very slow gpu wpa ocl hashcat

cant find this issue solved in the forums (saw similar mentioned but didnt help me)
- ocl hashcat is very very slow on my gpu, getting just 2,700 hashes a second for wpa. All online benchmarks, info etc say should be getting much more.
Details: windows 10 64 bit, using latest hashcat - 2.01, and latest nvidia drivers catalyst 15.7. even with -w 3 command, i get 97% (aprox) usage of GPU, yet only 2,700 hashes per second speed.
a benchmark test said speed was 2807 a sec. I tried with  1.5, 1 and 10 gig wordlists seperately, (i have only tried using wordlists, not bruteforce etc), and the lists are stored localy on c drive. I am not using any rules, and my reject count is 0%.
My command line is: oclHashcat64 -m 2500  -w 3 optus.hccap C:\Users\TOSHIBA-PC\Desktop\wordlists/2.txt
pause
graphics card is: amd radeon hd 6300m series

status says: HWMon.GPU.#1 98% Util, -1c Temp, N/A Fan

tried: fully and properly reinstalling catalyst, using older versions of oclhaschat, using different hccap files and different wordlists, rebooting etc, -w 3 command,

Could try (if anyone thinks could help) :creating, then trying in a seperate windows 7 partition on same laptop

Thanks very, very much.