SLI Display Issues?

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TheCPH

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Oct 9, 2013
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I wasn't exactly sure how to title this so I appreciate the time you're taking to read it. Just yesterday I installed another EVGA GeForce GTX 650 Ti BOOST SuperClocked with SLI. I didn't really seem to have as high of a framerate increase as I wanted to see, (maybe 10 frames?) because these cards in SLI on average yield a whopping 70% scaling. So in theory, my 55 frames on BF3 on Ultra should increase about 25-30 frames should it not? Thats issue #1. Issue #2 is just a couple of minutes ago when I started my PC then shut it down out of curiosity to switch which card my monitor was plugged into. (Using DVI-D) My monitor DID NOT light up, it sat there black and even the power indicator light was on yellow, not even green. while the PC was still on, I switched back to the other card (which is card number 2 I believe) and it still did not register anything. I then presumed to shut it own, and keeping the monitor plugged into the original card, and it started up saying to use Windows Startup Repair. So my questions are: 1. Why haven't I seen a more drastic framerate increase with my SLI installation? (Yes I enabled it in the control panel and windows detected and installed drivers automatically, though I even tried reinstalling them personally to no avail) and 2. What could have caused the issue with booting that seemed directly related to the switching of the input card, and the monitor not registering an input source? I know this article is very long and probably hard to follow :p so I thank you for the time you took to read this. All answers/suggestions are appreciated.
 
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TheCPH

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Yeah, it's enabled. I think my new card is slower than my old one actually. I say this because I averaged 45 frames in BF3 with my single old card and with only the new card i average about 40. Could that be some of the issue? The new card is slower so it has to lower the clock rate of the other card to match it thus hindering my SLI performance?
 
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Skeefers

Skeefers

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That could be the case; are the cards identical (i.e. same manufacturer and model)?

Edit: What motherboard do you have? Some of them will only support 16X PCIe on one slot, and when you add in a second card, both slots run at 8X instead of 16X. That could also cause the cards not to run at full capacity.
 
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TheCPH

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Should be Identical. EVGA GeForce GTX 650 TI BOOST Superclocked. Both of them from Newegg. My Motherboard is a Gigabyte Ultra Durable GA-990FXA-UD3. It claims to be SLI-Ready, and has 2 x16's and 2 x4's if im not mistaken.
 
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iam2thecrowe

iam2thecrowe

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Jul 4, 2010
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your fps limitation could be a cpu bottleneck, remember when they benchmark these cards the often use an overclocked intel 6 core $1000 cpu. i dont know about your display issue. maybe do a clean driver install, use driversweeper in safe mode, it removed reg entries and everything to do with the drivers, more than standard uninstall removes. then download and install only the latest non-beta drivers. make sure you enable sli after install.
 
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TheCPH

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I guess a CPU bottleneck is possible since I'm only running a $100 AMD Phenom II x4 965 black edition @ 3.4 GHz which is even discontinued now. What do you think now that you know my CPU? Still likely? I may take a shot at that drive sweeper program. I'm not a lucky person and I don't deal with software >.< hardware is usually my thing. But hey I appreciate the feedback man. Thanks!
 
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Skeefers

Skeefers

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Prior to my recent upgrade, I ran the Phenom II x4 965 BE with dual eVGA GTX 660 Ti's in SLI and I didn't have any issues. I don't think that CPU should be causing a bottleneck. Since your motherboard does have 2 PCIe x16 slots on it, the only thing I can suggest is to make sure that you didn't accidentally put one or both of the cards into the PCIe x4 slots on accident. The slots are marked according to the picture on Gigabyte's site, but there is an x4 in-between the 2 x16s, so make sure you skipped that one and got both cards into the x16s.
 
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iam2thecrowe

iam2thecrowe

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Jul 4, 2010
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for bf3 def a cpu bottleneck, thats why your not seeing the performance increase they show on benchmarks. shouldnt be causing any other problems though. still try driversweeper, there are lots of guides how to use it properly, its pretty straight forward, it might fix our display issue. As far as im aware, you should only be plugging displays into the primary card when running sli, but using both cards outputs is fine for general desktop apps.
 
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