SSD 4K speed is very slow

I bought SSD Sandisk Extreme Pro. Tests 4k-32k show slow speed. My comp details: Motherboard GA-Z67-AP-D3 with the latest Firmware FD. Driver Intel® Desktop/Workstation/Server Express Chipset SATA AHCI Controller.

Windows 7 sp1 64 bit. Antivirus is not installed.
What kind of problem can it be? And are there any ways to solve it?



My request is closed. The problem turned out to be not in SDD.


Care to share what the issue was? It may help others as well. 

Yes, please! I have same problem, how to solve it?