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[H] GeForce GTX 680 3-Way SLI and Radeon 7970 Tri-Fire Review - Page 2

post #11 of 68
Seriously though they need to test more games. Had they put in Crysis, Metro and AVP this would be a completely different review. I don't know how these review sites justify testing four games and putting it up online as a definitive test. ALso ridiculous that they tested tri-fire on a PCI 2.0 system as it's been shown over and over it limits it pretty severely at high resolution.

Fail review just like the recent Quad SLI/Fire review.

As the owner of several different SLI/CF setups by the way I've found Nvidia and AMD to be equally smooth as long as your framerate is over 60. Under 60 and the microstutter starts to really kick in. Maybe it was worse on AMD, I don't know. I could never tell anyway.
    
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post #12 of 68
Thread Starter 
Quote:
Originally Posted by IcedEarth View Post

I'm undecided about any test done on these cards.
Look at how much AA affects the GTX680 in BF3, just as it should due to a VRAM limit. Yet they insist that it feels smoother?
Then look at how the GTX680 scores so well with max AA in Deus Ex: HR, even though we all know there should be a limitation. The margin between the 680 and 7970 here is stupidly insane for no apparent reason.
This all has to be driver related. AMD really need to get their drivers into shape ASAP, the 7970 was kicking ass in BF3 like it was meant to, yet actual gameplay performance sucked (one reason why I always say benchmarks are completely useless), then in other games the 7970 was getting destroyed for no apparent reason.
I bet with a better driver package, the 7970 would be dominating the 680's in any game. I think this review indicates that. There's no way Deus Ex was a hardware limitation, absolutely no way. The same goes for BF3 and the quality of the game play, even though it was putting out more consistent frames.

As long as you don't hit the VRAM limit on the 680's by doing stuff like 4x MSAA in BF3, it will run fine. I think 4x MSAA in Surround and Eyefinity is pretty much pointless anyway at that high of a resolution, especially when FXAA takes care of most aliasing. MSAA also has a large performance hit on both setups while FXAA is virtually free.

Having used both high-end setups from both camps, I have noticed SLI being smoother just like [H] mentions. I think it is the way crossfire is handled versus SLI. With the last generation, Tom's did some testing and found this:


444

You can see in crossfire the frames are a lot more all over the place versus SLI, reducing smoothness.
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post #13 of 68
The secret is to only SLI or CF top end cards. Obviously mid-range cards are going to have a tougher time at it because they will struggle in some cases to hit 60 evenly. Looking at that graph they don't really look much different. The 6870 CF has higher peaks and valleys but seems to be more consistent overall.

I'd be much more interested however in a frametime graph like that using 7970 and 680 CF/SLI. I mean users will already tell you mid-range cards are suseptible to stutter.
    
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post #14 of 68
Quote:
Originally Posted by jtom320 View Post

The secret is to only SLI or CF top end cards. Obviously mid-range cards are going to have a tougher time at it because they will struggle in some cases to hit 60 evenly. Looking at that graph they don't really look much different. The 6870 CF has higher peaks and valleys but seems to be more consistent overall.
I'd be much more interested however in a frametime graph like that using 7970 and 680 CF/SLI. I mean users will already tell you mid-range cards are suseptible to stutter.

Whether they stutter at 150fps or 80 fps, they're still going to stutter. It doesn't get better with 6970s. They just do it at higher frame rates. The stuttering is simply the abnormal delay of a frame compared to the previous one. If AMD had 30ms delays consistently and Nvidia had 10ms delays consistently, you wouldn't notice the difference as much because your eyes can easily get used to the consistency. Part of the reason why 24fps movies don't feel stutter(y). It's the wild fluctuations that throw you off.
post #15 of 68
Quote:
Originally Posted by PoopaScoopa View Post

Whether they stutter at 150fps or 80 fps, they're still going to stutter. It doesn't get better with 6970s. They just do it at higher frame rates. The stuttering is simply the abnormal delay of a frame compared to the previous one. If AMD had 30ms delays consistently and Nvidia had 10ms delays consistently, you wouldn't notice the difference as much because your eyes can easily get used to the consistency. Part of the reason why 24fps movies don't feel stutter(y). It's the wild fluctuations that throw you off.

Makes sense. Neither card though in that graph is completely consistent. Like I said other then the huge peak and two dips in the beginning the 6870CF is actually smoother. The other odd part in that graph is the 560ti single card doesn't look consistent at all which doesn't really make sense. Maybe I'm just reading the graph wrong though.

I understand your point in theory but through experience I've found (and I've used both 480s and 5850s in multi-GPU setups) that if your setup has the grunt to lock 60FPS /w vsync you are good in terms of MS. Otherwise for example I played some BF3 on my 5850s before I got rid of them you will get terrible stutter once you drop down into the 40-50 FPS range.
    
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post #16 of 68
Same thing as CF vs SLI results. Based on the review SLI feels smother even with less fps. There must be more too this. Also you cant really base decisions on what what person experiences.
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post #17 of 68
Quote:
Originally Posted by jtom320 View Post

Makes sense. Neither card though in that graph is completely consistent. Like I said other then the huge peak and two dips in the beginning the 6870CF is actually smoother. The other odd part in that graph is the 560ti single card doesn't look consistent at all which doesn't really make sense. Maybe I'm just reading the graph wrong though.
I understand your point in theory but through experience I've found (and I've used both 480s and 5850s in multi-GPU setups) that if your setup has the grunt to lock 60FPS /w vsync you are good in terms of MS. Otherwise for example I played some BF3 on my 5850s before I got rid of them you will get terrible stutter once you drop down into the 40-50 FPS range.

[H[ had a previous article this discussed stuttering at below 60 fps in the 2-way 680SLI review. Nvidia SLI felt much smoother even at 30fps compared to Tahiti which needed to be closer to 60 to feel the same. Yes stuttering is more obvious ~40fps for all cards but even at 80fps on a 120hz monitor, you can notice micro-stutter. Also, what drivers were you using on the 5850s? Once AMD changed their drivers to improve CF scaling dramatically, micro-stutter became much more prevalent.
Edited by PoopaScoopa - 4/25/12 at 12:59pm
post #18 of 68
Running Tri-Fire on debut drivers was destined for failure! Yet they had no choice....should have waited to do the review thumb.gif
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post #19 of 68
Quote:
Originally Posted by PoopaScoopa View Post

[H[ had a previous article this discussed stuttering at below 60 fps in the 2-way 680SLI review. Nvidia SLI felt much smoother even at 30fps compared to Tahiti which needed to be closer to 60 to feel the same. Yes stuttering is more obvious ~40fps for all cards but even at 80fps on a 120hz monitor, you can notice micro-stutter. Also, what drivers were you using on the 5850s? Once AMD changed their drivers to improve CF scaling dramatically, micro-stutter became much more prevalent.

Dude I couldn't even told you I sold my 5850s back in December. I kept them up to date though. I could totally buy that SLI is smoother at 30FPS but I still think both are choppy under 60 with multi-GPU.
    
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post #20 of 68
Quote:
Originally Posted by jtom320 View Post

Dude I couldn't even told you I sold my 5850s back in December. I kept them up to date though. I could totally buy that SLI is smoother at 30FPS but I still think both are choppy under 60 with multi-GPU.

Thats true. Basically SLI is better in CF when both suck. Just because something is better then the other thing does not make it any better. Also i want to see if 12.4 did anything for AMD.
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