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Adept III

clinfo claims my Radeon HD 6970 has no cache

According to clinfo output, my Radeon HD 6970 (lspci -nn output: 01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Cayman XT [Radeon HD 6970] [1002:6718]) has no global cache. This is using Catalyst drivers, version 13.4. Is this an actual device limitation or a bug in the driver? The full clinfo output follows:

  Device Type: CL_DEVICE_TYPE_GPU   Device ID: 4098   Board name: AMD Radeon HD 6900 Series   Device Topology: PCI[ B#1, D#0, F#0 ]   Max compute units: 24   Max work items dimensions: 3     Max work items[0]: 256     Max work items[1]: 256     Max work items[2]: 256   Max work group size: 256   Preferred vector width char: 16   Preferred vector width short: 8   Preferred vector width int: 4   Preferred vector width long: 2   Preferred vector width float: 4   Preferred vector width double: 2   Native vector width char: 16   Native vector width short: 8   Native vector width int: 4   Native vector width long: 2   Native vector width float: 4   Native vector width double: 2   Max clock frequency: 880Mhz   Address bits: 32   Max memory allocation: 268435456   Image support: Yes   Max number of images read arguments: 128   Max number of images write arguments: 8   Max image 2D width: 16384   Max image 2D height: 16384   Max image 3D width: 2048   Max image 3D height: 2048   Max image 3D depth: 2048   Max samplers within kernel: 16   Max size of kernel argument: 1024   Alignment (bits) of base address: 2048   Minimum alignment (bytes) for any datatype: 128   Single precision floating point capability     Denorms: No     Quiet NaNs: Yes     Round to nearest even: Yes     Round to zero: Yes     Round to +ve and infinity: Yes     IEEE754-2008 fused multiply-add: Yes   Cache type: None   Cache line size: 0   Cache size: 0   Global memory size: 1073741824   Constant buffer size: 65536   Max number of constant args: 8   Local memory type: Scratchpad   Local memory size: 32768   Kernel Preferred work group size multiple: 64   Error correction support: 0   Unified memory for Host and Device: 0   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: 0x7f5d4d6ba520   Name: Cayman   Vendor: Advanced Micro Devices, Inc.   Device OpenCL C version: OpenCL C 1.2   Driver version: 1124.2   Profile: FULL_PROFILE   Version: OpenCL 1.2 AMD-APP (1124.2)   Extensions: cl_khr_fp64 cl_amd_fp64 cl_khr_global_int32_base_atomics cl_khr_global_int32_extended_atomics cl_khr_local_int32_base_atomics cl_khr_local_int32_extended_atomics cl_khr_3d_image_writes cl_khr_byte_addressable_store cl_khr_gl_sharing cl_ext_atomic_counters_32 cl_amd_device_attribute_query cl_amd_vec3 cl_amd_printf cl_amd_media_ops cl_amd_media_ops2 cl_amd_popcnt 
3 Replies

well, it certainly is a bug in driver. The card certainly has caches. Can you check with 13.6 driver once.


Did you try with the latest Catalyst drivers?  Does it work now?


Hello, I just tested with the latest stable (14.4) and they still report None as Global Memory cache type.