Am I running my graphics card at 5 GT/s?

Discussion in 'Mac Pro' started by mtasquared, Sep 27, 2013.

  1. mtasquared macrumors regular


    May 3, 2012
    I am running a GTX 760, unflashed. I'm staring at the CUDA-Z output and after googling a bit I think I'm running 5 GT/s and at full clocks but I'm not sure! Please chime in if you can interpret this bunch of numbers. :confused:

    CUDA-Z Report
    Version: 0.7.184
    OS Version: Mac OS X 10.8.5 12F37
    Driver Version: 8.16.74 310.40.00.10f02
    Driver Dll Version: 5.50
    Runtime Dll Version: 5.0

    Core Information
    Name: GK104
    Compute Capability: 3.0
    Clock Rate: 1124 MHz
    PCI Location: 0:6:0
    Multiprocessors: 6 (1152 Cores)
    Therds Per Multiproc.: 2048
    Warp Size: 32
    Regs Per Block: 65536
    Threads Per Block: 1024
    Threads Dimensions: 1024 x 1024 x 64
    Grid Dimensions: 2147483647 x 65535 x 65535
    Watchdog Enabled: Yes
    Integrated GPU: No
    Concurrent Kernels: Yes
    Compute Mode: Default

    Memory Information
    Total Global: 2047.81 MiB
    Bus Width: 256 bits
    Clock Rate: 3004 MHz
    Error Correction: No
    L2 Cache Size: 48 KiB
    Shared Per Block: 48 KiB
    Pitch: 2048 MiB
    Total Constant: 64 KiB
    Texture Alignment: 512 B
    Texture 1D Size: 65536
    Texture 2D Size: 65536 x 65536
    Texture 3D Size: 4096 x 4096 x 4096
    GPU Overlap: Yes
    Map Host Memory: Yes
    Unified Addressing: No
    Async Engine: Yes, Unidirectional

    Performance Information
    Memory Copy
    Host Pinned to Device: 5597.19 MiB/s
    Host Pageable to Device: 5250.99 MiB/s
    Device to Host Pinned: 6315.58 MiB/s
    Device to Host Pageable: 5450.8 MiB/s
    Device to Device: 66.6016 GiB/s
    GPU Core Performance
    Single-precision Float: 1599.19 Gflop/s
    Double-precision Float: 115.221 Gflop/s
    32-bit Integer: 458.761 Giop/s
    24-bit Integer: 458.078 Giop/s

    Generated: Fri Sep 27 20:05:11 2013
  2. flowrider macrumors 603


    Nov 23, 2012
    You need to:

    1. Go to "About This Mac - Under the Apple on the far left.

    2. Click on "More Info" toward the bottom of the box.

    3. Click on "System Report" on the left side of the box.

    4. Scroll down to PCI Cards.

    5. The fist item on the list should be the Video card, look below it and you'll see something that looks like the attached.

    6. Look at "Link Speed"


    Attached Files:

    • shot.jpg
      File size:
      39.1 KB
  3. mtasquared thread starter macrumors regular


    May 3, 2012

    Thanks Lou, but I tried that and it says "There was an error while gathering PCI card information."

    I googled this more and apparently there is a very messy way of checking the link speed involving stressing the card and using a utility to check link state at the same time. Something to do tomorrow, if no quick answer.:)
  4. N19h7m4r3 macrumors 65816


    Dec 15, 2012
    That means you don't have a card with an EFI ROM. Mine says the exact same because I'm using a GTX 660.
  5. m4v3r1ck macrumors 68020


    Nov 2, 2011
    The Netherlands
    And for the GTX670FTW the same! ;)
  6. flowrider macrumors 603


    Nov 23, 2012
    Yep - That's what it means!

  7. RoastingPig macrumors 68000


    Jul 23, 2012
    if your running the web driver than yes it's at 5.0...can't guarantee that with native osx drivers though
  8. N19h7m4r3 macrumors 65816


    Dec 15, 2012
    The latest web drivers from NVIIDA keep giving my Graphics Kernal crashing in FCPX and iMovie. Went back to the OS X drivers.
  9. mtasquared thread starter macrumors regular


    May 3, 2012
    Cool, thanks for the info, guys!

    I'll try to figure out what speed I am at using OSX drivers before switching to web drivers.

    I guess the cuda-z output wasn't helpful?

    I don't know why I shouldn't have the same issues as other non-EFI cards regarding link speed and clock rates. Just think I'm special :p
  10. xcodeSyn macrumors 6502a

    Nov 25, 2012
    If you know that 5 GT/s is equivalent to 4 Gb/s or 500 MB/s, then you can easily figure out that for PCI e 2.0 x16, the theoretical transfer rate is 8000 MB/s or 7629 MiB/s. Given that your CUDA-Z results indicated 5597.19 MiB/s and 6315.58 MiB/s for Host to Device and Device to Host performance, it's clear that they are within the PCIe 2.0 range since the PCIe 1.1 x16 spec is only up to 4000 MB/s or 3814 MiB/s.
  11. mtasquared thread starter macrumors regular


    May 3, 2012
    Thanks xcodeSyn! That's what I thought, but I wasn't sure. So, in a nutshell, under OSX 10.8.5 the 760 runs at PCIe 2.0, full gpu and memory clocks, 5GT/s. What you lose is EFI boot screen only. On the Windows side, I find that it runs at full gpu and memory clocks but only PCIe 1.1 speeds (see below). The internet says I'm below PCIe 1.1 bandwidth limits but 2.0 speeds would be slightly better. Can't say I can do anything about it though, so I think I'll just go play Crysis 3 now. Thanks, guys!


    Uploaded with

Share This Page