

Everything now is FP32 from top to bottom. Well, NV still retains lower precision math in its Tegra SoC graphics.