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Arnold GPU supports complex shading networks, SSS, hair, atmospherics, instancing, and procedurals.
With the same settings, GPU renders will currently be noisier than CPU renders since GPU renders are "non-splitting" (i.e. one path per camera/AA sample). Accordingly, to achieve equivalent noise the AA sample count will need to be increased in GPU renders. Adaptive rendering is fully supported.
standard_surface, standard_hair, and standard_volume are supported, with some limitations (see the table below).
OSL is supported, with some limitations currently (see below).
OpenVDB volumes are supported, with some limitations currently (see below).
Volume displacement is supported, with some limitations currently (see below).
Filename attribute tags are supported. Mipmap bias is not supported.
Light linking is not supported on volumes.
Limited AOV support.
Light groups, shadow groups, trace Trace sets are not supported.
Custom procedurals, drivers, color managers are supported.
Custom shaders, cameras, filters, BSDFs are not supported.
Noice is not supported with Arnold GPU renders (because the variance filter is not supported on Arnold GPU)

Multiexcerpt
OSL Initial support for OSL has been added to the GPU renderer. As in the CPU renderer, you can mix and match OSL and Arnold shaders in the same shading network. Note that this initial support is still not complete and currently has a number of limitations as listed below.

Multiexcerpt

OSL

Initial support for OSL has been added to the GPU renderer. As in the CPU renderer, you can mix and match OSL and Arnold shaders in the same shading network. Note that this initial support is still not complete and currently has a number of limitations as listed below.

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Closures

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Emission
Diffuse
Reflection
Refraction
Translucent
Oren-Nayar
Sheen
SSS
Metal & Microfacet

Shading operations

Currently, there is limited support for specific shading operations, as follows:

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Dynamic string operations
Message passing

OpenVDB

Initial support for OpenVDB has been added to the GPU renderer. In this initial implementation, each VDB grid is loaded to GPU in a dense format. While this matches the CPU renderer visually quite well and is feature-complete, the memory consumption can be larger due to the lack of sparse representation. The rendering speed may be slower than CPU in cases with high opacity volumes, as the GPU implementation does not skip empty space as efficiently as the CPU version. The match with CPU will become increasingly good as the step-size parameter is reduced.

Volume displacement

Initial support for volume displacement has been added to the GPU renderer. The rendering speed may be slower than CPU in cases with high opacity volumes, as the GPU implementation does not skip empty space as efficiently as the CPU version. The match with CPU will become increasingly good as the step-size parameter is reduced.

Supported Features and Known Limitations

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style	width:100%

Feature	GPU Support	Notes
Cameras
cyl_camera	Yes


fisheye_camera	Yes


ortho_camera	Yes


persp_camera	Yes


spherical_camera	Yes


uv_camera	Yes


vr_camera	Yes


Color Managers
color_manager_ocio	Yes


color_manager_syncolor	Yes


Drivers
cryptomatte_manifest_driver	No


driver_deepexr	No


driver_exr	Yes


driver_jpeg	Yes


driver_png	Yes


driver_tiff	Yes


Filters
blackman_harris_filter	Yes	One single filter for all AOVs.
box_filter	Yes	One single filter for all AOVs.
gaussian_filter	Yes	One single filter for all AOVs.
triangle_filter	Yes	One single filter for all AOVs.
closest_filter	Yes	One single filter for all AOVs.
All other filters	No	Fallback to box filter. One single filter for all AOVs.
Lights
cylinder_light	Yes


disk_light	Yes


distant_light	Yes

Light groups not supported.


mesh_light	Yes

Light groups not supported.


photometric_light	Yes


point_light	Yes

Light groups not supported.


quad_light	Yes	Light

groups not

portals supported


skydome_light	Yes

Light groups not supported.


spot_light	Yes

Light groups not supported.


Operators
collection	Yes


disable	Yes


include_graph	Yes


materialx	Yes


merge	Yes


set_parameter	Yes


set_transform	Yes


switch_operator	Yes


options	Yes


override	Yes


Shaders
abs	Yes


add	Yes


ambient_occlusion	Yes	Trace sets are not supported.
aov_read_float	Yes


aov_read_int	Yes


aov_read_rgb	Yes


aov_read_rgba	Yes


aov_write_float	Yes


aov_write_int	Yes


aov_write_rgb	Yes


aov_write_rgba	Yes


atan	Yes


atmosphere_volume	Yes


barndoor	Yes


blackbody	Yes


bump2d	Yes


bump3d	Yes


c4d_texture_tag	Yes


c4d_texture_tag_rgba	Yes


cache	Yes	This is a no-op on GPU.
camera_projection	Yes


car_paint	Yes


cell_noise	Yes


checkerboard	Yes

UV sets are not supported.


clamp	Yes


clip_geo	No


color_convert	Yes


color_correct	Yes


color_jitter	Yes


compare	Yes


complement	Yes


complex_ior	Yes


cross	Yes


cryptomatte	No


curvature	Yes	Trace sets are not supported.
divide	Yes


dot	Yes


exp	Yes


facing_ratio	Yes


flakes	Yes


flat	Yes


float_to_int	Yes


float_to_matrix	No


float_to_rgb	Yes


float_to_rgba	Yes


fog	Yes


fraction	Yes


gobo	Yes

mipmap


image	Yes

All textures converted to half-float.

Mip-map bias is not supported.
is_finite	Yes


lambert	Yes


layer_float	Yes


layer_rgba	Yes


layer_shader	Yes


length	Yes


light_blocker	Yes


light_decay	Yes


log	Yes


matrix_interpolate	No


matrix_multiply_vector	Yes	The matrix parameter is not linkable on GPU.
matrix_transform	No


matte

Yes	Arnold 7 added GPU support for the matte closure, matte shader, and matte shape flag
max	Yes


maya_layered_shader	Yes


min	Yes


mix_rgba	Yes


mix_shader	Yes


modulo	Yes


motion_vector	No


multiply	Yes


negate	Yes


noise	Yes


normal_map	Yes


normalize	Yes


osl	Yes	Some limited support for closures and shading operations.
passthrough	Yes


physical_sky	Yes


pow	Yes


query_shape	Yes


ramp_float	Yes	Connected colors and positions not supported.
ramp_rgb	Yes	Connected colors and positions not supported.
random	Yes


range	Yes


ray_switch_rgba	Yes


ray_switch_shader	Yes


reciprocal	Yes


rgb_to_float	Yes


rgb_to_vector	Yes


rgba_to_float	Yes


round_corners	Yes	Trace sets are not supported.
shadow_matte	Yes	This initial version has a number of limitations currently, including: no support for indirect lighting, no AOV generation, and possibly incorrect self-reflections in shadow-matte objects.
shuffle	Yes


sign	Yes


space_transform	Yes	Camera and screen spaces are not supported.
sqrt	Yes


standard_hair	Yes	extra depth and extra samples are not supported
standard_surface	Yes	Diffusion SSS mode is not supported. Transmit AOVs is not supported (so, for example, you'll get solid white in the alpha for transmission)
standard_volume	Yes


state_float	Yes


state_int	Yes


state_vector	Yes


subtract	Yes


switch_rgba	Yes


switch_shader	Yes


toon	No


trace_set	No


trigo	Yes


triplanar	Yes


two_sided	Yes


user_data_float	Yes

User data inherited from parent procedurals is not currently supported
user_data_int	Yes

User data inherited from parent procedurals is not currently supported
user_data_rgb	Yes

User data inherited from parent procedurals is not currently supported
user_data_rgba	Yes

User data inherited from parent procedurals is not currently supported

user_data_string

Yes	User data inherited from parent procedurals is not currently supported
utility	Yes	The edgelength, pixelerror, and nlights color modes are not supported.
uv_projection	Yes


uv_transform	Yes


vector_map	Yes


vector_to_rgb	Yes


volume_sample_float	Yes


volume_sample_rgb	Yes


wireframe	Yes


Shapes
box	Yes