i7 2600k Bottleneck??

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Kalkmann

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Jul 10, 2014
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I've just bought a GTX 780 ACX, and the GPU usage is always under 99%... like 50~80% And in games like gta iv it stays at 30~40% gpu usage. Can it be caused by a bottleneck of my i7 2600k? it is at stock speed (3.4gHz) and i cant overclock it due of my motherboard chipset.

My Specs:

- EVGA GTX 780 ACX (stock speed)
- i7 2600k 3.4 gHz
- ASRock B75Pro3m Motherboard
- 10 Gb RAM 1333 mHz (Kingstom)
- PSU TX750M Corsair
- HD 1 TB

*VIDEO:
- I've uploaded a video to provide more details about the problem:

https://www.youtube.com/watch?v=J715cM3ffX4

- Notice that in games like Battlefield 3 the GPU usage is normal (99%)
- But in games like GTAIV the usage is low (35~60%)
-Also notice that CPU usage is low like the GPU usage, then I think that the i7 2600k is not the problem
 
Solution
Deus Gladiorum
Yea, pretty much what jkteddy77 said. However, I just want to elaborate on his point that "games don't always use all of the GPU", which is true. In modern games, your GPU is likely (but not guaranteed) to reach 99%, because of how complex the algorithms are in these games. There's so much going on in rendering a single image and so much computation that your GPU is most likely going to use all of its resources (i.e. all of its shader cores, FPUs, ALUs, cache, etc). Because of APIs and the way modern games work, it's likely that each bit of your GPU is working at full capacity to render an image, which is why you're more likely to see it reach 99%.

However, for the CPU, you're far less likely to see your CPU reach 99% both...
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jkteddy77

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Jun 13, 2013
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Games don't alway's use all of the GPU, and if that game's framerate is Vsynced or capped by the game itself, your GPU will turn down to 50-80%, because it will only work hard enough to push you 60fps, or whateve the game is being capped to.

Don't mind GTA 4, PC gamer named it PC's worst coded port in history... Nobody's hardware runs that game right.
If in games like BF3 and other high intensity games your GPU is 99%, and you are getting the correct fps in these games, then I think you're fine.
 
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Deus Gladiorum

Deus Gladiorum

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Jun 29, 2013
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Yea, pretty much what jkteddy77 said. However, I just want to elaborate on his point that "games don't always use all of the GPU", which is true. In modern games, your GPU is likely (but not guaranteed) to reach 99%, because of how complex the algorithms are in these games. There's so much going on in rendering a single image and so much computation that your GPU is most likely going to use all of its resources (i.e. all of its shader cores, FPUs, ALUs, cache, etc). Because of APIs and the way modern games work, it's likely that each bit of your GPU is working at full capacity to render an image, which is why you're more likely to see it reach 99%.

However, for the CPU, you're far less likely to see your CPU reach 99% both because the programmer has to be much more specific in telling the CPU which of its resources to use and because modern graphics algorithms are almost guaranteed to be more complex than general purpose algorithms in games. For example, the floating point unit (FPU) in your CPU basically does any mathematical operation involving floating point numbers (decimal/fractional numbers, i.e. non-integer numbers). However, the arithmetic logic unit (ALU) does any mathematical operation using integers (any number that's a whole number). So for example, if the program you're using is telling the CPU to calculate 2.5 + 2.5 over and over, it's only going to be using its FPUs and not its ALUs. So basically, the reason you're not seeing your CPU usage get to 99% as often is because the programming never calls for it.

Also, GTA 4 is def not the worst port in history (but it's close). That has to go to Saints Row 2... or the original Resident Evil 4.
 
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jkteddy77

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Jun 13, 2013
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This is more than likely a GTA IV issue... not the PC itself. GTA 4 is VERY cpu bound, and all you can do is OC the CPU... which is worthless for JUST this game. Also know that almost no PC can run GTA 4 with the draw distance and render distances and stuff all the way up... Turn it down to under 50, and trust me, your game will run much better.
 
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