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2 ATI HD Radeon 6990's In Crossfire Experienced Experts Only - Page 4

post #31 of 56
Thread Starter 
Quote:
Originally Posted by banthracis View Post
Why on earth are you running 2 6990's on a 1080p LED TV? It isn't even a true 120HZ as TV's accomplish 120HZ through interlacing.

A 4.0ghz X6 should have no issue running 1080p up to the FPS limit on your TV. In fact, you probably saw no improvement precisely because you're already FPS capped by your TV.

Hardware wise, yes your CPU is a bottleneck, but even if you eliminate that bottleneck you won't see any real world diff thanks to your display limiting you.

With those GPU's you'd need an 3x 1080p eyefinity setup to see a real world bottleneck.
It is true 120hz
post #32 of 56
Thread Starter 
Quote:
Originally Posted by banthracis View Post
Why on earth are you running 2 6990's on a 1080p LED TV? It isn't even a true 120HZ as TV's accomplish 120HZ through interlacing.

A 4.0ghz X6 should have no issue running 1080p up to the FPS limit on your TV. In fact, you probably saw no improvement precisely because you're already FPS capped by your TV.

Hardware wise, yes your CPU is a bottleneck, but even if you eliminate that bottleneck you won't see any real world diff thanks to your display limiting you.

With those GPU's you'd need an 3x 1080p eyefinity setup to see a real world bottleneck.
I find it hard to understand why i would need to have such high resolutions for my bottleneck to go away.

Are you saying that at lower resolutions my CPU is doing most of the work and not my GPU's?
post #33 of 56
Quote:
Originally Posted by jblanc03 View Post
I find it hard to understand why i would need to have such high resolutions for my bottleneck to go away.

Are you saying that at lower resolutions my CPU is doing most of the work and not my GPU's?
Think of your refresh rate to be a speed limit on your gpu's top speed.
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post #34 of 56
Quote:
Originally Posted by kiwiasian View Post
You can eliminate your bottleneck by overclocking your current CPU to the mid-high 3 GHz range. I don't think it's reasonable to buy a new CPU just for that.
Yeah my god. You don`t need an expert. With this CPU and these cards the bottleneck is so obvious.
Give a 2600k@4,8GHz a shot. Or wait till the 2700k arrives and again 4,8GHz.
Or if you want to stick with AMD wait till bulldizzle and again 4,8GHz (or more).
Quote:
Originally Posted by jblanc03 View Post
Are you saying that at lower resolutions my CPU is doing most of the work and not my GPU's?
This just makes no sense. You dont ned a hardcore GPU to power a 640x480 monitor.
The higher the resolution the higher the GPU power has to be. And this has nothing to do with your CPU.
The CPU does the same work, no matter how big or small your screen(s) is(are)...

And for a huge resolution you will have to have some vRAM, too.
For example if you only had 512MB vRAM then the vRAM woulb be the bottleneck.
I wonder who you can spend that amount of money for such cards without some basic knowledge.
(No offence I am just wondering, don`t take it personal)
Edited by Mr.Eiht - 10/6/11 at 12:49pm
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post #35 of 56
Quote:
Originally Posted by jblanc03 View Post
I find it hard to understand why i would need to have such high resolutions for my bottleneck to go away.

Are you saying that at lower resolutions my CPU is doing most of the work and not my GPU's?
What's your current FPS in gaming? I'm pretty sure it's close to 150 for most games. Yes you have a hardware bottleneck in your CPU, but since your display is physically not capable of showing more than 120 FPS(Assuming it is a true 120hz, which very very few tv's are). As a result, even if you upgrade CPU, you won't see any difference since you already get more FPS than your monitor can display.

Yes you can upgrade CPU an get 250FPS instead, but since your monitor won't display 250FPS it's a pointless change.

Your PC is basically overkill to the extreme for your monitor and you would need to use a higher resolution in order to bring it to the point where a CPU upgrade will result in a real world difference.
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post #36 of 56
Quote:
Originally Posted by banthracis View Post
What's your current FPS in gaming? I'm pretty sure it's close to 150 for most games. Yes you have a hardware bottleneck in your CPU, but since your display is physically not capable of showing more than 120 FPS(Assuming it is a true 120hz, which very very few tv's are). As a result, even if you upgrade CPU, you won't see any difference since you already get more FPS than your monitor can display.

Yes you can upgrade CPU an get 250FPS instead, but since your monitor won't display 250FPS it's a pointless change.

Your PC is basically overkill to the extreme for your monitor and you would need to use a higher resolution in order to bring it to the point where a CPU upgrade will result in a real world difference.
QFT. Sorry to say OP. Get a better monitor set up. You've already gone all out on your gpu. Time to go all out for your displays.
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post #37 of 56
Quote:
Originally Posted by Mr.Eiht View Post
This just makes no sense. You dont ned a hardcore GPU to power a 640x480 monitor.
The higher the resolution the higher the GPU power has to be. And this has nothing to do with your CPU.
The CPU does the same work, no matter how big or small your screen(s) is(are)...
So if I run a game at 640x480 and then run the same game at 1920x1080 you are saying that the cpu usage would be the same?
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post #38 of 56
how can you spend so much money on the gpu's and not have an eyefinity set up with 120hz monitors?
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post #39 of 56
Actually looked up LG's 42" TV's. They're all "TruMotion 120hz" which is in fact just interpolation of a 60hz signal. Basically, they display 120 frames per second, but they only accept an input of up to 60 frames and just repeat each frame twice.
http://en.wikipedia.org/wiki/Motion_interpolation

So yea, your monitor is actually only capable of displaying a 60FPS signal at most.

It's better explained by the sticky in the monitor forums.
Quote:
The benefit of 120hz technology in 120hz LCD HDTVs will not be utilized in gaming applications. The reason for this is, a 120hz LCD HDTV refreshes at 120hz, although, it will only accept a 60hz or lower input[even if they did accept 120hz inputs, it would simply render it at 60hz and double the frames; 60hz x2=120 instead of TRUE 120hz. In other words, 120hz LCD HDTVs are not TRUE 120hz displays]. Consequently, even if you are gaming at above 120 frames per second, you will not gain the benefit of seeing those additional frames.
http://www.overclock.net/monitors-di...explained.html
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post #40 of 56
Quote:
Originally Posted by jblanc03 View Post
I find it hard to understand why i would need to have such high resolutions for my bottleneck to go away.

Are you saying that at lower resolutions my CPU is doing most of the work and not my GPU's?
What people are trying to say is, you only need one HD 6990 to max out any game at 1080p currently with that 60FPS frame cap. With 2 HD 6990s, you are just not going to see the benefit of having 2 of those cards with your monitor (hence, a bottleneck because you are adding GPU power when not needed), and that is what the people are trying to say by running higher resolutions. Because no matter what you do on that single monitor, you are not making use of your CorssfireX 6990's, because a single card will do the same job as both.

Its like using a GTX 580 on a monitor with a max resolution of 1280x1024. Its overkill.

Now, if you try to run a single HD 6990 on a higher resolution, such as 2560x1600, you will see a single card starting to push its limits. This is where the 2nd card will truly shine, giving you the power when you actually need it. Or if you decide to run 3 monitors in Eyefinity, as that also increases your overall resolution.

Anotherwords, you wasted money on both those cards if all you plan to do is run at 1080p, when a single card would do the trick.
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