[Strafe]

Hi. I don't know if my experience could help you. But lets try.
I got some problems like you are having. After read and search and many, many foruns and hours testing, I realized that the problem was with my PSU.
I changed my previous Seventeen 420 to Zalman 460. All problems gone. No more crash, Off line RPS average 80 and on line 40, using same settings.
My current "config.ini" and hardware are:

[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
change SaveAspect=0

.
.
.

[Render_OpenGL]
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=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=2

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

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

VideoSetupId=17

Water=2
Effects=1
ForceShaders1x=0
TypeClouds=1
PolygonOffsetFactor=-0.15
PolygonOffsetUnits=-3.0

ASUS K8V DeLuxe| Athlon X2 4200+ |
G.Skill F1-3200PHU2-2GBNS 2.5 3 3 6 |
Seagate 200Gb HD + Samsung 160Gb - SATA1|
BFG 7800GS OC 256mb 430@1345 Forceware 177.92|
Windows-XP SP3| MS FFB 2; ThrustmasterT. Flight Stick|
Zalman ZM460-APS |LG LCD 19" Fantasy

PS. My better and stable install was made using "pure" 4.08M + UNIFIED INSTALLER