start /realtime cgminer.exe --scrypt -o stratum+tcp://us-east.multipool.us:7777 -u yourworker.1 -p password --thread-concurrency 22516 -g 1 --lookup-gap 2 -w 512 -I 20
The average hashrate we got from the cards running at stock frequencies of 947 MHz GPU and 1250 MHz video memory got us about 857 KH/S per card or a total hashrate of about 3.4 MH/S. This is what is considered a fairly good results for Radeon R9 290 cards and unfortunately overclocking these cards did not help us in getting higher hashrate, not that we wanted to overclock them as they are already getting quite hot mining Scrypt cryptos. It seems that XFX’s cooling is not that great for mining crypto coins as the temperatures of the VRMs gets easily over 100 degrees Celsius and that is not that great for 24/7 mining even though they are probably rated at up to about 120 degrees C or even a bit more.
One very important thing in making the AMD Radeon R9 290 or 290X cards is how you call up the cgminer, because you need to use a high thread concurrency value that often tends to bring some issues with cgminer. In order to ensure that you can start cgminer without problems you can start by using the command lines below to call cgminer.exe from a BAT file: