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21:9 increase CPU Limited ? - Page 3

post #21 of 49
Quote:
The effect is smaller, but the faster the videocard, the faster your CPU needs to be for it not to bottleneck it.

I think the best, and simplest way to say this:

If you're at 50fps in both cases, CPU load will probably be basically identical

If you double GPU power and resolution and still have 50fps, CPU is probably about the same load

If you demand 100fps from your system, CPU load will probably go up a >lot< (as much as double, as it needs to output twice as much FPS)


If your CPU is capable of 120fps and you run a GPU powerful enough to get 120fps, you could see 100% CPU load. If you run a GPU that's only capable of 60fps though, your CPU would be idle half of the time as it's "only" dealing with 60fps

Generally speaking, the more performance you want (in terms of FPS etc) the more you have to worry about CPU. It's a big deal for those with 120hz strobe backlight monitors, for example. If you're running three 4k monitors though.. You're probably stuck at 30fps anyway, so if your CPU can do 50fps or 120fps is irrelevant to you. GPU load would be like 12x that of 1080p, but CPU load wouldn't change much.

Quote:
If you have a Fast GPU, you need a FAST CPU to feed it.
Or the a CPU Bottleneck appears.

Exactly this, but with the important distinction of.. If you get a twice as fast GPU but run twice as intensive graphics settings so that your FPS does not increase, you probably don't need a stronger CPU. Buy CPU for an FPS target and buy GPU for a graphical-quality target.
Edited by Cyro999 - 4/24/14 at 6:35am
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post #22 of 49
Yes exactly, since the new GPU can produce more FPS, the CPU also has to work harder if you want to achieve that FPS.
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post #23 of 49
Quote:
Originally Posted by prescotter View Post

Im sorry i do not have those games, but i did a quick test with BF4.

I5 2500k 5.0Ghz, HD7970 1075Mhz Core / 1750Mhz Memory -50% power limit = Slower GPU

CPU Usage 90%

I5 2500k 5.0Ghz, HD7970 1075Mhz Core / 1750Mhz Memory +50% power limit = Faster GPU

CPU Usage pegged to 100% during gameplay.

The effect is smaller, but the faster the videocard, the faster your CPU needs to be for it not to bottleneck it.
Resulting in a higher CPU usage on the same CPU, if a faster gpu is used.
CPU also renders stuff in videogames, its not that the GPU does 100% of all the rendering stuff

Edit; Test is done in the Test Range of BF4, standing Stationary in one spot, Alt-Tabbing back to game after editing settings in MSI Afterburner.

To make things even worse, if i run Battlefield 4 without MSAA, and 100% Screen resolution, my 2500K 5.0ghz technicly Bottlenecks my HD7970 on 1080p cheers.gif
(Not 100% GPU Usage Constantly )

edit 2: plz not pay attention to the CPU speed, i think it shows a different speeds since i took the screenshot in windows, even though the game was running in the background my CPU went into Power Saving mode i geuss. (Have speedstep + all c states enabled with offset OC)
interesting...It would be great if someone does the same with an i7

But you still getting throttlimg with the 50%+ maybe you need to decrease the vcore and lower the frecuency and power limit or raise the vcore
Edited by PontiacGTX - 4/24/14 at 6:38am
post #24 of 49
Yea that would be interesting to see, but also users with Non i7 CPU could do the same style test to compare.

Just Underclock your GPU, and observe if the CPU Usage drops in a game.
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post #25 of 49
The reason my GPU usage is not 100%, is because my 2500k @ 5.0Ghz doesnt have enough power to push 100% Gpu usage constantly , without 0x MSAA and no HDAO / HBAO.

With 4x MSAA enabled + HDAO i get 100% GPU Usage constantly.

Edit: bf4 coding doesnt allow my 2500k to fully push my hd7970 to 100% constant usage at 1080p 0xmsaa no hdao.

Id like to think it is fast enough but just limited by the way the game program code is processed
Edited by prescotter - 4/24/14 at 6:51am
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post #26 of 49
Your just increasing the screen resolution a bit. That means, more VRAM usage and more load on your GPU.
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post #27 of 49
Quote:
Originally Posted by prescotter View Post

The reason my GPU usage is not 100%, is because my 2500k @ 5.0Ghz doesnt have enough power to push 100% Gpu usage constantly , without 0x MSAA and no HDAO / HBAO.

With 4x MSAA enabled + HDAO i get 100% GPU Usage constantly.
you didnt say anything about Filters...well now we know that quad cores w/o HT wont enough in the future
Edited by PontiacGTX - 4/24/14 at 7:12am
post #28 of 49
Quote:
Originally Posted by PontiacGTX View Post

you didnt say anything about fu
Filters...well mow we know that quad cores w/o HT wont enough in the future

It's very easy in many games to make CPU limit performance. People rarely pay any attention to it though, as unless performance is really bad, they're usually GPU limiting themselves to lower performance standards that some people (like me) like to keep - by turning up their graphics settings, resolution, AA etc - on GPU's that can't handle it while still producing like 100fps or where-ever the limit of the CPU is.

It's not like oh god you need a certain tier of CPU and overclock of your gpu will be "bottlenecked", it's just that every game can only reach X fps with a given CPU, and Y fps with a given GPU and set of graphics settings. Sometimes X is lower than Y, sometimes Y is lower than X, depending on your preferences and hardware


I really don't like talk of "not enough" or "bottlenecked" etc - because every time your CPU is limiting performance and your GPU is at 90% load, it's being "bottlenecked", so what?

Whenever your GPU is at 100% load and your CPU isn't maxed, you're being "bottlenecked" there too, by your graphics card thumb.gif
Edited by Cyro999 - 4/24/14 at 7:13am
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post #29 of 49
Quote:
Originally Posted by prescotter View Post

I made a example here:"

I5 2500k 5.0Ghz, HD7970 1075Mhz Core / 1750Mhz Memory -> -50% Powerlimit (Resulting in a heavily throttling HD7970, lets say performance of a hd6850)

Avarage CPU Usage while playing Red Orchestra 2 = 50%-60% CPU Usage ingame

I5 2500k 5.0Ghz, HD7970 1075Mhz Core / 1750Mhz Memory -> +50% Powerlimit (Performing like a HD7970 Ghz edition)


Avarage CPU Usage while playing Red Orchestra 2 = 100%

Both tests are done in the First Training level of the game, just viewing around for 30secs.
You can clearly see that the CPU only works as fast, as the GPU "needs".

With a faster video card giving more potential performance, the CPU has to work harder to ''feed'' the gpu.

So with my tests a Slow Performing GPU results in way less CPU usage then a Faster performing GPU.



If you think about it like this:
If you have a GTX680 or a GTX Titan, on which PC does the CPU has to "work harder, to feed and keep up" with the gpu?

I agree with all this, but your comment made it sound like the higher the fps, the higher fps CPU related stuff needs to run at, which increases CPU usage. But from the evidence you posted, I'm sure this is not what you mean. smile.gif
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post #30 of 49
Yes that is exactly my point i tried to prove.

The reason i talked about my 2500k, and GPU bottleneck in Battlefield 4 is purely because somebody noticed that my GPU Usage was not 100% Constant usage.

If you view the evidence i posted, you will see the more GPU Power i have available, the higher the CPU usage can be in a game.
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