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Bottleneck on SLI MSI GTX 660 TI?

Last response: in Graphics & Displays
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September 12, 2013 8:43:12 PM

I've been searching all over the internet for a clear answer to my specific problem, there are none that seems to be helping or accurate each answer contradicts the other. What I am trying to seek is if my 660 TIs are being bottlenecked in anyway or not at all. The game that I really have noticed my confounding problem is Battlefield 3, as is mostly everyone's. My GPU usage alternates from 50-90% with 55-100 FPS when playing, and to my understanding I am supposed to be getting above 90% and about 65-120 FPS all of the time. I have tested each card individually and each one is working perfectly at 98% usage and above at all times. My CPU is always at 90-99% load @4.1 GHz and 1.23 v. I have Overclocked my CPU even further to 4.6 GHz and only stable with 1.35 v, and still no help to the GPUs as well as my CPU getting too hot at that voltage. I have tried "Prefer Maximum Performance" and enhancing AA graphics in the Nvidia Control Panel. If anyone here would be kind enough to give a clear response to my dilemma, I would greatly appreciate it.

My PC Specs:
i5 2500k @ 4.1 GHz
H80i CPU cooler
MSI Z77-G45 Gaming MOBO
Corsair HX750 PSU
Intel 75GB SSD
WD 1TB HDD
MSI GTX 660 TI (2-way SLI)
Cooler Master CMstorm Scout 2 Case

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a c 179 à CPUs
a b Î Nvidia
September 12, 2013 8:52:38 PM

I see absolutely no problems here.

Also, I would recommend you play at 60FPS VSYNC'd.

Most screens are 60Hz so can't display any more than 60FPS. You also get SCREEN TEARING by the GPU sending images faster than the screen can display.

Finally, your computer will be far, far quieter at 60FPS as your GPU and CPU fans can throttle down a lot instead of constantly running at or near maximum.

Other:
- don't use deferred AA (causes muddy picture)
- tweak down slightly if you can't maintain 60FPS (keep dropping into the 50's). Regardless of what FRAPS may say, if you have VSYNC ON and drop below the refresh rate (i.e. 60FPS) you actually resynch at 30FPS to maintain the proper synch rate with the monitor (if it can't do 60 it does 30).
- Adaptive VSync was created to solve the above issue (you can Google that if you need to). Great idea except it then turns off VSYNC during custscene videos causing screen tearing. Sigh.

Summary:
- no problems I can see
- recommend 60FPS VSYNC'd
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September 12, 2013 9:02:07 PM

Did you try overclocking your GPU memory? Even a single GTX660Ti is bottlenecked by its own memory bandwidth, I can imagine 2x in SLI being worse.

Just a theory worth trying out.
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September 12, 2013 9:07:18 PM

Zero_ said:
Did you try overclocking your GPU memory? Even a single GTX660Ti is bottlenecked by its own memory bandwidth, I can imagine 2x in SLI being worse.

Just a theory worth trying out.


Yes I have overclocked my GPU many times. Sadly does not help either.
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September 12, 2013 9:10:00 PM

DrowningMoose said:


Yes I have overclocked my GPU many times. Sadly does not help either.


And so my theory fails :( 
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September 12, 2013 9:19:50 PM

photonboy said:
I see absolutely no problems here.

Also, I would recommend you play at 60FPS VSYNC'd.

Most screens are 60Hz so can't display any more than 60FPS. You also get SCREEN TEARING by the GPU sending images faster than the screen can display.

Finally, your computer will be far, far quieter at 60FPS as your GPU and CPU fans can throttle down a lot instead of constantly running at or near maximum.
Thanks for the advice. I tried using vsync in game and definitely noticing the non screen tearing but I notice that I was skipping ahead of my self a little bit like there was a cut while playing for half a second? No idea what it is
Other:
- don't use deferred AA (causes muddy picture)
- tweak down slightly if you can't maintain 60FPS (keep dropping into the 50's). Regardless of what FRAPS may say, if you have VSYNC ON and drop below the refresh rate (i.e. 60FPS) you actually resynch at 30FPS to maintain the proper synch rate with the monitor (if it can't do 60 it does 30).
- Adaptive VSync was created to solve the above issue (you can Google that if you need to). Great idea except it then turns off VSYNC during custscene videos causing screen tearing. Sigh.

Summary:
- no problems I can see
- recommend 60FPS VSYNC'd


I used V-sync and I loved the non tearing of the screen very smooth gameplay but for some reason I experienced a slight skip ahead of myself in game almost like a tiny hiccup every second but my frames stay constant so its not frame skipping. I have no idea what it could be any suggestions?
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a b à CPUs
a b Î Nvidia
September 12, 2013 10:20:07 PM

the 2500k wont even bottleneck two titans
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September 12, 2013 10:48:39 PM

GamerXtreme2013 said:
That can be input lag.


You're right and I fixed that by typing gametime.maxvariablefps 58 and that definitely did the trick. But what exactly is the cause of the input lag? My monitor is an ASUS something at 1920x1080 and 60Hz refresh rate
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September 13, 2013 12:11:59 AM

Your setup/rig is totally fine, nothing wrong with it, im glad to be able to help you determine the slight problem u had there which is that slight input lag.
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September 13, 2013 12:40:00 AM

GamerXtreme2013 said:
Your setup/rig is totally fine, nothing wrong with it, im glad to be able to help you determine the slight problem u had there which is that slight input lag.


So is 50-90% usage normal for an SLI setup in Bf3?
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September 13, 2013 1:55:05 AM

Yes it is - even so your running two GPU setup, both of it still runs the same workload to give you that better fps and smoother gameflow. So about 50-90% sounds about right when youre playing demanding games like bf3.
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a c 179 à CPUs
a b Î Nvidia
September 13, 2013 3:23:53 AM

DrowningMoose said:
GamerXtreme2013 said:
That can be input lag.


You're right and I fixed that by typing gametime.maxvariablefps 58 and that definitely did the trick. But what exactly is the cause of the input lag? My monitor is an ASUS something at 1920x1080 and 60Hz refresh rate


I had no issue in BF3 with a single card, but as long as it's working I guess.

Speaking of which, I finally, finally solved the stutter issue with these Bethesda games: Fallout NV, Fallout 3, Oblivion

change "ifpsclamp=0" so the zero is a "60" (or your refresh rate)

As long as you don't deviate from this you should be fine (not a good idea for people who dip below 60 but with VSYNC you shouldn't go above).

It's in the main INI file in the appropriate Documents folder. Not sure if I changed the one in the main game folder either. You can easily google the file name.

My games went so smooth I wanted to cry (mainly because I'd finished them a long time ago WITH the stutter). I almost want to play NV again. There are "stutter fix" mods but they work by synching to 30FPS which sucks as it's so sluggish. Also, it didn't work for 50FPS. I got a different stutter (I set my desktop and thus game 50FPS and ifpsclamp to 50 but that wasn't smooth).
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a c 155 à CPUs
a b Î Nvidia
September 13, 2013 5:56:22 AM

You should be able to get at least 4.4ghz at around 1.3v on your 2500k with that cooler.
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