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550TI SLI Single Monitor Lower FPS in SLI Mode

Last response: in Graphics & Displays
July 26, 2012 5:21:41 AM


I have 2xGTX550TI's running in SLI, i am getting a MUCH lower fps count in games (15-20fps) that i do with one 550TI running without SLI. All games run very choppy too :( 
Sorry for bad english I am from sweden.

12 gb ddr3 ram
2xgtx550ti SLI
i5 3570k 3.5GHz
MSI 7676 Motherboard
850W PSU
July 26, 2012 6:04:06 AM

I tried reinstalling drivers after using driver sweeper, still same problem
Related resources
July 26, 2012 6:13:18 AM

I'm using fraps, you can easily tell that the perfomance with two cards in sli is worse that just 1 card even without fraps, it makes somegames unplayable.
I go from 60 fps on battlefield 3 on mid settings 1920*1080 to 15 fps with sli.
a b U Graphics card
July 26, 2012 6:16:20 AM

Hmm. You might have a bad card. Have you tested them both in single card mode? Also, what PSU do you have? I know it says 850W, I'm just curious :) 
a b U Graphics card
July 26, 2012 6:20:03 AM

Is this your motherboard?

If so, your problem is that one of the PCI-E is X4, which means that in SLI, your cards are bottlenecked by this, as in SLI both cards will run at X4. There really isn't a good way to get good performance from any SLI setup on that board.

As I see it, you have 3 options.

1) Get a new motherboard that supports 8X/8X or 16X/16X for dual video cards

2) Sell both you 550TI's and get a 560TI or better.

3) Sell one 550TI and game with the other.
July 26, 2012 6:20:40 AM

I have tested them both in single card mode and they both run equally as well.
I have an 850 Tsunami PSU :p , i know it's not a name brand.
a b U Graphics card
July 26, 2012 6:28:19 AM

That board supports 8X/8X PCI-E. So that can't be the issue. Fraps will drain FPS, though not that much. I think it might be a stuttering issue with SLI and your hardware.

One last thought, what are your PCI-E settings in the BIOS?
a c 109 U Graphics card
July 26, 2012 6:44:26 AM

Do you have an SLI cable?
July 26, 2012 6:52:09 AM

Yes I have an sli cable lol, there is no setting for pci-e, i found a setting called PCI Latency timer? It had options for timings
a b U Graphics card
July 26, 2012 6:55:10 AM

I doubt the answer will be found there. Is there a heat issue in your case with 2 550TI's being next to each other?
a c 109 U Graphics card
July 26, 2012 6:56:00 AM

Did you try the new BETA drivers?

Did you see if both of the cards are running at the same speeds when under stress?
July 26, 2012 6:57:20 AM

The motherboard's pci slots are fairly wide apart so i know they can breathe, i will download beta drivers and report back. :) 
July 26, 2012 8:16:28 AM

I tried the newest beta drivers for the 500 series and i got the same issue, how do i check if they are running at the same speeds?

What should I do if they are running at different speeds?
July 26, 2012 11:44:04 AM

I ran the windows experience index with SLI enabled and it went from a 7.4 to a 6.8 in Gaming Graphics.
a b U Graphics card
July 26, 2012 12:54:48 PM

Are both of your 550TI's identical? Same manufacturer? Or same clock speeds and spec?
July 26, 2012 1:17:32 PM

stant1rm said:
Are both of your 550TI's identical? Same manufacturer? Or same clock speeds and spec?

From what I am understanding now this shoudn't matter. clock speeds and ram should be able to be different (though wasteful) as long as it is the same GPU.
a b U Graphics card
July 26, 2012 1:21:27 PM

just sell them and get a single GTX 560 TI or HD 7850 ?
a b U Graphics card
July 26, 2012 1:27:32 PM

I'm wondering if it is the same gpu. Do you maybe have a 550, and 550TI?
a b U Graphics card
July 26, 2012 1:43:25 PM

together they drawing about 300W ?
a b U Graphics card
July 26, 2012 1:47:28 PM

A thousand watt PSU? uhhh... That's pretty extreme. A good 600W PSU is more then enough. Look at Antec, OCZ, Seasonic for good PSU's. I personally like the Antec Trio 650W or OCZ Modstream 700W for your build.
July 26, 2012 1:56:33 PM

yeah I would not even get a 1000w PSU for a couple 670 ti's in SLI....

This isnt sounding like a power issue to me.
July 26, 2012 2:07:11 PM

I just installed the 296.10 legacy drivers and got a slight FPS increase :o 
July 26, 2012 2:10:17 PM

Try different drivers until you fine the right one. This seems to make the most sense.
a c 109 U Graphics card
July 26, 2012 2:14:54 PM

Also try to replace that power supply! :ouch: 

July 27, 2012 12:22:10 AM

I live in australia though lol :D 
Im going to try all drivers tonight
a b U Graphics card
July 27, 2012 12:48:09 AM

I love Australia! I lived there for a summer :D 
July 27, 2012 12:54:41 AM

sell both of em and get GTX 560 Ti...eheh
a b U Graphics card
July 27, 2012 3:02:28 AM

Or get a GTX 570 for $220 on Newegg :) 
July 27, 2012 5:02:05 AM

I mistakenly left this out.

These are the cards in sli
One is windforce the other isn't, could that be an issue? Are they clocked differently?
Card 1

Card 2
July 27, 2012 11:50:01 AM

no, it should not have any problems, because they are the same GTX 550 Ti. It is not whether Winforce, or non-Winforce, Asus, Palit, etc, as long as you have 2 same GTX 550 Ti, it shouldn't have any issues in SLI.
August 3, 2012 2:02:51 AM

Hello again :) 

After some constant tweaking in the Global Settings Option in the Nvidia Panel, I saw no prevail, so I decided to put the single fan GPU (which is clocked lower by factory default) in the first PCI slot. This generally fixed the problem, i still get fps drops in battlefield 3. Sometimes I can run Ultra at 1920x1080 at 60 fps without AA on and sometimes it runs at 20-40 fps, I don't know what is causing the inconsistency of the performance, if anyone has any other tips as how to fix this issue it would be greatly appreciated.

Thankyou for your help