Minimum Haswell CPU clockspeed for 3k 60fps gaming

Discussion in 'Hardware Components and Aftermarket Upgrades' started by Arthedes, May 18, 2015.

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Whats your Haswell CPU clockspeed in GHz for gaming?

  1. higher? please consider posting below.

    0 vote(s)
    0.0%
  2. 4.3-4.5

    10.0%
  3. 4.0-4.2

    10.0%
  4. 3.9-4.0

    25.0%
  5. 3.7-3.8

    10.0%
  6. 3.5-3.6

    20.0%
  7. 3.3-3.4

    20.0%
  8. 3.0-3.2

    15.0%
  9. 2.5-3.0

    15.0%
  10. lower? please consider posting below.

    0 vote(s)
    0.0%
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  1. D2 Ultima

    D2 Ultima Livestreaming Master

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    Doesn't the CPU still require drawing those "thin frames" first? Shouldn't a larger "thin frame" help? I've seen more CPU leeway by dropping resolution before, where I was CPU bound (and not GPU bound) at 1080p I would drop to 720p, keep the same GPU util and get lower CPU usage.
     
  2. octiceps

    octiceps Nimrod

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    What in the world is a "thin frame"?
     
  3. D2 Ultima

    D2 Ultima Livestreaming Master

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    I don't know the name of it. But you know what I'm talking about. The CPU renders a very basic frame and pushes it to the GPU to fill out. If the CPU can't render fast enough to utilize the GPUs, then you hit a CPU bottleneck. If the GPUs can't fill out all the frames the CPUs are pushing, then you hit a GPU bottleneck.
     
  4. octiceps

    octiceps Nimrod

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    Well the CPU handles all the game's simulation and draw calls for each frame. It doesn't actually render any of the pixels, that's all on the GPU. So resolution is entirely GPU-dependent. But if the CPU needs to update its simulation more times per second because the GPU is able to output a higher FPS due to lowering resolution, then CPU usage increases.
     
  5. D2 Ultima

    D2 Ultima Livestreaming Master

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    I really need to do some more testing of that, then. I need to find a game that's CPU-limited AND locked to say... 60fps (and dips below 60 due to CPU bottleneck) then drop it to 720p and see if it still dips below 60.

    If higher resolutions don't use more CPU power at all, then regardless of resolution, a CPU bottleneck is a CPU bottleneck. The parts where I drop from 60fps should still drop at 720p, because the CPU is the bottleneck, not the GPU. Does that make sense? If I don't get CPU limited at lower resolutions the same as at higher ones, then it should prove higher resolutions use more CPU power.
     
  6. octiceps

    octiceps Nimrod

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    Yes
     
  7. D2 Ultima

    D2 Ultima Livestreaming Master

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    Okay, when I stop being lazy I'll check with some game or other XD
     
    Papusan likes this.
  8. D2 Ultima

    D2 Ultima Livestreaming Master

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    Okay, so I stopped being lazy and I checked using GTA V. Seems there's a VERY SLIGHT improvement between 1080p and 720p (using windowed mode). At 720p the GPU util plummets and I get ~2-3 frames more on average. I was just standing at one spot for quite a while. Minimum FPS was 62 and max was 68 at 1080p, and minimum FPS was 64 and max was 71 at 720p. It was so slight it was very little to be concerned about, but I'm not sure what the jump to 4K would be like. I was looking for one of those instances where I got locked to about 44fps, but apparently they patched it and it runs better now. I was legit amazed at the performance I was getting; I didn't go under 60 when I was trying to find a place to go under 60 XD
     
  9. octiceps

    octiceps Nimrod

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    So this proves you're CPU-bound in GTA V
     
    Last edited: Jun 17, 2015
  10. D2 Ultima

    D2 Ultima Livestreaming Master

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    Oh I knew I was the whole time, which is why I said 3.5GHz is not enough for GTA. But those underwater features where I was using 15% of the CPU? No.

    Also, funnily enough... GTA V can use legit 99% of the CPU (and I do mean ~98-100% of all 8 threads; throttlestop saying C0% is 99%) when first starting up. After it loads its title screen etc it seems to get locked to ~62% in-game. XD
     
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