MacPro 2013 ATI D700 clock speed is 150 MHz?

Question

While trying to benchmark OpenCL performance, I noticed that the "LuxMark" benchmark is showing one of the D700 graphics cards clocked at only 150 MHz.Should one of the D700 cards be clocking at 150 MHz while the other is clocking at 850 MHz?My benchmarks results are proving much slower than expected as well.  Is there something wrong with my Mac Pro?In the System Information app, I see both AMD FirePro D700 cards in Slot-1 and Slot-2 with the following details:AMD FirePro D700:  Chipset Model:          AMD FirePro D700  Type:          GPU  Bus:          PCIe  Slot:          Slot-1  PCIe Lane Width:          x16  VRAM (Total):          6144 MB  Vendor:          ATI (0x1002)  Device ID:          0x6798  Revision ID:          0x0000  ROM Revision:          113-C3861J-687  gMux Version:          4.0.11 [3.2.8]  EFI Driver Version:          01.00.687AMD FirePro D700:  Chipset Model:          AMD FirePro D700  Type:          GPU  Bus:          PCIe  Slot:          Slot-2  PCIe Lane Width:          x16  VRAM (Total):          6144 MB  Vendor:          ATI (0x1002)  Device ID:          0x6798  Revision ID:          0x0000  ROM Revision:          113-C3861J-687  gMux Version:          4.0.11 [3.2.8]  EFI Driver Version:          01.00.687  Displays:Thunderbolt Display:  Display Type:          LCD  Resolution:          2560 x 1440  Pixel Depth:          32-Bit Color (ARGB8888)  Display Serial Number:          C02G203CDJGR  Main Display:          Yes  Mirror:          Off  Online:          Yes  Rotation:          Supported  Connection Type:          DisplayPort

mdopp · Answer

Don&#x27;t worry - this seems to be an error of LuxMark. I had the same with my MacPro and 2xD700.When I ran each graphics card individually the results were nearly identical.Both GPUs combined gave me 29927, the CPU alone was 6945 (8-core) and everything in parallel resulted in a score of 36088.

FabrizioRizzo · Answer

Thanks mdopp.  For the "salsa" scene, my results are fairly even, so I think I can confirm that the clock speed readout is bogus for the 2nd GPU.Which scene did you use to get the +29000 score?

mdopp · Answer

My score was for LuxBallHDR.

FabrizioRizzo · Answer

Ok.  I&#x27;m getting 29940 (gpu only)  and 36788 (gpu + 12-core cpu)  for LuxBallHDR. :-)  Thanks.  I&#x27;m much more confident that things are working correctly now and any perceived "deficiencies" are likely with the benchmark or tool&#x27;s OpenCL implementation (or all in my head).

FabrizioRizzo · Answer

Ok, looking at the luxmark db and scores for the LuxBallHDR scene render, we&#x27;re still an order of magnitude slower than a lot of folks...Overall Top 20 Simple Benchmark ("LuxBall HDR" scene)Pos.          Score          Submission Date        Mode          Device Count        Device Name(s)          User1       221,561       2012-12-04 06:31:23  GPU          2                            2xGeForce GTX 670 [28 units @ 705MHz]2       205,958       2012-10-27 02:22:40  GPU          2                            2xGeForce GTX 680 [32 units @ 705MHz] 3       148,646       2013-01-06 16:23:39  GPU          1                            GeForce GTX 580 [64 units @ 1800MHz] 4       111,550       2012-11-02 01:04:24   GPU          1                            GeForce GTX 680 [32 units @ 705MHz]5       100,241      2012-10-07 06:01:05   GPU          1                            GeForce GTX 670 [28 units @ 705MHz]Are the AMD D700 THAT much slower than a GeForce GTX  running a comparable # of compute units at similar speeds?   ...  29,940       ....         GPU  2                 AMD Radeon HD - FirePro D700 [32 units @ 850MHz]

FabrizioRizzo · Answer

Just found out that many of the luxmark db entries are totally faked.  not worrying about it anymore.