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GTA IV: SLI vs Non-SLI

post #1 of 12
Thread Starter 
Hi guys,

I just used the benchmark tool included with GTA IV to see the fps I get when SLI is enabled and I am shocked!


Non-SLI:
Quote:
Average FPS: 63.74
Duration: 37.47 sec
CPU Usage: 45%
System memory usage: 44%
Video memory usage: 81%

And SLI:
Quote:
Average FPS: 65.35
Duration: 37.29 sec
CPU Usage: 44%
System memory usage: 46%
Video memory usage: 81%

Settings used:
Quote:
Video Mode: 1920 x 1080 (60 Hz)
Texture Quality: High
Shadow Quality: High
Reflection Resolution: High
Water Quality: High
Texture Filter Quality: Anisotropic x8
Night Shadows: High
View Distance: 30
Detail Distance: 40


As you can see, CPU, memory and GPU usage is pretty much the same in both runs. So this is a CPU bottleneck? Or SLI is just not meant for GTA IV? I know both GPUs are being used because after the SLI enabled benchmark run, I looked at Afterburner and the usage graph for both GPUs had activity plotted on it.

So what's happening here? confused.gif
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post #2 of 12
nah its not your CPU, SLI is just not meant for GTA IV.
post #3 of 12
GTA is a badly coded game
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post #4 of 12
You aren't going to get any additional performance in SLI really, it's the same for my GTX480's.
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post #5 of 12
GTA is a console port. That's all that needs to be said.
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post #6 of 12
Firstly, the benchmark is a completely broken mess and should not be used for any sort of FPS guidance whatsoever.

Secondly, the Phenom x6 will probably not get much more than 60fps at those settings without overclocking. The thing to remember is that GTA4 is - in simple terms - seeing your processor as a tri-core. Meaning it can only utilize half your processor. This means high clock speed & architecture are key to good performance; an overclocked Sandy Bridge would perform phenomenally compared to competition on this game.

Some people report worse FPS with SLI on GTA4, so I generally recommend to keep it disabled. Not to mention the microstutter.
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post #7 of 12
Thread Starter 
Just for the heck of it, I tried messing with it in NVIDIA Control Panel but still same results. What a shame! (And waste of a GPU!) sad-smiley-002.gif GTA IV and Bad Company 2 are the games I actually play most.

Oh well ..


Cheers for the replies peeps, appreciate it thumb.gif


EDIT: OverTheBelow, cheers for the detailed reply. My X6 is already at 4.13. Can't do any more than that, sadly. I had planned to be using a 2600k and a P67 by this weekend, but saw a post in the news section a couple of days ago about Bulldozer possibly being compatible with current AM3. So I decided to wait. smile.gif
Edited by JCG - 3/18/11 at 12:35pm
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post #8 of 12
I just experimented with GTA4 now that i popped another 8800gt in my system for sli and had different results.

Previously: ~46fps

SLI: ~65fps

I use medium texture settings as the 8800gt is 512mb. Processor is an AMD Phenom x2 555BE unlocked to a 4 core B55 overclocked to 3.6ghz.
post #9 of 12
There is an FPS cap of like 64-65.

The benchmark is useless. USELESS.
post #10 of 12
im using sli hack with old drivers coz i have no sli bridge (getting one today) and i found a noticeable in game performance, i dont benchmark, i play games. get the fps counter up and you should see a nice difference, at least i did, even with beefier settings.
    
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