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at what point is a 2600k the bottleneck!?

post #1 of 10
Thread Starter 
ok so im thinking about triple 27" monitor setup plus a 43" cinema Plasma.

which means ill be going for either a gtx680 or 7970.

BUT ill need more then 1 to accomplish a decent FPS in games over 3 HD displays,

and i was wondering IF i quadfire 7970s on a 2600k when does the CPU reach 100% usage with the GPU not being used at full potential?


ie when does the 2600k become the bottleneck!?
post #2 of 10
It's my understanding that anything beyond a dual-GPU SLI or Crossfire setup nets you almost zero gain, and in fact may decrease performance. If anything, two XFX 7970 Black Edition (DD or Ref) would suite you just fine. Also, the Kepler nVidia GPUs will treat you very well also when they're released, if you can wait for it.

I have an XFX 7970 Black Edition (Reference cooler) and it's very awesome. I imagine two is pretty spectacular
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post #3 of 10
Thread Starter 
Quote:
Originally Posted by Dienz View Post

It's my understanding that anything beyond a dual-GPU SLI or Crossfire setup nets you almost zero gain, and in fact may decrease performance. If anything, two XFX 7970 Black Edition (DD or Ref) would suite you just fine. Also, the Kepler nVidia GPUs will treat you very well also when they're released, if you can wait for it.
I have an XFX 7970 Black Edition (Reference cooler) and it's very awesome. I imagine two is pretty spectacular

the way i see it teh more screens i have the more GPUS/GPU horsepower i will need as there will be 3 full HD images. what i was wondering was say i had the 2600k at stock clock, at what point does it become the bottleneck.

i hear that Crossfire has more issues scaling then SLI so ill probly go for 680s
post #4 of 10
Quote:
Originally Posted by Big-Pete View Post

the way i see it teh more screens i have the more GPUS/GPU horsepower i will need as there will be 3 full HD images. what i was wondering was say i had the 2600k at stock clock, at what point does it become the bottleneck.
i hear that Crossfire has more issues scaling then SLI so ill probly go for 680s

The more cards you add though the less of a performance increase you see. I think I read somewhere that adding a third 6970 only increases performance 27%

In other words four 7970s won't perform like four 7970s should.
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post #5 of 10
i dont think the 2600k will ever be a bottleneck when you are running 3 screens. You will still always be limited by gpu.

Crossfire has generally better scaling but it has issues with more games. Like amd sponsored games work fine with nvidia cards, but nvidia sponsored games run horribly on crossfire generally. As amd gains more market share i think we will see less and less of those though.
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post #6 of 10
Think of it this way. CPU is like the ultimate speed limit at lower resolutions games. GPU performance is dependent on CPU. However at Eyefinity resolutions, the GPU is the bottleneck. The higher resolution you play at, the less that the CPU will become the limiter.

Like at 640x480 resolution, performance is at 600 fps. CPU has more of a factor since the GPU workload is less.

However at 5760x1200, performance would be 50 fps. GPU is the limiting factor. Using a faster GPU or CF/SLI would have more effect on performance.

Of course this depends upon the game. You have to test and see which application benefits more from CPU or GPU power.
Edited by Riou - 2/25/12 at 11:30pm
post #7 of 10
As a slight nvidia fan boy I would recommend going with a pair of 660 or 670's and the 2600k shouldn't see bottleneck for a few years , and why is it at stock clocks?? if your getting into sli and crossfirex configs you shouldn't be scared to run you 2600k at 4.3 ghz at least. Which always help fps in games slightly but trust me I've ran dual 570's with a 2500k @ 4.7ghz and I deemed it complete overkill and thats without the hyper threading of the 2600k which help in games.
post #8 of 10
Thread Starter 
Quote:
Originally Posted by magic8ball88 View Post

The more cards you add though the less of a performance increase you see. I think I read somewhere that adding a third 6970 only increases performance 27%
In other words four 7970s won't perform like four 7970s should.

i get that the scaling isnt perfect but still.

a 27% increas in FPS vs 2 7970s or 1? cos lets say your getting 100FPS 27% increase would still be an extra 27 frames and that is significant enough.
post #9 of 10
Quote:
Originally Posted by Big-Pete View Post

i get that the scaling isnt perfect but still.
a 27% increas in FPS vs 2 7970s or 1? cos lets say your getting 100FPS 27% increase would still be an extra 27 frames and that is significant enough.

I think its pointless to add another card that can only perform 25%(3 way crossfire) of what its supposed to. On the other hand 50%+ gains (2 way crossfire) is justifiable but people usually do 3 or 4 way just for looks or to win in a d*ck measuring contest (excuse the expression) anything over a certain fps can't be recognized by the human eye anyways...
Edited by randomnerd865 - 2/25/12 at 11:37pm
post #10 of 10
If your 2600k is OCed its virtually impossible for it to cause a extreme real world bottleneck as its one of the top proccessors available on the market today. Minus server CPU's. Even if its not OCed its still the top of the top in benchmarks untill ivy hits in may-june (Which is not gonna yield a huge CPU gain just onboard GPU, But OCing will be very interesting on it.)
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