Nv40, Nv3x, R300, R420 users, Question Please

ChrisRay, theres something wrong here. Does the CPU affect the results?
I have a P4- 2.8Ghz with Radeon 9600Pro Cat 4.6 Drivers and my results seems better than a 9700Pro. Here is mine:

Code: 
Pete's framebuffer read speed test
Mail: [email]BlackDove@addcom.de[/email]
Homepage: http://home.t-online.de/home/PeteBernert/

Vendor: ATI Technologies Inc.
Version: 1.5.4391 WinXP Release
Renderer: RADEON 9600 x86/SSE2

---------------------------------
OpenGL extensions:
GL_ARB_multitexture GL_EXT_texture_env_add GL_EXT_compiled_vertex_array GL_S3_s3tc GL_ARB_depth_texture GL_ARB_fragment_program GL_ARB_fragment_shader GL_ARB_multisample GL_ARB_occlusion_query GL_ARB_point_parameters GL_ARB_shader_objects GL_ARB_shading_language_100 GL_ARB_shadow GL_ARB_shadow_ambient GL_ARB_texture_border_clamp GL_ARB_texture_compression GL_ARB_texture_cube_map GL_ARB_texture_env_add GL_ARB_texture_env_combine GL_ARB_texture_env_crossbar GL_ARB_texture_env_dot3 GL_ARB_texture_mirrored_repeat GL_ARB_transpose_matrix GL_ARB_vertex_blend GL_ARB_vertex_buffer_object GL_ARB_vertex_program GL_ARB_vertex_shader GL_ARB_window_pos GL_ATI_draw_buffers GL_ATI_element_array GL_ATI_envmap_bumpmap GL_ATI_fragment_shader GL_ATI_map_object_buffer GL_ATI_separate_stencil GL_ATI_texture_env_combine3 GL_ATI_texture_float GL_ATI_texture_mirror_once GL_ATI_vertex_array_object GL_ATI_vertex_attrib_array_object GL_ATI_vertex_streams GL_ATIX_texture_env_combine3 GL_ATIX_texture_env_route GL_ATIX_vertex_shader_output_point_size GL_EXT_abgr GL_EXT_bgra GL_EXT_blend_color GL_EXT_blend_func_separate GL_EXT_blend_minmax GL_EXT_blend_subtract GL_EXT_clip_volume_hint GL_EXT_draw_range_elements GL_EXT_fog_coord GL_EXT_multi_draw_arrays GL_EXT_packed_pixels GL_EXT_point_parameters GL_EXT_rescale_normal GL_EXT_secondary_color GL_EXT_separate_specular_color GL_EXT_shadow_funcs GL_EXT_stencil_wrap GL_EXT_texgen_reflection GL_EXT_texture3D GL_EXT_texture_compression_s3tc GL_EXT_texture_cube_map GL_EXT_texture_edge_clamp GL_EXT_texture_env_combine GL_EXT_texture_env_dot3 GL_EXT_texture_filter_anisotropic GL_EXT_texture_lod_bias GL_EXT_texture_mirror_clamp GL_EXT_texture_object GL_EXT_texture_rectangle GL_EXT_vertex_array GL_EXT_vertex_shader GL_HP_occlusion_test GL_NV_texgen_reflection GL_NV_blend_square GL_NV_occlusion_query GL_ARB_point_sprite GL_SGI_color_matrix GL_SGIS_texture_edge_clamp GL_SGIS_texture_border_clamp GL_SGIS_texture_lod GL_SGIS_generate_mipmap GL_SGIS_multitexture GL_SUN_multi_draw_arrays GL_WIN_swap_hint WGL_EXT_extensions_string WGL_EXT_swap_control 
---------------------------------

Frontbuffer reading speed (back)
---------------------------------

Format: 01 - Speed:  29.4694 Mpix/s  88.4081 MB/s

Format: 02 - Speed:  28.4863 Mpix/s  113.945 MB/s

Format: 03 - Speed:  29.7315 Mpix/s  89.1945 MB/s

Format: 04 - Speed:  28.7485 Mpix/s  114.994 MB/s



Frontbuffer reading speed (front)
---------------------------------

Format: 01 - Speed:  29.797 Mpix/s  89.3911 MB/s

Format: 02 - Speed:  28.6829 Mpix/s  114.732 MB/s

Format: 03 - Speed:  29.7097 Mpix/s  89.129 MB/s

Format: 04 - Speed:  28.5519 Mpix/s  114.207 MB/s
 
I'm running an Athlon 1700+ with an AIW 9800 Pro, Cat 4.6:

Frontbuffer reading speed (back)
---------------------------------

Format: 01 - Speed: 12.8669 Mpix/s 38.6007 MB/s

Format: 02 - Speed: 11.7091 Mpix/s 46.8364 MB/s

Format: 03 - Speed: 15.3136 Mpix/s 45.9407 MB/s

Format: 04 - Speed: 14.4331 Mpix/s 57.7325 MB/s



Frontbuffer reading speed (front)
---------------------------------

Format: 01 - Speed: 15.2262 Mpix/s 45.6786 MB/s

Format: 02 - Speed: 14.3961 Mpix/s 57.5843 MB/s

Format: 03 - Speed: 15.3354 Mpix/s 46.0063 MB/s

Format: 04 - Speed: 14.3524 Mpix/s 57.4095 MB/s
 
9700 Pro,
Cat 4.4 (Gamma hotfix release)
Athlon 1000 (133*8.5)
AGP 4x (fast writes off)

Code: 
Vendor: ATI Technologies Inc.
Version: 1.5.4273 WinXP Release
Renderer: RADEON 9700 PRO x86/MMX/3DNow!

---------------------------------
OpenGL extensions:
GL_ARB_multitexture GL_EXT_texture_env_add GL_EXT_compiled_vertex_array GL_S3_s3tc GL_ARB_depth_texture GL_ARB_fragment_program GL_ARB_multisample GL_ARB_occlusion_query GL_ARB_point_parameters GL_ARB_shadow GL_ARB_shadow_ambient GL_ARB_texture_border_clamp GL_ARB_texture_compression GL_ARB_texture_cube_map GL_ARB_texture_env_add GL_ARB_texture_env_combine GL_ARB_texture_env_crossbar GL_ARB_texture_env_dot3 GL_ARB_texture_mirrored_repeat GL_ARB_transpose_matrix GL_ARB_vertex_blend GL_ARB_vertex_buffer_object GL_ARB_vertex_program GL_ARB_window_pos GL_ATI_draw_buffers GL_ATI_element_array GL_ATI_envmap_bumpmap GL_ATI_fragment_shader GL_ATI_map_object_buffer GL_ATI_separate_stencil GL_ATI_texture_env_combine3 GL_ATI_texture_float GL_ATI_texture_mirror_once GL_ATI_vertex_array_object GL_ATI_vertex_attrib_array_object GL_ATI_vertex_streams GL_ATIX_texture_env_combine3 GL_ATIX_texture_env_route GL_ATIX_vertex_shader_output_point_size GL_EXT_abgr GL_EXT_bgra GL_EXT_blend_color GL_EXT_blend_func_separate GL_EXT_blend_minmax GL_EXT_blend_subtract GL_EXT_clip_volume_hint GL_EXT_draw_range_elements GL_EXT_fog_coord GL_EXT_multi_draw_arrays GL_EXT_packed_pixels GL_EXT_point_parameters GL_EXT_rescale_normal GL_EXT_secondary_color GL_EXT_separate_specular_color GL_EXT_shadow_funcs GL_EXT_stencil_wrap GL_EXT_texgen_reflection GL_EXT_texture3D GL_EXT_texture_compression_s3tc GL_EXT_texture_cube_map GL_EXT_texture_edge_clamp GL_EXT_texture_env_combine GL_EXT_texture_env_dot3 GL_EXT_texture_filter_anisotropic GL_EXT_texture_lod_bias GL_EXT_texture_mirror_clamp GL_EXT_texture_object GL_EXT_texture_rectangle GL_EXT_vertex_array GL_EXT_vertex_shader GL_ARB_shading_language_100 GL_ARB_shader_objects GL_ARB_vertex_shader GL_ARB_fragment_shader GL_HP_occlusion_test GL_NV_texgen_reflection GL_NV_blend_square GL_NV_occlusion_query GL_NV_point_sprite GL_ARB_point_sprite GL_SGI_color_matrix GL_SGIS_texture_edge_clamp GL_SGIS_texture_border_clamp GL_SGIS_texture_lod GL_SGIS_generate_mipmap GL_SGIS_multitexture GL_SUN_multi_draw_arrays GL_WIN_swap_hint WGL_EXT_extensions_string WGL_EXT_swap_control 
---------------------------------

Frontbuffer reading speed (back)
---------------------------------

Format: 01 - Speed:  14.0497 Mpix/s  42.149 MB/s

Format: 02 - Speed:  9.81731 Mpix/s  39.2692 MB/s

Format: 03 - Speed:  5.93402 Mpix/s  17.8021 MB/s

Format: 04 - Speed:  13.8751 Mpix/s  55.5005 MB/s



Frontbuffer reading speed (front)
---------------------------------

Format: 01 - Speed:  13.9842 Mpix/s  41.9526 MB/s

Format: 02 - Speed:  13.8269 Mpix/s  55.3076 MB/s

Format: 03 - Speed:  14.2024 Mpix/s  42.6071 MB/s

Format: 04 - Speed:  13.8751 Mpix/s  55.5005 MB/s
 
( Just a friendly suggestion : plz cut out the extension listings, it's annoying having to scroll through them 94838562 times. )
 
AXP 2000+
R9800Pro
AGP 8x FW
Cat 4.5

Code: 
Vendor: ATI Technologies Inc.
Version: 1.5.4332 Win2000 Release
Renderer: RADEON 9800 Pro x86/MMX/3DNow!/SSE


Frontbuffer reading speed (back)
---------------------------------

Format: 01 - Speed:  17.6947 Mpix/s  53.0842 MB/s
Format: 02 - Speed:  17.0831 Mpix/s  68.3322 MB/s
Format: 03 - Speed:  17.7166 Mpix/s  53.1497 MB/s
Format: 04 - Speed:  17.3015 Mpix/s  69.206 MB/s


Frontbuffer reading speed (front)
---------------------------------

Format: 01 - Speed:  17.7821 Mpix/s  53.3463 MB/s
Format: 02 - Speed:  17.3015 Mpix/s  69.206 MB/s
Format: 03 - Speed:  17.7166 Mpix/s  53.1497 MB/s
Format: 04 - Speed:  17.3452 Mpix/s  69.3808 MB/s
 
The 6800 uses full AGP bandwidth for readbacks, earlier nvidia cards only support PCI read backs. So the scores are still low, you should be able to get around 2GB per second with 8x AGP.

ATI doesn't even reach PCI speeds, but their OpenGL driver does tend to be lacking when it comes to things like this.
 
AthlonXP 2500+
WinXP SP1
512MB DDR333 Memory
NVIDIA NF2-G Chipset
Leadtek 6800 NU stock speeds (325/700)
61.34 Drivers

Code: 
Frontbuffer reading speed (back)
---------------------------------

Format: 01 - Speed:  35.1491 Mpix/s  105.447 MB/s

Format: 02 - Speed:  36.1795 Mpix/s  144.718 MB/s

Format: 03 - Speed:  38.0327 Mpix/s  114.098 MB/s

Format: 04 - Speed:  38.0546 Mpix/s  152.218 MB/s



Frontbuffer reading speed (front)
---------------------------------

Format: 01 - Speed:  37.2244 Mpix/s  111.673 MB/s

Format: 02 - Speed:  37.3555 Mpix/s  149.422 MB/s

Format: 03 - Speed:  37.8798 Mpix/s  113.639 MB/s

Format: 04 - Speed:  37.9017 Mpix/s  151.607 MB/s
 
Soyo KT333CF (KT400)

Code: 
Vendor: NVIDIA Corporation
Version: 1.5.1
Renderer: GeForce FX 5900XT/PCI/SSE/3DNOW!

---------------------------------

Frontbuffer reading speed (back)
---------------------------------

Format: 01 - Speed:  45.0451 Mpix/s  135.135 MB/s

Format: 02 - Speed:  45.4164 Mpix/s  181.666 MB/s

Format: 03 - Speed:  44.7409 Mpix/s  134.223 MB/s

Format: 04 - Speed:  46.0063 Mpix/s  184.025 MB/s



Frontbuffer reading speed (front)
---------------------------------

Format: 01 - Speed:  45.0451 Mpix/s  135.135 MB/s

Format: 02 - Speed:  45.3509 Mpix/s  181.404 MB/s

Format: 03 - Speed:  45.897 Mpix/s  137.691 MB/s

Format: 04 - Speed:  45.1543 Mpix/s  180.617 MB/s
 
GameCat said:
The 6800 uses full AGP bandwidth for readbacks, earlier nvidia cards only support PCI read backs. So the scores are still low, you should be able to get around 2GB per second with 8x AGP.

ATI doesn't even reach PCI speeds, but their OpenGL driver does tend to be lacking when it comes to things like this.
Click to expand...


There's gotta be more to it than that. My results for my Geforce FX 5900 were taken from my second Rig.

Which is an Athlon XP 2000+ with AGP 4x. and I get much faster results than my 6800 NU with an Athlon XP 3200+ with AGP 8x.


AA does play a role. So best to disable that for these tests.
 
Clockspeeds of the core dont play much role neither does memory speed on the video card. The benchmarks margin for error makes the following a little hard to read but essentially the scores are even.

Same setup as above.. but with better test conditions:

Stock speed 325/700

Code: 
Frontbuffer reading speed (back)
---------------------------------

Format: 01 - Speed:  30.5179 Mpix/s  91.5538 MB/s
Format: 02 - Speed:  32.8984 Mpix/s  131.594 MB/s
Format: 03 - Speed:  33.3797 Mpix/s  100.139 MB/s
Format: 04 - Speed:  32.1345 Mpix/s  128.538 MB/s


Frontbuffer reading speed (front)
---------------------------------

Format: 01 - Speed:  32.6151 Mpix/s  97.8452 MB/s
Format: 02 - Speed:  32.9085 Mpix/s  131.634 MB/s
Format: 03 - Speed:  32.7462 Mpix/s  98.2385 MB/s
Format: 04 - Speed:  33.9913 Mpix/s  135.965 MB/s

351/700

Code: 
Frontbuffer reading speed (back)
---------------------------------

Format: 01 - Speed:  32.4311 Mpix/s  97.2932 MB/s
Format: 02 - Speed:  31.1818 Mpix/s  124.727 MB/s
Format: 03 - Speed:  34.3627 Mpix/s  103.088 MB/s
Format: 04 - Speed:  33.3141 Mpix/s  133.257 MB/s


Frontbuffer reading speed (front)
---------------------------------

Format: 01 - Speed:  33.6418 Mpix/s  100.925 MB/s
Format: 02 - Speed:  32.9853 Mpix/s  131.941 MB/s
Format: 03 - Speed:  33.4671 Mpix/s  100.401 MB/s
Format: 04 - Speed:  31.785 Mpix/s  127.14 MB/s

325/802

Code: 
Frontbuffer reading speed (back)
---------------------------------

Format: 01 - Speed:  31.2825 Mpix/s  93.8476 MB/s
Format: 02 - Speed:  33.3141 Mpix/s  133.257 MB/s
Format: 03 - Speed:  34.2316 Mpix/s  102.695 MB/s
Format: 04 - Speed:  32.4403 Mpix/s  129.761 MB/s


Frontbuffer reading speed (front)
---------------------------------

Format: 01 - Speed:  31.1486 Mpix/s  93.4459 MB/s
Format: 02 - Speed:  34.4719 Mpix/s  137.888 MB/s
Format: 03 - Speed:  34.4064 Mpix/s  103.219 MB/s
Format: 04 - Speed:  34.1006 Mpix/s  136.402 MB/s

351/802

Code: 
Frontbuffer reading speed (back)
---------------------------------

Format: 01 - Speed:  30.8456 Mpix/s  92.5368 MB/s
Format: 02 - Speed:  32.6919 Mpix/s  130.768 MB/s
Format: 03 - Speed:  31.8554 Mpix/s  95.5661 MB/s
Format: 04 - Speed:  33.904 Mpix/s  135.616 MB/s

Frontbuffer reading speed (front)
---------------------------------

Format: 01 - Speed:  33.3578 Mpix/s  100.073 MB/s
Format: 02 - Speed:  32.0034 Mpix/s  128.014 MB/s
Format: 03 - Speed:  33.2268 Mpix/s  99.6803 MB/s
Format: 04 - Speed:  33.3797 Mpix/s  133.519 MB/s
 
Athlon 64 3200+ @ 2100MHz, VIA K8T800 so AGP is ~70Mhz, AGP 8x, fast writes + SBA on:

FX5200 64MB, 64-bit:
Code: 
Vendor: NVIDIA Corporation
Version: 1.5.1
Renderer: GeForce FX 5200/AGP/SSE2/3DNOW!

Frontbuffer reading speed (back)
---------------------------------
Format: 01 - Speed:  45.897 Mpix/s  137.691 MB/s
Format: 02 - Speed:  46.5524 Mpix/s  186.21 MB/s
Format: 03 - Speed:  46.9356 Mpix/s  140.807 MB/s
Format: 04 - Speed:  46.9893 Mpix/s  187.957 MB/s

Frontbuffer reading speed (front)
---------------------------------
Format: 01 - Speed:  46.2029 Mpix/s  138.609 MB/s
Format: 02 - Speed:  46.2247 Mpix/s  184.899 MB/s
Format: 03 - Speed:  46.6398 Mpix/s  139.919 MB/s
Format: 04 - Speed:  46.6179 Mpix/s  186.472 MB/s
9800Pro 128MB with XT bios and clocks somewhere between Pro and XT:
Code: 
Vendor: ATI Technologies Inc.
Version: 1.5.4453 WinXP Release
Renderer: RADEON 9800 x86/MMX/3DNow!/SSE2

Frontbuffer reading speed (back)
---------------------------------
Format: 01 - Speed:  33.2704 Mpix/s  99.8113 MB/s
Format: 02 - Speed:  32.5495 Mpix/s  130.198 MB/s
Format: 03 - Speed:  33.2678 Mpix/s  99.8033 MB/s
Format: 04 - Speed:  32.5714 Mpix/s  130.286 MB/s

Frontbuffer reading speed (front)
---------------------------------
Format: 01 - Speed:  33.2923 Mpix/s  99.8769 MB/s
Format: 02 - Speed:  32.5615 Mpix/s  130.246 MB/s
Format: 03 - Speed:  33.3141 Mpix/s  99.9424 MB/s
Format: 04 - Speed:  32.5495 Mpix/s  130.198 MB/s
 
6800gt @stock 350/1000 with 61.71

Code: 
Pete's framebuffer read speed test
Mail: [email]BlackDove@addcom.de[/email]
Homepage: http://home.t-online.de/home/PeteBernert/

Vendor: NVIDIA Corporation
Version: 1.5.1
Renderer: GeForce 6800 GT/AGP/SSE2


Frontbuffer reading speed (back)
---------------------------------

Format: 01 - Speed:  167.619 Mpix/s  502.858 MB/s

Format: 02 - Speed:  159.125 Mpix/s  636.499 MB/s

Format: 03 - Speed:  218.65 Mpix/s  655.95 MB/s

Format: 04 - Speed:  171.333 Mpix/s  685.332 MB/s



Frontbuffer reading speed (front)
---------------------------------

Format: 01 - Speed:  172.032 Mpix/s  516.096 MB/s

Format: 02 - Speed:  157.068 Mpix/s  628.272 MB/s

Format: 03 - Speed:  211.288 Mpix/s  633.864 MB/s

Format: 04 - Speed:  160.345 Mpix/s  641.379 MB/s
 
Pete's framebuffer read speed test
Mail: BlackDove@addcom.de
Homepage: http://home.t-online.de/home/PeteBernert/

Vendor: NVIDIA Corporation
Version: 1.5.1
Renderer: GeForce 6800 Ultra/AGP/SSE2


---------------------------------

Frontbuffer reading speed (back)
---------------------------------

Format: 01 - Speed: 186.581 Mpix/s 559.743 MB/s

Format: 02 - Speed: 174.118 Mpix/s 696.472 MB/s

Format: 03 - Speed: 235.624 Mpix/s 706.871 MB/s

Format: 04 - Speed: 176.488 Mpix/s 705.954 MB/s



Frontbuffer reading speed (front)
---------------------------------

Format: 01 - Speed: 189.552 Mpix/s 568.656 MB/s

Format: 02 - Speed: 173.002 Mpix/s 692.008 MB/s

Format: 03 - Speed: 233.002 Mpix/s 699.007 MB/s

Format: 04 - Speed: 185.882 Mpix/s 743.528 MB/s
 
Hmm. . . Once again some rather disappointing results from ATI. Hopefully it's just an issue they have with AGP which will not be reflected in their PCI-Express solutions.
 
ChrisRay said:
http://members.cox.net/omega1979/chris/readbackbuffer.zip

Please download this program


It reports framebuffer readback speeds for your GPU. Mostly interested in r300/r420 results.

When you post your results. Make sure to list your GPU.

Thanks :)

Code: 
[b]Geforce 6800 Non Ultra[/b]
Pete's framebuffer read speed test
Mail: [email]BlackDove@addcom.de[/email]
Homepage: http://home.t-online.de/home/PeteBernert/

Vendor: NVIDIA Corporation
Version: 1.5.1
Renderer: GeForce 6800/AGP/SSE/3DNOW!

---------------------------------
OpenGL extensions:
GL_ARB_depth_texture GL_ARB_fragment_program GL_ARB_fragment_program_shadow GL_ARB_fragment_shader GL_ARB_imaging GL_ARB_multisample GL_ARB_multitexture GL_ARB_occlusion_query GL_ARB_point_parameters GL_ARB_point_sprite GL_ARB_shadow GL_ARB_shader_objects GL_ARB_shading_language_100 GL_ARB_texture_border_clamp GL_ARB_texture_compression GL_ARB_texture_cube_map GL_ARB_texture_env_add GL_ARB_texture_env_combine GL_ARB_texture_env_dot3 GL_ARB_texture_mirrored_repeat GL_ARB_texture_non_power_of_two GL_ARB_transpose_matrix GL_ARB_vertex_buffer_object GL_ARB_vertex_program GL_ARB_vertex_shader GL_ARB_window_pos GL_ATI_draw_buffers GL_ATI_texture_float GL_ATI_texture_mirror_once GL_S3_s3tc GL_EXT_texture_env_add GL_EXT_abgr GL_EXT_bgra GL_EXT_blend_color GL_EXT_blend_equation_separate GL_EXT_blend_func_separate GL_EXT_blend_minmax GL_EXT_blend_subtract GL_EXT_compiled_vertex_array GL_EXT_Cg_shader GL_EXT_depth_bounds_test GL_EXT_draw_range_elements GL_EXT_fog_coord GL_EXT_multi_draw_arrays GL_EXT_packed_pixels GL_EXT_pixel_buffer_object GL_EXT_point_parameters GL_EXT_rescale_normal GL_EXT_secondary_color GL_EXT_separate_specular_color GL_EXT_shadow_funcs GL_EXT_stencil_two_side GL_EXT_stencil_wrap GL_EXT_texture3D GL_EXT_texture_compression_s3tc GL_EXT_texture_cube_map GL_EXT_texture_edge_clamp GL_EXT_texture_env_combine GL_EXT_texture_env_dot3 GL_EXT_texture_filter_anisotropic GL_EXT_texture_lod GL_EXT_texture_lod_bias GL_EXT_texture_mirror_clamp GL_EXT_texture_object GL_EXT_vertex_array GL_HP_occlusion_test GL_IBM_rasterpos_clip GL_IBM_texture_mirrored_repeat GL_KTX_buffer_region GL_NV_blend_square GL_NV_centroid_sample GL_NV_copy_depth_to_color GL_NV_depth_clamp GL_NV_fence GL_NV_float_buffer GL_NV_fog_distance GL_NV_fragment_program GL_NV_fragment_program_option GL_NV_fragment_program2 GL_NV_half_float GL_NV_light_max_exponent GL_NV_multisample_filter_hint GL_NV_occlusion_query GL_NV_packed_depth_stencil GL_NV_pixel_data_range GL_NV_point_sprite GL_NV_primitive_restart GL_NV_register_combiners GL_NV_register_combiners2 GL_NV_texgen_reflection GL_NV_texture_compression_vtc GL_NV_texture_env_combine4 GL_NV_texture_expand_normal GL_NV_texture_rectangle GL_NV_texture_shader GL_NV_texture_shader2 GL_NV_texture_shader3 GL_NV_vertex_array_range GL_NV_vertex_array_range2 GL_NV_vertex_program GL_NV_vertex_program1_1 GL_NV_vertex_program2 GL_NV_vertex_program2_option GL_NV_vertex_program3 GL_NVX_conditional_render GL_SGIS_generate_mipmap GL_SGIS_texture_lod GL_SGIX_depth_texture GL_SGIX_shadow GL_SUN_slice_accum GL_WIN_swap_hint WGL_EXT_swap_control 
---------------------------------

Frontbuffer reading speed (back)
---------------------------------

Format: 01 - Speed:  37.9017 Mpix/s  113.705 MB/s

Format: 02 - Speed:  38.142 Mpix/s  152.568 MB/s

Format: 03 - Speed:  38.7782 Mpix/s  116.335 MB/s

Format: 04 - Speed:  38.6662 Mpix/s  154.665 MB/s



Frontbuffer reading speed (front)
---------------------------------

Format: 01 - Speed:  38.0109 Mpix/s  114.033 MB/s

Format: 02 - Speed:  38.2293 Mpix/s  152.917 MB/s

Format: 03 - Speed:  38.6225 Mpix/s  115.868 MB/s

Format: 04 - Speed:  38.7318 Mpix/s  154.927 MB/s



Code: 
[b] Geforce FX 5900 Ultra[/b]


Pete's framebuffer read speed test
Mail: [email]BlackDove@addcom.de[/email]
Homepage: http://home.t-online.de/home/PeteBernert/

Vendor: NVIDIA Corporation
Version: 1.5.0
Renderer: GeForce FX 5900/AGP/SSE/3DNOW!

---------------------------------
OpenGL extensions:
GL_ARB_depth_texture GL_ARB_fragment_program GL_ARB_fragment_program_shadow GL_ARB_imaging GL_ARB_multisample GL_ARB_multitexture GL_ARB_occlusion_query GL_ARB_point_parameters GL_ARB_point_sprite GL_ARB_shadow GL_ARB_texture_border_clamp GL_ARB_texture_compression GL_ARB_texture_cube_map GL_ARB_texture_env_add GL_ARB_texture_env_combine GL_ARB_texture_env_dot3 GL_ARB_texture_mirrored_repeat GL_ARB_transpose_matrix GL_ARB_vertex_buffer_object GL_ARB_vertex_program GL_ARB_window_pos GL_S3_s3tc GL_EXT_texture_env_add GL_EXT_abgr GL_EXT_bgra GL_EXT_blend_color GL_EXT_blend_func_separate GL_EXT_blend_minmax GL_EXT_blend_subtract GL_EXT_compiled_vertex_array GL_EXT_depth_bounds_test GL_EXT_draw_range_elements GL_EXT_fog_coord GL_EXT_multi_draw_arrays GL_EXT_packed_pixels GL_EXT_paletted_texture GL_EXT_pixel_buffer_object GL_EXT_point_parameters GL_EXT_rescale_normal GL_EXT_secondary_color GL_EXT_separate_specular_color GL_EXT_shadow_funcs GL_EXT_shared_texture_palette GL_EXT_stencil_two_side GL_EXT_stencil_wrap GL_EXT_texture3D GL_EXT_texture_compression_s3tc GL_EXT_texture_cube_map GL_EXT_texture_edge_clamp GL_EXT_texture_env_combine GL_EXT_texture_env_dot3 GL_EXT_texture_filter_anisotropic GL_EXT_texture_lod GL_EXT_texture_lod_bias GL_EXT_texture_object GL_EXT_vertex_array GL_HP_occlusion_test GL_IBM_rasterpos_clip GL_IBM_texture_mirrored_repeat GL_KTX_buffer_region GL_NV_blend_square GL_NV_copy_depth_to_color GL_NV_depth_clamp GL_NV_fence GL_NV_float_buffer GL_NV_fog_distance GL_NV_fragment_program GL_NV_fragment_program_option GL_NV_half_float GL_NV_light_max_exponent GL_NV_multisample_filter_hint GL_NV_occlusion_query GL_NV_packed_depth_stencil GL_NV_pixel_data_range GL_NV_point_sprite GL_NV_primitive_restart GL_NV_register_combiners GL_NV_register_combiners2 GL_NV_texgen_reflection GL_NV_texture_compression_vtc GL_NV_texture_env_combine4 GL_NV_texture_expand_normal GL_NV_texture_rectangle GL_NV_texture_shader GL_NV_texture_shader2 GL_NV_texture_shader3 GL_NV_vertex_array_range GL_NV_vertex_array_range2 GL_NV_vertex_program GL_NV_vertex_program1_1 GL_NV_vertex_program2 GL_NV_vertex_program2_option GL_SGIS_generate_mipmap GL_SGIS_texture_lod GL_SGIX_depth_texture GL_SGIX_shadow GL_SUN_slice_accum GL_WIN_swap_hint WGL_EXT_swap_control 
---------------------------------

Frontbuffer reading speed (back)
---------------------------------

Format: 01 - Speed:  49.1738 Mpix/s  147.521 MB/s

Format: 02 - Speed:  40.0631 Mpix/s  160.252 MB/s

Format: 03 - Speed:  48.9775 Mpix/s  146.932 MB/s

Format: 04 - Speed:  40.1419 Mpix/s  160.568 MB/s



Frontbuffer reading speed (front)
---------------------------------

Format: 01 - Speed:  48.1324 Mpix/s  144.397 MB/s

Format: 02 - Speed:  39.8583 Mpix/s  159.433 MB/s

Format: 03 - Speed:  47.9521 Mpix/s  143.856 MB/s

Format: 04 - Speed:  39.7492 Mpix/s  158.997 MB/s
Click to expand...

Could you mod the app, so that it uses a larger frame buffer like 1600x1200 at fullscreen mode?

Thomas
 
Just for comparison:

Vendor: ATI Technologies Inc.
Version: 1.3.4273 Win2000 Release
Renderer: RADEON 8500 DDR x86/SSE

Frontbuffer reading speed (back)
---------------------------------
Format: 01 - Speed: 16.7117 Mpix/s 50.135 MB/s
Format: 02 - Speed: 19.6826 Mpix/s 78.7306 MB/s
Format: 03 - Speed: 16.8676 Mpix/s 50.6029 MB/s
Format: 04 - Speed: 26.7824 Mpix/s 107.13 MB/s

Frontbuffer reading speed (front)
---------------------------------
Format: 01 - Speed: 16.7991 Mpix/s 50.3972 MB/s
Format: 02 - Speed: 19.7086 Mpix/s 78.8344 MB/s
Format: 03 - Speed: 16.8864 Mpix/s 50.6593 MB/s
Format: 04 - Speed: 26.7824 Mpix/s 107.13 MB/s

8500LE 128MB on a Dual PIII-800E / i440BX board - AGP 2X, USWC enabled
 
GameCat said:
The 6800 uses full AGP bandwidth for readbacks, earlier nvidia cards only support PCI read backs. So the scores are still low, you should be able to get around 2GB per second with 8x AGP.

ATI doesn't even reach PCI speeds, but their OpenGL driver does tend to be lacking when it comes to things like this.
Click to expand...

I'm still puzzled by these >500 MB/s readback speeds from the graphics card. I previously read that on AGP 8x, the bandwidth from graphics card to cpu was only PCI or even AGP 1x. I couldn't find out if this was in the spec of AGP 3.0 or an implementation decision by ATI and NVidia.

These figures are very surprising considering the PCI-Express readback speeds that techreport got (~150MB/s for 6800 and ~350MB/s for X800 series). If these figures are not the result of a bug, a lot of people in GPGPU programming will be very happy.
 
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