Why is the Speed so slow on my GTX 970?

[iNoToRi0uS]

I'm trying to crack a WPA router from ATT. It is a 10 digit Numerical password.
I have the handshake, and converted to .hccap

Here is what I'm running:

Code:

c:\oclHashcat>cudehashcat64.exe -m 2500 -n 90 -a 3 hashcat.hccap ?d?d?d?d?d?d?d?d?d?d

It only gets to 175 kH/s

My card is the EVGA GTX 970 FTW + @ 1500Mhz