Thread concurrency to low on Saphire 4890 Viper X 2GB

[mgoldfinger]

rather stuck here....

I am playing around with a Saphire 4890 Viper X card and for some reason I can not get the Thread concurrency above 2048, which should be way to low for this card.


currently using CGminer 3.7.2, Windows 7 64-bit, with scrypt:

cgminer --scrypt -I 13 -g 1 -w 128 --thread-concurrency 2048 -o stratum+tcp://<URL> -u <USER> -p <PASS>

Hash rates are good though. At i13 +/- 113khs and at I15 around 150khs


I tried:
- reinstalled Catalyst drivers
- several versions of Cgminer
- I can increase  thread concurrency if i lower --lookup-gap to 3, but this should not be needed at these levels? setting the gap to 3 allows me to inrease thread concurrency to about 3400, which is still less then normal for this card

any ideas?

[Wipeout2097]

Thread concurrency doesn't really matter per itself. What's important is to maximize the hashrate without hardware errors.

[RW02]

the card is pretty old id be surprised if anything past 1200 is safe.