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GTX 780 SLI Performance Issue

mattkidd1234

mattkidd1234

mattkidd1234

Associate
Joined
27 Jan 2013
Posts
12
Hi All,

I have been using a stock EVGA 780 since launch, such a fantastic card. I have recently decided to buy another 780 from EVGA the ACX card to go alongside it in an SLI configuration.

I believe I have everything setup correctly, although my performance is awful, lots of jumping and distorted textures. Why could this be? It also appears to EVGA precision that my second card (the stock) is actually taking up all the GPU load with the primary card only taking about 40% why could this be?

I have a single SLI cable connecting the two together and both are running the recently released (327.23 drivers) on a corsair 1200W PSU. I have prompted the set-up via nvidia control panel to enable SLI on auto.

Would appreciate any help with this! :mad:
 
Have you tested both cards individually?

Have you tried reinstalling drivers?

Swap the cards about and see if that helps

What CPU are you using and at what clock speed? what games are you testing?

Hope one of those fixes the issue :)
 
I have attempted removing the drivers and performing a clean install, no luck here.

I shall try changing slots and testing each individual card, I have been using the stock for about 6 months no problem and I have been using the new card all weekend without any issues. This is concerning.

My specs are as follows:

Intel i5 3570K @ 4.3Ghz
8GB DDR3 Corsair Dominator Platinum
Gigabyte GA-Z77X-UP5 TH
EVGA GTX780
EVGA GT780 ACX SuperClock
Corsair 1200W PSU
Windows 8.1 64Bit


I have performed the Unigine Heaven Benchmark 4.0 with the following results:

Unigine Heaven Benchmark 4.0

FPS:
22.4
Score:
563
Min FPS:
5.7
Max FPS:
108.8

and have tested: Battlefield 3, Crysis 3 & the latest Tomb raider title. On the benchmark above GPU 2 was using about 91% utilisation whilst the primary was using at times less than 30%.
 
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When you are sitting on desktop, what does MSI Afterburner or Precision X say your clock speeds are?

Something is very wrong with your scores in Heaven.

Do you have the latest BIOS for your mobo? It could be an issue there.
 
Have you put your new card in and played games and checked GPU usage, very strange fault.
That is a very low score for 780's so something's wrong, it's not the built in graphics on the CPU doing something strange is it??
 
Unigine Heaven Benchmark 4.0

FPS:
70.2
Score:
1768
Min FPS:
27.1
Max FPS:
146.0
System

Platform:
Windows NT 6.2 (build 9200) 64bit
CPU model:
Intel(R) Core(TM) i5-3570K CPU @ 3.40GHz (3536MHz) x4
GPU model:
NVIDIA GeForce GTX 780 9.18.13.2723 (3072MB) x2
Settings

Render:
Direct3D11
Mode:
2560x1063 8xAA windowed
Preset
Custom
Quality
Ultra
Tessellation:
Extreme
Powered by UNIGINE Engine


I have switched the cards around and am instead getting this result, does this look more realistic to you?
 
Here is the link to the heaven benchmark scores from this site. Run these setting and compare with the other users. That does look a lot better though.

http://forums.overclockers.co.uk/showthread.php?t=18487976

1. Score 1870, GPU nvTitan, @994/1777, CPU 3930k @5.0, Kaapstad Link.@ 2560x1600

I think you used the same settings so yea your score is looking pretty good even though you are running a lower resolution.
 
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Hi,

I would also suggest to give another older driver a go and have a look if this will run better.
Have seen on 770s with the 327 driver worser performance then with 320
 
Those scores are much better :)

You will see a slight bottleneck with that 3570K and 2x780's but nothing to worry about. I would maybe try for 4.6 on the clock, just to allow the 780's a little more breathing space :)
 
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