Scrypt is the realm of ASIC and has been for years - you need to reconfigure your miner software to use skein or groetsl (if either of those work on AMD hardware, you might need a different miner version).
There is NO BLOODY WAY you were getting an actual 3+ Gh/s scrypt mining rate from any GPU, I'd estimate a R9 390X actual Scypt hashrate would be closer to 1 Mh/s (perhaps a little over).
haha ya i was like this doesnt seem correct and so i will go to skein or groetsl and see if that works and hopefully that does and see if it reads on the website. cause once that works then i know i am good
If you go groestl use sgminer, get the updated kernel. I dropped memory clocks on the cards as low as they would go, upped GPU clocks as high as they would go on stock voltage. I've not messed with skein.
ok thank you i seem to have got it working but not sure how to update the kernel (newbie here)
though i have read on other forms my set up it better suited with mining skein but i havent found a miner yet that works and the one on the web site doesnt exist any more
and what % of rejected do most people shoot for?
also side note on why it was showing up at 3+ gh was just due to the miner thats all haha