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Test: CPU Core count and RAM scaling in ACC, AC1 and R3E

Discussion in 'ACC General Discussions' started by Daniel Costa, Aug 20, 2019.

  1. Daniel Costa

    Daniel Costa Racer

    Hello guys

    Couldn't find decent data so I did these tests myself during the holidays.

    • Max settings @ 720P (Max distances, Max shadows, Max mirrors etc) to push for the max cpu drawcalls.
    • Heavy duty multiplayer race replays were used, with 20~30 cars.
    • 1 entire lap per test. With the camera set on the pole car, looking backwards (showing all 30 cars - worse case scenario), at the race start, lasting an entire lap
    • 2 runs per test.

    Test 1

    CPU core count scaling




    Test 2

    HyperThreading ON / OFF scaling




    Test 3

    Ram speed scaling




    If you play offline against AI, none of these results should apply to your situation.



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  3. Daniel Costa

    Daniel Costa Racer

    Here's the entire data if someone wants to confirm the charts

  4. baboon

    baboon Hardcore Simmer

    So ACC doesn't really scale with more than 4cores without AI. Do you think with AI it would be the same?
  5. Daniel Costa

    Daniel Costa Racer

    Well, we learned ACC rendering pipeline needs 4 cores until it starts being bottle-necked by the 1080TI again.

    But I'm pretty sure the AI would cause much much higher CPU usages with much lower FPS than my tests, specially in the 2-4 core counts without HT. But with 6 or 8 cores + hyperthreading ON, I think the framerates would be approximate to what I tested. I'm speculating. This needs another round of tests but I never play offline.
    alex bonner, baboon and gdavis626 like this.
  6. chksix

    chksix Simracer

    Awesome test!
    alex bonner and Daniel Costa like this.
  7. I can confirm this :) The change from I5-4670K to I7-4790K was a huge performance boost especially online and against the AI.
    AurusCE, Daniel Costa and Coanda like this.
  8. deadmeat2k

    deadmeat2k Racer

    Very nicely done :cool: and interesting to see the negative effect of HT.
  9. jaykinch

    jaykinch Gamer

    I was getting (not tested for a while ) huge stutter problems when I had ht turned off in vr
  10. Daniel Costa

    Daniel Costa Racer

    With your CPU, HT off means that you only have 4 threads to handle the game + windows and apps. Even though my tests show HT = OFF is the better result, it does not have into account VR and other apps you might have open in the background. So it makes sense you have stutters.
    After_Midnight likes this.

    FLATPAT Rookie

    Interesting test, thank you for posting this

    So 4 cores without HT are faster that 8 cores with HT. ...d@mn
    and 5 cores without HT gives the overall best result. ...stunning.

    In general i wonder if this is the result of a non-optimized unreal engine (i think so) or something that maybe Kunos could adjust in future.

    Did you have disabled HT and cores in the BIOS or with a software tool?
  12. Daniel Costa

    Daniel Costa Racer

    All changes were directly in the BIOS.
  13. Daniel Costa

    Daniel Costa Racer

  14. Also online racing is very demanding in ACC. Rendering cars similar to races against the AI. HT brings also online a huge performance boost in my case. Always related to the I7-4790K.
  15. Lord Kunos

    Lord Kunos His master's voice. Staff Member KS Dev Team

    In case of AC/ACC then it's not really very representative of the actual online playing.
    In replay all the physics threads are stopped so you are really only testing the graphics engine performance, not dissimilar from the AC benchmark mode (also a replay). So HT results are to be taken for what they are, especially in AC where you're basically running a single threaded app in that scenario.
  16. Lord Kunos is right, a benchmark feature in-game running full physics would help to obtain more accurate results :D
  17. Daniel Costa

    Daniel Costa Racer

    I see. Thanks
  18. Berniyh

    Berniyh Alien

    I think that if – designed right (basically add a huge number of AI cars) – ACC could be a very nice gaming benchmark for the CPU, but with the given possibilities the CPU is rarely limiting, so it's not so much of an issue anyway.
  19. Coanda

    Coanda Alien

    I am curious. Lets say one game likes HT and one game does not. Is there any software that can disabled/enabled HT per game? Currently I only know how to enable/disable HT via the bios.
  20. Max Doubt

    Max Doubt Racer

    You can use the task manager by finding the process in details when running, not very convenient but maybe easier than bios

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