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Raistmer
Adept II

beta support of 4xxx GPUs in SDK 2.2

what exactly in beta?

Device Type: CL_DEVICE_TYPE_GPU
Device ID: 4098
Max compute units: 10
Max work group size: 256
Max clock frequency: 750Mhz
Address bits: 32
Max memory allocation: 134217728
Image support: No
Max size of kernel argument: 1024
Alignment (bits) of base address: 32768
Minimum alignment (bytes) for any datatype: 128
Cache type: None
Cache line size: 0
Cache size: 0
Global memory size: 536870912
Constant buffer size: 65536
Max number of constant args: 8
Local memory type: Global
Local memory size: 16384
Profiling timer resolution: 1
Device endianess: Little
Available: Yes
Compiler available: Yes
Execution capabilities:
Execute OpenCL kernels: Yes
Execute native function: No
Queue properties:
Out-of-Order: No
Profiling : Yes
Platform ID: 02B4D40C
Name: ATI RV770
Vendor: Advanced Micro Devices, Inc.
Driver version: CAL 1.4.739
Profile: FULL_PROFILE
Version: OpenCL 1.0 ATI-Stream-v2.2 (302)
Extensions: cl_khr_icd cl_amd_fp64 cl_khr_gl_sharing cl_amd_device_attribute_query cl_khr_d3d10_sharing

When bold No become "Yes" ? Will image support be added for 4xxx cards and at what SDK release? What about native functions ? What about binary kernels, will they work for HD4xxx ?
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MicahVillmow
Staff
Staff

beta support of 4xxx GPUs in SDK 2.2

Raistmer,
Because of hardware limitations, there is no plan on adding images to the 4XXX series of cards.
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Raistmer
Adept II

beta support of 4xxx GPUs in SDK 2.2

Originally posted by: MicahVillmow

Raistmer,

Because of hardware limitations, there is no plan on adding images to the 4XXX series of cards.


Should this be read as "Although HD4xxx has shared memory and texture cache we never will expose these hardware resources via OpenCL" ?

What hardware limitation prevents image support? In what part OpenCL image differs from let say Brook's ordinal (not gather and not scatter) stream so much that it can't be supported by RV770 hardware?

Such approach just throw out all fast GPU memory besides registers themselves ...
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MicahVillmow
Staff
Staff

beta support of 4xxx GPUs in SDK 2.2

Raistmer,
If image support only was for the streaming model, then it could be supported on HD4XXX. However, there are many issues with the OpenCL spec that 4XXX does not comply with. For example, on 8XX hardware there is support for scatter based typed surfaces(write_only images), but this does not exist on 7XX hardware, so write_only images can not be supported in hardware, and that is required for 'image' support.
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Raistmer
Adept II

beta support of 4xxx GPUs in SDK 2.2

Maybe it's possible to open access to texture cache on HD4xxx via some AMD-specific OpenCL extensions? Let they be more limited then OpenCL image, but at least for some algorithms fast cache memory could be used. It's a shame to have fast memory onboard and have no ability to use it, especially for memory-bound apps like I working on ...
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