System specs.

[MOH_Hirth]

today:
Intel Q6600
1GB DDR800
GF8800GTS640 OC

This is relative for the quality you want, today i consider my system good for IL-2, average 50/75 fps with full quality details and 1024x1280.
drivers setings: antialiasyng 8x and anisotropic disabled.

My conf ini with the best quality:
[il2]
title=Il2-Sturmovik Forgotten Battles
hotkeys=HotKey game

[window]
width=1280
height=1024
ColourBits=32
DepthBits=24
StencilBits=8
ChangeScreenRes=1
FullScreen=1
DrawIfNotFocused=0
EnableResize=0
EnableClose=1
SaveAspect=0
Use3Renders=0

[GLPROVIDER]
GL=Opengl32.dll

[GLPROVIDERS]
Open GL=Opengl32.dll
DirectX=dx8wrap.dll

[NET]
speed=8000
routeChannels=0
serverChannels=3
localPort=21000
remotePort=21000
SkinDownload=1
serverName=test
serverDescription=
remoteHost=192.168.0.104
localHost=201.9.254.106
socksHost=
checkServerTimeSpeed=1
checkClientTimeSpeed=0

[MaxLag]
farMaxLagTime=10.0
nearMaxLagTime=2.0
cheaterWarningDelay=5.0
cheaterWarningNum=-1

[chat]
region=(dx=0.6921875,dy=0.07395833,x=0.0,y=0.0)
adr0=ALL
adr1=MY_ARMY
msg2=humm\u00202\u0020years\u0020download
msg4=uns\u002050
msg6=66
msg0=np

[game]
Arcade=0
HighGore=1
mapPadX=0.66875
mapPadY=-0.046875
viewSet=34
Intro=0
NoSubTitles=0
NoChatter=0
NoHudLog=0
NoLensFlare=0
iconTypes=3
eventlog=eventlog.lst
eventlogkeep=0
3dgunners=1
SubTitlesLines=4
ClearCache=0
TypeClouds=1


[HotKey game]
PrintScreen=ScreenShot
P=pause
Pause=pause

[HotKey gui]
Escape=activate

[HookViewFly Config]
timeFirstStep=2.0
deltaZ=10.0

[HookView]
MouseLeft=Len

[HookView Config]
AzimutSpeed=0.1
TangageSpeed=0.1
LenSpeed=1.0
MinLen=1.0
DefaultLen=20.0
MaxLen=3000.0
Speed=6

[HotKey builder]
MouseLeft=objectMove
MouseRight=popupmenu
Enter=freeView
Shift MouseLeft=worldZoom
Alt MouseLeft=select+
Alt MouseRight=select-
Alt Ctrl=unselect
PageDown=change+
PageUp=change-
End=change++
Home=change--
Ctrl MouseLeft=insert+
Insert=insert+
NumPad-0=insert+
F=fill
Ctrl MouseRight=delete+
NumPad.=delete+
Delete=delete+
Backspace=cursor
Tab=cursor
F10=land
F11=onLand
NumPad-=normalLand
NumPad+=toLand
NumPad-5=resetAngles
NumPad-8=resetTangage90
NumPad-7=stepAzimut-5
NumPad-4=stepAzimut-15
NumPad-1=stepAzimut-30
NumPad-9=stepAzimut5
NumPad-6=stepAzimut15
NumPad-3=stepAzimut30

[MouseXYZ]
F1=SpeedSlow
F2=SpeedNormal
F3=SpeedFast
MouseRight=XYmove
F4 MouseRight=Zmove
MouseMiddle=Amove
F5 MouseRight=Amove
F6 MouseRight=Tmove
F7 MouseRight=Kmove

[MouseXYZ Config]
RealTime=1

[HotKey Console]
Shift Tab=Activate
[Console]
HISTORY=1024
HISTORYCMD=1024
LOAD=console.cmd
SAVE=console.cmd
LOG=0
LOGTIME=0
LOGFILE=log.lst
LOGKEEP=0

[sound]
SoundUse=1
SoundEngine=1
Speakers=0
Placement=0
SoundFlags.reversestereo=0
RadioFlags.Enabled=1
RadioEngine=2
MusicVolume=14
ObjectVolume=14
MusState.takeoff=1
MusState.inflight=1
MusState.crash=1
MusFlags.play=1
MasterVolume=11
Attenuation=7
SoundMode=3
SamplingRate=2
NumChannels=3
SoundExt.occlusions=0
SoundFlags.hardware=1
SoundFlags.streams=1
SoundFlags.duplex=1
SoundExt.acoustics=0
SoundExt.volumefx=0
SoundFlags.voicemgr=0
SoundFlags.static=1
VoiceVolume=11
Channels=2
SoundExt.extrender=0
SoundFlags.bugscorrect=0
SoundSetupId=8
ActivationLevel=0.02
Preemphasis=0.85
RadioLatency=0.5
AGC=1
PTTMode=1
SoundFlags.UseRadioChatter=0
SoundFlags.AutoActivation=0
RadioFlags.PTTMode=0
RadioFlags.PlayClicks=0
ActLevel=0
MicLevel=0
SoundFlags.forceEAX1=0

[rts]
;ProcessAffinityMask=1
mouseUse=2
joyUse=1
trackIRUse=1
DisableIME=0
locale=us

[rts_mouse]
SensitivityX=1.0
SensitivityY=1.0
Invert=0
SensitivityZ=1.0

[rts_joystick]
X=0 1 4 9 16 25 36 49 64 81 100 0
Y=0 1 4 9 16 25 36 49 64 81 100 0
Z=0 10 20 30 40 50 60 70 80 90 100
RZ=0 10 20 30 40 50 60 70 80 90 100 0
FF=0
U=0 10 20 30 40 50 60 70 80 90 100 0
V=0 10 20 30 40 50 60 70 80 90 100 0
1U=0 0 12 24 36 48 62 74 86 98 100 0
1RZ=0 8 22 46 70 94 100 100 100 100 100 0
1Y=0 1 14 29 44 58 75 89 100 100 100 0
1X=0 1 12 30 43 57 67 88 100 100 100 0
1=0 0 0 0 0 0 0 0 0 0 0 0
1V=0 100 100 100 100 100 100 100 100 100 100 0

[Render_DirectX]
TexQual=3
TexMipFilter=2
TexCompress=0
TexFlags.UseDither=1
TexFlags.UseAlpha=0
TexFlags.UseIndex=0
TexFlags.PolygonStipple=1
TexFlags.UseClampedSprites=0
TexFlags.DrawLandByTriangles=1
TexFlags.UseVertexArrays=1
TexFlags.DisableAPIExtensions=0
TexFlags.ARBMultitextureExt=1
TexFlags.TexEnvCombineExt=1
TexFlags.SecondaryColorExt=1
TexFlags.VertexArrayExt=1
TexFlags.ClipHintExt=0
TexFlags.UsePaletteExt=0
TexFlags.TexAnisotropicExt=0
TexFlags.TexCompressARBExt=1
TexFlags.TexEnvCombine4NV=0
TexFlags.TexEnvCombineDot3=0
TexFlags.DepthClampNV=0
TexFlags.SeparateSpecular=0
TexFlags.TextureShaderNV=0

HardwareShaders=0

Shadows=2
Specular=2
SpecularLight=2
DiffuseLight=2
DynamicalLights=1
MeshDetail=2
VisibilityDistance=3

Sky=2
Forest=2
LandShading=3
LandDetails=2

LandGeom=2
TexLarge=1
TexLandQual=3
TexLandLarge=1

VideoSetupId=4
ForceShaders1x=0
PolygonOffsetFactor=-0.15
PolygonOffsetUnits=-3.0

[Render_OpenGL]
TexQual=3
TexMipFilter=3
TexCompress=2
TexFlags.UseDither=1
TexFlags.UseAlpha=0
TexFlags.UseIndex=0
TexFlags.PolygonStipple=1
TexFlags.UseClampedSprites=0
TexFlags.DrawLandByTriangles=1
TexFlags.UseVertexArrays=1
TexFlags.DisableAPIExtensions=0
TexFlags.ARBMultitextureExt=1
TexFlags.TexEnvCombineExt=1
TexFlags.SecondaryColorExt=1
TexFlags.VertexArrayExt=1
TexFlags.ClipHintExt=0
TexFlags.UsePaletteExt=0
TexFlags.TexAnisotropicExt=1
TexFlags.TexCompressARBExt=1

TexFlags.TexEnvCombine4NV=1
TexFlags.TexEnvCombineDot3=1
TexFlags.DepthClampNV=1
TexFlags.SeparateSpecular=1
TexFlags.TextureShaderNV=1

HardwareShaders=1

Shadows=2
Specular=2
SpecularLight=2
DiffuseLight=2
DynamicalLights=1
MeshDetail=2
VisibilityDistance=3

Sky=2
Forest=3
LandShading=3
LandDetails=2

LandGeom=2
TexLarge=1
TexLandQual=3
TexLandLarge=1

VideoSetupId=2
Water=2
Effects=2
ForceShaders1x=0

PolygonOffsetFactor=-0.15
PolygonOffsetUnits=-3.0