https://steamhost.cn/steamcommunity_com/app/221100/discussions/0/3315110799614194405/

My guide is outdated. Peace

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, ...)

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

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!

i5 2500K @4500MHz
GTX 460 SLI @840MHz / 4000MHz R.I.P.
16GB DDR3 @1600MHz
120GB SSD
Win 8.1 Pro 64bit
FYI: I got a GTX 970 G1 @ 1.5GHz / 7500MHz (none SLI) so I can't update this guide anymore.

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)

• 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)

[/i] 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...

[/list]
in general: SLI does not double the amount of available VRAM!

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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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... :)

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