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When does a CPU hold back 4k resolutions

Discussion in 'CPUs' started by bakes0310, May 4, 2019.

  1. bakes0310

    Capodecina

    Joined: Oct 22, 2004

    Posts: 12,008

    As title I keep seeing GPU is more important as it's more GPU bound at 4k when people want to get better performance out of their games at 4k.
    Some people are still running 2500k and are being recommended to keep them overclocked and get a better GPU. But when does it get to a point that a CPU must be upgraded to get better frame rates in 4k gaming?

    In a funny way 4k could be a good platform to have if your on lowish budget as you will just need to upgrade your GPU if you have a 5 year old system already. I know GPUs are expensive but you could be quite happy on a Vega 56 or a Nvidia 1080.

    I don't have 4k yet myself so this is just coming from stuff I read on here and lots of YouTube reviews.
     
  2. youdsy

    Wise Guy

    Joined: Feb 14, 2011

    Posts: 2,416

    Probably when GPU are able to hit 100+ FPS @ 4K.

    a first gen i7 will suffice @ 4K as its all down to GPU and most GPU's struggle to hit 60fps.
     
  3. HRL

    Hitman

    Joined: Nov 22, 2005

    Posts: 851

    Location: London

    I’d imagine you’d need to upgrade the CPU once the GPU is able to hit high frame rates. At least significantly higher than 60/70 which is where we’re typically at with all the bells and whistles switched on with a 2080Ti on current games.
     
  4. markoboyo11

    Wise Guy

    Joined: May 3, 2007

    Posts: 1,138

    My 4670k at 4.4ghz bottlenecks some games at 4k with a 1080ti.

    Only in the last year has cpu struggled tho, newer games just tank it. Eg metro exodus and assetto corsa comp just a couple I can think of right now.

    Roll on new ryzen.
     
    Last edited: May 4, 2019
  5. bakes0310

    Capodecina

    Joined: Oct 22, 2004

    Posts: 12,008

    I'm hoping my 6700k can handle 4k as I think funds will need to go on the GPU.
     
  6. shamus21

    Wise Guy

    Joined: Aug 29, 2004

    Posts: 1,618

    Location: Alpha centauri

    It will be a good few years yet before most gamers will need to buy a new cpu for 4K gaming. Do not forget developers design games for consoles first and the add a few extras on for the pc gamer
     
  7. CuriousTomCat

    Hitman

    Joined: Nov 22, 2018

    Posts: 530

    4k needs some very serious GPU grunt to handle everything. Even modern GPUs can struggle, so a good CPU wont get the chance to work to it's full potential because it's held back by the GPU.

    A CPU will hold back 4k when AMD/Nvidia release fast enough GPUs that can handle 4k very easily.
     
    Last edited: May 4, 2019
  8. Murphy

    Wise Guy

    Joined: Sep 16, 2018

    Posts: 1,240

    To answer the OP it would be when the CPU can't keep up with issuing draw calls, that obviously depends on the CPU if we're talking about 4k.

    Basically one or the other, CPU or GPU, will (should) always be at 100% load, or close to it, and that's where the bottleneck is.
     
  9. shamus21

    Wise Guy

    Joined: Aug 29, 2004

    Posts: 1,618

    Location: Alpha centauri

    Also one of the reasons why it is not worth paying out £500 for a 9900k it will be just sitting there waiting for the Gpu most of the time. If 4K gaming is all that interests you and you have a 1080ti / 2080ti just go with a low end Cpu like the i5 8400 /amd 2600 and just upgrade the Cpu when you start having Bottlenecks with newer gen cards.
     
  10. Sh4rkie

    Wise Guy

    Joined: Mar 26, 2007

    Posts: 1,381

    The 6700k certainly handles everything i play without issue @ 4k!
     
  11. seanyc5

    Hitman

    Joined: Nov 30, 2011

    Posts: 818

    Same here!
     
  12. bakes0310

    Capodecina

    Joined: Oct 22, 2004

    Posts: 12,008

    Glad to hear that my 6700k will be happy with 4k. Just means I'll just need to update the graphics card, hopefully not straight away though as the 1080 seems a pretty good card.
     
  13. sunshinewelly

    Gangster

    Joined: Nov 3, 2010

    Posts: 391

    My i5 3750 struggles now in assassin's creed odyssey hence why I am now upgrading .
     
  14. bakes0310

    Capodecina

    Joined: Oct 22, 2004

    Posts: 12,008

    From what I've seen on hardware unboxed assassin creed, far cry and hitman don't do well with CPU usage especially Ryzen.
     
  15. ToTheMax

    Hitman

    Joined: Nov 28, 2012

    Posts: 592

    I'm on a 6700K with a 1080ti both overclocked and running at 4K, there is literally no point in upgrading. Once we see 120Hz 4K panels becoming readily available then that'll be the upgrade point imo.
     
  16. Grim5

    Hitman

    Joined: Feb 6, 2019

    Posts: 628

    Rule of thumb from my own testing

    4k resolution

    Under 60fps = GPU bottleneck
    Between 60 and 79fps = grey area
    80fps or higher = CPU bottleneck starts to creep in

    For most people this won't be an issue because they aren't going to get 80+fps at 4k anyway, so as long as you're at or under 60 with a gpu bottleneck then even a super old CPU will be fine.

    Based on what I'd said here - and also my own testing, there are some games (not that many) where the 2080ti can hit high framerates, for instance mine can do 100fps at max settings in Resident Evil 2 remake. The 1080ti would be a better fit for a CPU like that, 2080ti I'd say yes you will hit a bottleneck in those games I mentioned that can hit high framerates at 4k. Next gen will be the watershed where your CPU absolutely matters at 4k if you plan on owning a 3080ti or equivalent
     
  17. MaXxBoulton

    Hitman

    Joined: Jan 11, 2019

    Posts: 778

    Location: Dagobah system

    i like to see threads like this. some actual real advice and not just a bunch of people says throw money at a CPU.
    normally within a post of two there is someone saying you need a 9900k at 5ghz to game at 4k....

    in the real world a 6700k at stock speeds will do 4k games all day long, so yours running at 4.4ghz(all cores?) i would think as a year or two left in it yet
     
  18. MaXxBoulton

    Hitman

    Joined: Jan 11, 2019

    Posts: 778

    Location: Dagobah system

    max setting?
     
  19. bakes0310

    Capodecina

    Joined: Oct 22, 2004

    Posts: 12,008

    Is it accurate that you can game with no to very little AA on as 4k doesn't show jaggies like it does on other resolutions. If that's true that must be quite a few FPS saved?
     
  20. Distracted

    Wise Guy

    Joined: Aug 30, 2018

    Posts: 2,122

    I have heard this mentioned and in theory it stands to reason that it would be true. The higher pixel density should make jaggies hard to see. But I have never tested it myself. I would also be interested to hear whether users here bother with AA at 4k?