Anyone been able to get a evga gtx780ti with acx cooling to 640khash?

Highest I can get is around 400.  I'm just guessing different values now.  But the old version could get very close to 650
cudaminer -a scrypt:2048 -d gtx780ti -H 1 -l t15x16 -C 2 -i 0

For vertcoin getting 181khash/sec.  The gpu reaches 1.1Ghz when running cudaminer.  I should be getting over 650.  With the old version gpu would only get up to around 1000mhz.  So now I'm getting 100 more mhz but very bad hash rates.