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Will a 1090t Bottleneck 2 GTX 570s?

post #1 of 13
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Not sure if I was supposed to post this in the processor section or the Graphics section. If I put it in the wrong section I will move the thread.

Will a 1090t bottleneck two GTX 570s? Just wondering as I might SLI two 570s as the new 990fx chipset supports SLI.
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post #2 of 13
Simply put, yes. My 1100T @ 4GHZ CPU/NB @ 3GHz bottle necks my 5870s a wee bit. More on some games, none on others.
Edited by Darkcyde - 6/11/11 at 7:41am
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post #3 of 13
Quote:
Originally Posted by mcnabbmc View Post
Not sure if I was supposed to post this in the processor section or the Graphics section. If I put it in the wrong section I will move the thread.

Will a 1090t bottleneck two GTX 570s? Just wondering as I might SLI two 570s as the new 990fx chipset supports SLI.
I've heard from many people that it's aweful for bottlenecking high end graphics cards when they are running in CF or SLI. Even if you overclocked that CPU high, you might still run into a bottleneck. I would suggest buying 2 GTX560's and OC the CPU as high as possible.
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post #4 of 13
It's pretty sad that a high end 6-core processor bottlenecks 2-Way SLI or Crossfire video cards. That's why I went from my 1090T to a 2600k.
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post #5 of 13
The correct answer here is the same as always ... regardless of which processor, or which gfx card you ask about:

It depends on the test you run (i.e. what bench/game), and what settings you run that test at (resolution, AA, etc).


Personally, I always recommend getting the graphics card(s) you want to get, regardless of your CPU. This is because, even with a CPU BN, the GPU is going to be the part that determines your 'max playable settings' in terms of image quality.

Put another way, even if you have a CPU that's relatively slow and often limits your average framerate, generally all you have to do is increase the difficulty level for the GPU by increasing the IQ settings (thus lowering the FPS, but making it look better), and the effect of the CPU bottleneck will be diminished or even removed.

Plus, you can always upgrade the CPU later.

So that's why I say: get the GPU(s) you really want.
    
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post #6 of 13
Sadly, it will.

I'm running sig rig and I'm fine but it's a single card configuration.
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post #7 of 13
Quote:
Originally Posted by mcnabbmc View Post
Will a 1090t bottleneck two GTX 570s? Just wondering as I might SLI two 570s as the new 990fx chipset supports SLI.
I will give my analysis below. It is a little long and detailed:-

1) benchmarkextreme has tested a Phenom II x6 1100T with GTX570 (single, SLI, 3-way SLI) for 14 game benchmarks at 2560x1600. One of the conclusions of their study is:
Quote:
A stock Phenom II X6 1100T is sufficient to run GTX 570 and GTX 570 SLI at full potential.
Link:http://benchmarkextreme.com/Articles...1100T/P17.html

2) CPU consideration
OP's 1090T is more or less the same as an 1100T, so we can treat them the same for the time being.
The only question left is OP's 1600x900 (as in sig rig) vs guru3d's 2560x1600.

3) Resolution consideration

When the resolution goes down from 2560x1600 to 1600x1200 (close enough to 1600x900), framerate will increase because the GPUs have less data to calculate. Using guru3d's another review of GTX570 SLI over 7 game benchmarks at 1600x1200, I calculate the average % increase in fps as:- (55+49+37+47+100+25+48)/7= 37%
Link:http://www.guru3d.com/article/geforc...0-sli-review/5

This fps % increase will happen only if the CPU can keep up its pace to communicate with the GPUs as not to bottleneck them. So, can a stock 1090T keep up with this 37% fps increase?

Generally speaking, besides lowering the resolution, increasing the processing power of a graphics subsystem can also increase the framerate. In other words, we can simulate the impact on a CPU due to a lowering of resolution from 2560x1600 to 1600x900 by increasing the graphics power by going from GTX570 2-way SLI to 3-way SLI on the same resolution because both changes can increase the fps load.

Let us return to benchmarkextreme's study as they have such data available:-
For 14 game benchmarks at 2560x1600, the average % increase in fps is:-
If 1100T at 3.3GHz, then (44+38+10+10+11+12+36+ 8+26+45+45+26+5+38)/14 = 25%
If 1100T at 4.2GHz, then (44+44+19+30+23+28+39+16+39+48+48+42+1+40)/14 = 33%

4) My conclusions
1. As the 33% figure is close enough to the 37% figure, an overclocked (4.2GHz) 1090T can handle GTX570 2-way SLI at 1600x900 with minimal or no bottleneck. This is generally speaking, of course, as the 33% is an averaged number of 14 game benchmarks.

To be precise, I go to each individual game benchmark.
For those 8 games with % (44, 44, 39, 39, 48, 48) larger than 37%, it can be concluded there is no bottleneck.
These games are:- Aliens vs Predator, Bottleforge, Lost Planet, Mafia 2, Metro 2033, Napoleon Total War, Necrovision, Stalker Call of Pripyat.

For the other 6 games (19%, 30%, 23%, 28%, 16%, 1%), there is various amount of bottlenecks.
These games are:-Cryostasis, Crysis Warhead, Far Cry 2, Hawx 2, Lost Planet 2, Resident Evil 5).

2. If the 1090T is not overclocked but remains at stock 3.3GHz, then only 5 games will exhibit no bottleneck while 9 will have various amount of bottlenecks.

3. Overall speaking, even when there is a bottleneck, its amount is not huge, especially when the 1090T is overclocked to 4.2GHz.
So, IMHO, using GTX570 2-way SLI for 1600x900 with a 1090T is certainly a good choice.
post #8 of 13
I highly doubt you will see any bottleneck.
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post #9 of 13
Quote:
Originally Posted by brettjv View Post
The correct answer here is the same as always ... regardless of which processor, or which gfx card you ask about:

It depends on the test you run (i.e. what bench/game), and what settings you run that test at (resolution, AA, etc).


Personally, I always recommend getting the graphics card(s) you want to get, regardless of your CPU. This is because, even with a CPU BN, the GPU is going to be the part that determines your 'max playable settings' in terms of image quality.

Put another way, even if you have a CPU that's relatively slow and often limits your average framerate, generally all you have to do is increase the difficulty level for the GPU by increasing the IQ settings (thus lowering the FPS, but making it look better), and the effect of the CPU bottleneck will be diminished or even removed.

Plus, you can always upgrade the CPU later.

So that's why I say: get the GPU(s) you really want.
Basically this, if you can pushing your 570s so much the average fps isn't much over 50 anyways you'll be fine.

However any sort of benchmarking, or games like Crysis 1/WoW will expose massive bottlenecks in your setup.

If you want I can disable turbo run some benchmarks from games you play, 3.3GHz should be fairly close to a maxed out 1090T. My 470s are up to the task of match 570 stock performance.

Here is a clear example of a cpu bottleneck, and how much added AA/res levels you'd need to push to get rid of it.

http://www.overclock.net/nvidia/8073...gpu-usage.html

(keep in mind since the cpu is bottlenecking that is his max fps, all he can do is increase IQ levels to increase gpu strain while maintaining close to the same fps (never higher).)



Also its important to note that with the bottleneck that will occur, it would make more sense to get lower end gpus since bottlenecks = money wasted.

Also I've never confirmed it, but I believe AMD's cards like the 6950 uses less cpu for its fps. You may want to look into that.
Edited by BallaTheFeared - 6/11/11 at 8:21pm
    
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post #10 of 13
Quote:
Originally Posted by BallaTheFeared View Post
Basically this, if you can pushing your 570s so much the average fps isn't much over 50 anyways you'll be fine.

However any sort of benchmarking, or games like Crysis 1/WoW will expose massive bottlenecks in your setup.

If you want I can disable turbo run some benchmarks from games you play, 3.3GHz should be fairly close to a maxed out 1090T. My 470s are up to the task of match 570 stock performance.

Here is a clear example of a cpu bottleneck, and how much added AA/res levels you'd need to push to get rid of it.

http://www.overclock.net/nvidia/8073...gpu-usage.html

(keep in mind since the cpu is bottlenecking that is his max fps, all he can do is increase IQ levels to increase gpu strain while maintaining close to the same fps (never higher).)
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