Can you detail how to reproduce this, what game you are running, etc?

Using the beta client and playing Counter-Strike Global Offensive.

Edit: System Information

Processor Information:
Vendor: GenuineIntel
CPU Family: 0x6
CPU Model: 0x3c
CPU Stepping: 0x3
CPU Type: 0x0
Speed: 4200 Mhz
4 logical processors
4 physical processors
HyperThreading: Unsupported
FCMOV: Supported
SSE2: Supported
SSE3: Supported
SSSE3: Supported
SSE4a: Unsupported
SSE41: Supported
SSE42: Supported

Network Information:
Network Speed:

Operating System Version:
"Arch Linux" (64 bit)
Kernel Name: Linux
Kernel Version: 3.17.6-1-ARCH
X Server Vendor: The X.Org Foundation
X Server Release: 11603000
X Window Manager: KWin
Steam Runtime Version: steam-runtime-release_2014-08-20

Video Card:
Driver: NVIDIA Corporation GeForce GTX 970/PCIe/SSE2

Driver Version:  4.4.0 NVIDIA 343.36
OpenGL Version: 4.4
Desktop Color Depth: 24 bits per pixel
Monitor Refresh Rate: 144 Hz
VendorID:  0x10de
DeviceID:  0x13c2
Number of Monitors:  3
Number of Logical Video Cards:  1
Primary Display Resolution:  1920 x 1080
Desktop Resolution: 5120 x 1218
Primary Display Size: 23.50" x 13.23"  (26.97" diag)
                                        59.7cm x 33.6cm  (68.5cm diag)
Primary Bus: PCI Express 16x
Primary VRAM: 4096 MB
Supported MSAA Modes:  2x 4x 8x 16x 

Sound card:
Audio device: Realtek ALC1150

Memory:
RAM: 11958 Mb

Miscellaneous:
UI Language: English
LANG: en_AU.UTF-8
Microphone: Not set
Total Hard Disk Space Available: 592297 Mb
Largest Free Hard Disk Block: 434310 Mb

Installed software:

Recent Failure Reports: