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krisd20407581
krisd20407581
Participating Frequently
October 11, 2018
Question

Please help me interpret these benchmark results

  • October 11, 2018
  • 1 reply
  • 748 views

PPBM - I've been trying to do this test seemingly for years - i keep coming back to it once a year or so but there's always some issue, both with the site and figuring out how to run it and generate results. I finally got it to generate some results, but i have no idea how to interpret them. The PPBM site is kind of a mess and the PPBM charts don't display (even though the top 25, 26-50 do for whatever reason after updating/installing Adobe flash 6). I think the original creator has passed and i don't mean any disrespect, but i really have no frame of reference for interpreting these results that i've stayed up half the night trying to generate.

Disk I/O = 298 seconds

Premiere Disk write rate: 124.47 MB/s

H264 timeline = 386 seconds

MPE gain 589/49=12

i7 2600k @ 4.6GHz

32gb RAM

GTX750ti

project disk is m.2 drive getting up to  1300MB/s sequential read and OS drive is a regular SATA SSD.

Any help would be greatly appreciated. Or if anyone could just post screenshots of the charts i'm supposed to be looking at, because i can't view the main ones.

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    1 reply

    R
    RjL190365
    Legend
    October 11, 2018

    Although your MPEG-2 export results look about right for your CPU and GPU, your Disk I/O and H.264 results are skewed: The 6- and 7-series Intel chipsets do not natively support m.2 at all, requiring third-party controllers to even add this support. You are likely using a PCIe adapter card for m.2 devices, and you likely installed the card in a PCIe 2.0 x1 slot, resulting in a maximum sequential read speed of less than 500 MB/s for that m.2 SSD. And you may be writing those files onto your OS SSD, which with all of the OS housekeeping tasks being constantly performed on it that the effective disk I/O performance on that disk is substantially slower than it should have been. That not only skews the disk I/O score, but also causes the H.264 score to suffer. Normally, with that GPU the H.264 score should have been 140-ish seconds, based on my past experience with that GPU.

    krisd20407581
    krisd20407581Author
    Participating Frequently
    October 11, 2018

    Yea it is an Asus PCIe adapter, but it's in a 2.0  x16 slot, which i believe is running at x8 - my GPU is in the first x16 slot. CrystalDiskMark gives me a sequential read of 1270MB/s currently and a write of 866MB/s.

    What do you mean writing to the OS SSD? I have my Cache/Previews/Project/Footage all being read/written from the M.2 SSD. My OS and programs are on the slower SSD.

    My OS SSD is nearly full but i'm still getting 516MB/s seq read and 121MB/s write

    R
    RjL190365
    Legend
    October 11, 2018

    In your case, the GPU only gets fed eight PCIe 2.0 lanes instead of the normal 16. Although that does not impact the performance of that GTX 750 Ti per se, the Asus PCIe m.2 adapter may have used a chipset that does not perform well in full-duplex transfers. And no amount of tweaking or driver optimizations would have fixed that.

    By the way, the adapter only uses four PCIe lanes electrically, whether PCIe 2.0 or 3.0. This limits the maximum throughput of that adapter in your system to less than 2 GB/s sequentially, effectively halving the advertised maximum throughput of your particular m.2 SSD according to your benchmarks.

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