My GPU is a VGA Asus EN8400GS Silent/HTP/256M.  It cost $30.99 from NewEgg in April of 2009.  I tried the detection with just the first 10 images and got the same assertion failure.

When using the "check" box under GPU processing, in the Render tab both pictures look the same.  I will paste below the text from the Info tab.

OGL Version: 2.1 Mesa 8.0.2
Render: Gallium 0.4 on NV98
Vendor: nouveau
Shader Version: 1.20
MaxTextureSize: 8192
MaxTextureUnits: 8
MaxColorAttachement: 8
MaxRenderBufferSize: 16384
Extentions:
    GL_APPLE_packed_pixels
    GL_APPLE_vertex_array_object
    GL_ARB_ES2_compatibility
    GL_ARB_color_buffer_float
    GL_ARB_copy_buffer
    GL_ARB_depth_buffer_float
    GL_ARB_depth_clamp
    GL_ARB_depth_texture
    GL_ARB_draw_buffers
    GL_ARB_draw_elements_base_vertex
    GL_ARB_draw_instanced
    GL_ARB_explicit_attrib_location
    GL_ARB_fragment_coord_conventions
    GL_ARB_fragment_program
    GL_ARB_fragment_program_shadow
    GL_ARB_fragment_shader
    GL_ARB_framebuffer_object
    GL_ARB_framebuffer_sRGB
    GL_ARB_half_float_pixel
    GL_ARB_half_float_vertex
    GL_ARB_instanced_arrays
    GL_ARB_map_buffer_range
    GL_ARB_multisample
    GL_ARB_multitexture
    GL_ARB_occlusion_query
    GL_ARB_occlusion_query2
    GL_ARB_pixel_buffer_object
    GL_ARB_point_parameters
    GL_ARB_point_sprite
    GL_ARB_provoking_vertex
    GL_ARB_robustness
    GL_ARB_sampler_objects
    GL_ARB_shader_objects
    GL_ARB_shader_texture_lod
    GL_ARB_shading_language_100
    GL_ARB_shadow
    GL_ARB_sync
    GL_ARB_texture_border_clamp
    GL_ARB_texture_compression
    GL_ARB_texture_compression_rgtc
    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_float
    GL_ARB_texture_mirrored_repeat
    GL_ARB_texture_non_power_of_two
    GL_ARB_texture_rectangle
    GL_ARB_texture_rg
    GL_ARB_texture_storage
    GL_ARB_texture_swizzle
    GL_ARB_transpose_matrix
    GL_ARB_vertex_array_bgra
    GL_ARB_vertex_array_object
    GL_ARB_vertex_buffer_object
    GL_ARB_vertex_program
    GL_ARB_vertex_shader
    GL_ARB_window_pos
    GL_ATI_blend_equation_separate
    GL_ATI_draw_buffers
    GL_ATI_separate_stencil
    GL_ATI_texture_compression_3dc
    GL_ATI_texture_env_combine3
    GL_ATI_texture_float
    GL_ATI_texture_mirror_once
    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_copy_texture
    GL_EXT_draw_buffers2
    GL_EXT_draw_instanced
    GL_EXT_draw_range_elements
    GL_EXT_fog_coord
    GL_EXT_framebuffer_blit
    GL_EXT_framebuffer_multisample
    GL_EXT_framebuffer_object
    GL_EXT_framebuffer_sRGB
    GL_EXT_gpu_program_parameters
    GL_EXT_multi_draw_arrays
    GL_EXT_packed_depth_stencil
    GL_EXT_packed_float
    GL_EXT_packed_pixels
    GL_EXT_pixel_buffer_object
    GL_EXT_point_parameters
    GL_EXT_polygon_offset
    GL_EXT_provoking_vertex
    GL_EXT_rescale_normal
    GL_EXT_secondary_color
    GL_EXT_separate_shader_objects
    GL_EXT_separate_specular_color
    GL_EXT_shadow_funcs
    GL_EXT_stencil_two_side
    GL_EXT_stencil_wrap
    GL_EXT_subtexture
    GL_EXT_texture
    GL_EXT_texture3D
    GL_EXT_texture_compression_latc
    GL_EXT_texture_compression_rgtc
    GL_EXT_texture_cube_map
    GL_EXT_texture_edge_clamp
    GL_EXT_texture_env_add
    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_texture_sRGB
    GL_EXT_texture_sRGB_decode
    GL_EXT_texture_shared_exponent
    GL_EXT_texture_snorm
    GL_EXT_texture_swizzle
    GL_EXT_timer_query
    GL_EXT_vertex_array
    GL_EXT_vertex_array_bgra
    GL_IBM_multimode_draw_arrays
    GL_IBM_rasterpos_clip
    GL_IBM_texture_mirrored_repeat
    GL_INGR_blend_func_separate
    GL_MESA_pack_invert
    GL_MESA_texture_signed_rgba
    GL_MESA_window_pos
    GL_NV_blend_square
    GL_NV_conditional_render
    GL_NV_depth_clamp
    GL_NV_fog_distance
    GL_NV_light_max_exponent
    GL_NV_packed_depth_stencil
    GL_NV_primitive_restart
    GL_NV_texgen_reflection
    GL_NV_texture_barrier
    GL_NV_texture_env_combine4
    GL_NV_texture_rectangle
    GL_OES_EGL_image
    GL_OES_read_format
    GL_SGIS_generate_mipmap
    GL_SGIS_texture_border_clamp
    GL_SGIS_texture_edge_clamp
    GL_SGIS_texture_lod
    GL_SUN_multi_draw_arrays