I did some benchmarks a while ago
OS: Linux Mint 17.2 Rafaela (64 bit)
CPU: Intel 4690k
GPU: Nvidia GTX 650
General
SAMPLING:100%
TEXTURE:High
OBJECTS:Ultra
TERRAIN:Ultra
SHADOW:Ultra
PARTICLES:High
CLOUD:Ultra
PIP:Ultra
HDR:Standard
DYNAMIC LIGHTS:Ultra
Visibility
OVERALL: 2000
OBJECT: 1286
SHADOW: 100
Display
Fullscreen
1600x900{16:9}
AA&PP
FSAA:Disabled
ATOC:Disabled
PPAA:Disabled
ANISO. FILTERING:Ultra
AO:HDAO HDAO High
CAUSTICS:Enabled
Tested using Yet Another Arma Benchmark 0.98
Game version 1.42 Linux Average 22 FPS
Game version 1.52 Windows 7 Average 25 FPS
more test info in the google doc link
https://docs.google.com/document/d/1-g99EBnWudTvlGlRKNIjDG7rm0C6QFQPFxuWM2gHS98/edit?usp=sharing
Overall I say pretty good however it's starting to fall behind a little in updates
