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DayZ SLI Fix (How to enable SLI)
By Weeddrunken
This Guide shows you how to enable SLI for DayZ... [NVIDIA only]
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SLI Fix
Settings:
1920x1080 (FullScreen)
& VSync Off (primary only for checking if SLI works)
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GPU Scaling:
Before: GPU1= 98%; GPU2= 9%
After: GPU1= 98%*; GPU2= 98%*

(*=plz read section Known Bug)
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SLI compatibility bits:
0x02506405 (Crysis, ArmA 2: Operation Arrowhead, ToH, ArmA 3, ArmA 2, ...)
Tutorial
0. Download [www.nvidia.com] & install the latest NVIDIA Driver
1. Download [www.guru3d.com] & open NVIDIA Inspector
(note: also extract "CustomSettingNames_en-EN.xml")
2. Go to Driver Profile Settings

=> Set Global Driver Profile to DayZ
2.1 Then set SLI compatibility bits to 0x02506405 (Crysis, ArmA2: Operation Arrowhead,...)
2.2 & set all other settings as shown below... => Apply changes
3. Enjoy DayZ with SLI enabled
Attention (Installing a new Nvidia Driver)
Unfortunately after installing a new Nvidia Driver, you have to set your SLI Profile again!
(Even with the Express Installation...)
=> BUT you can "prevent" that by Exporting all customized profiles and Import them back after the new Nvidia Driver is installed!
(Test-) System Specs:
i5 2500K @4500MHz
GTX 460 SLI @840MHz / 4000MHz R.I.P.
GTX 970 G1 @ 1.5GHz / 7500MHz (not in SLI)
16GB DDR3 @1600MHz
120GB SSD
Win 8.1 Pro 64bit

Tested on the following NVIDIA Drivers:
  • 331.93 Beta
  • 332.21 WHQL
  • 334.67 Beta
  • 334.89 WHQL
  • 335.32 WHQL
  • 337.50 Beta
  • 337.88 WHQL
  • 340.43 Beta (2nd monitor produced win8.1 bluescreen)
  • 340.52 WHQL
  • 344.11 WHQL
  • 344.65 WHQL
  • 344.75 WHQL
  • 347.25 WHQL
  • ... (till NVIDIA creates a proper driver)
My In-Game Settings
Improve Performance Tips
  • install DayZ on a SSD
  • Unpark[www.coderbag.com] your CPU cores (note: u only have to do this once)
  • Download & run Core Parking Manager[coderbag.com] (I am using 4.5)
    => Before starting DayZ set it to 100%, after back to 5%...
  • write the following line, depending on your specs, in the Launch Options of DayZ(properties)
  • i3 +1GB VRAM:
    -cpuCount=2 -exThreads=3 -maxVram=1024
    i5 +2GB VRAM:
    -cpuCount=4 -exThreads=3 -maxVram=2048
    i7 +3GB VRAM:
    -cpuCount=4 -exThreads=7 -maxVram=3072
    AMD FX8/9xxx +2GB VRAM:
    -cpuCount=4 -exThreads=7 -maxVram=2048

  • set Single Display Perfomance Mode for DayZ in the NvidiaControlPanel
  • set Texture filtering - Quality to Performance for DayZ in the NvidiaControlPanel
  • disable Vsync ingame
  • regular use of Ccleaner, Spybot, actual Chipset&Graphics drivers, WinUpdates,...
  • Win 8.1 RAM Error "not enough memory available" FIX (in case you have 8GB/16GB+)
    (open) type regedit.exe on the Win8.1 start/app screen
    in the registry editor find HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Ndu
    there you right click Start &choose change, then set the Start value to 4
    => this helped Beerdrunken eliminate lags/low fps in almost any game (i7 4770K,R9 290X,16GB DDR3 2400MHz) He noted that his system memory didn't empty by itself e.g. after stop playing a game or 2 or 3 & ran full...
in general: SLI does not double the amount of available VRAM!
Comparison Screenshots
Standard Nvidia Settings @38,8fps
SLI Fix Profile @74,7fps
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Standard Nvidia Settings @32fps
SLI Fix Profile @61,5fps
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Known BUG
Unfortunately when we're in a village, our frames drop massively.
FYI I got the same frame drops in villages with a single gpu! (GTX 970 G1)

Nature: GPU1= 98%; GPU2= 98%
Village: GPU1= 52%; GPU2= 52%

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Nature => GPU1: 98% GPU2: 98%
Village => GPU1: 78% GPU2: 78% (best measured)
Village => GPU1: 38% GPU2: 38% (worst measured)
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Possible Reasons
  • CPU can't handle the load of houses correctly: CPU Bottleneck (=engine has to be optimized)
    and / or
  • Nvidia has to integrate a real DayZ SLI profile
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Nature GPU1= 98%; GPU2= 98%
Village GPU1= 50%; GPU2= 50%
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PLZ Rate if you like... :)

& follow me for more SLI Fix Guides => click
174 Comments
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Euphoria 2 hours ago 
@ANGRY WARHONKEY©™ - You must be doing something wrong my friend, as 3 of my squad mates run 970 2-Way SLI and it works perfectly for them.
Have a read through and check everything again.
ANGRY WARHONKEY©™ Mar 1 @ 12:10pm 
does not work gtx 970 sli
Euphoria Feb 11 @ 7:16am 
@loopdk - ARMA 3 has it's own SLI profile. If it's not using more than 50% of your GPU, it may be that you need to change some Nvidia/Game Settings, or you may have a bottleneck.
loopdk Feb 8 @ 7:34am 
does it work for arma3 with out Dayz?? i triede an am only getting 55%
[Cpt]ChazRagg Jan 27 @ 12:54pm 
ok not sure 100% how i got it to work but my pc ended up crashing this morning and i had to wipe and re install so i decided to give the sli another go and i copied ever setting like i did before but i also added in setting for the dx10 versions of the setting you changed and now it seems to work fine
Euphoria Jan 27 @ 9:53am 
If you're trying to play Experimental, you need to add the "Exp.exe" to the DayZ profile in Nvidia Inspector.
[Cpt]ChazRagg Jan 26 @ 7:01pm 
@Euphoria i double checked ever setting and the only one i could see different was set Single Display Performance Mode for DayZ in the NvidiaControlPanel so i checked it when my game loaded i could see both GPU using 40% but when i joined a server and load it it went straight back to using 1 GPU
[Cpt]ChazRagg Jan 26 @ 10:44am 
@Euphoria yet i done everthing step by step and nothing
Weeddrunken  [author] Jan 26 @ 9:26am 
THX & PROPS to Euphoria
totally agree with him...
Euphoria Jan 26 @ 7:06am 
P.S. The Guide Still Works With 347.25 (Latest Nvidia Driver) :)