Topic: Thread concurrency to low on Saphire 4890 Viper X 2GB (Read 675 times)
the card is pretty old id be surprised if anything past 1200 is safe.
Thread concurrency doesn't really matter per itself. What's important is to maximize the hashrate without hardware errors.
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:// -u -p
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?
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://
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?
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