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axesupra
03-04-2008, 04:01 AM
heyy
whats up ppl
i have a question about the sli performance mode in nvidia control panel.
do you know what the each one is for? for example, why is single gpu named "single" after its in sli lol? that doesnt mean only 1 card is running does it? :confused:
i remember i called evga once, and they told me to use force split rendering, because it destroys the purpose of sli if u have it on single gpu. is that true?
what about others of alternate frame rendering 1 and 2?
intersting stuff.
so from your observations which option is the best for dx10 games?

thanks ppl!:)
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-RK
03-15-2008, 08:18 PM
SLI can use several rendering methods.

Split frame rendering (SFR) pretty much splits each frame in two. This means that if the image being rendered has lots of sky and a small amound of very detailed land (Crytek's games have lots of this), the sky's image will be split from the land's and one GPU will handle the sky while the other does the highly detailed land. It generally keeps the load around 50/50, but it's not perfect.

ATI crossfire has a similar method called supertiling which splits the image into many smaller images (tiles if you will) with the individual tiles being
rendered by different GPUs depending on how much work they would require.
In THEORY this makes the load much more balanced, but in practice it usually takes a little longer to do.


Alternate frame rendering (AFR) makes one card render even frames while the other renders odd frames. The problem with this is that one frame might require more rendering power than the next.


SLi AA uses the antialiasing capabilities of both cards together for 32x AA.


I can't say for DX10 games (I don't own vista), but I've always used SFR in all of my games because it usually balances best.

Sunny
03-17-2008, 05:08 PM
Regardless whether it is called single gpu mode it does not run one gpu by itself. I actually leave it at single gpu mode. Just because of the fact that if you look at all the gaming profiles that is how they all have it anyways. But you still receive performance that is better then one card I will try different things today to see if games play better and test it out.

-RK
03-21-2008, 09:09 PM
Regardless whether it is called single gpu mode it does not run one gpu by itself. I actually leave it at single gpu mode. Just because of the fact that if you look at all the gaming profiles that is how they all have it anyways. But you still receive performance that is better then one card I will try different things today to see if games play better and test it out.


uhhh... in single gpu mode it only runs one card, so it only runs ONE GPU.

But, yea a lot of games don't have their performance profiles set for SLi. You can tweak them though. :cool:


And sunny, get Crysis. You WILL be able to take advantage of tri-sli's abilities.

Radiator
03-21-2008, 10:59 PM
OT , but ... yeah.. have you people seen the video of this guy running Crysis on absolute maximum settings with 40-50 FPS ? ( 2x AA , though... but I don't consider not maxing AA not maxing the settings )

Sunny
03-22-2008, 07:32 AM
uhhh... in single gpu mode it only runs one card, so it only runs ONE GPU.

But, yea a lot of games don't have their performance profiles set for SLi. You can tweak them though. :cool:


And sunny, get Crysis. You WILL be able to take advantage of tri-sli's abilities.

How come it is that I still receive more performance and fps in Single gpu mode then?

Yeah I do have Crysis but I haven't tried it with the nvidia beta drivers for crysis patch 1.2 I want to see if that does anything cool in the performance department.

-RK
03-23-2008, 08:04 PM
maybe your driver is screwey. I found that when I got my second 7600 that I had to get optimized drivers to see more than 20% performance increase in games.

Even then, it's around 40%-55% increase in FPS.

I'm fairly sure it's not your CPU bottlenecking it.

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