R9 270x 100% Errors Scrypt Mining

[Useless1d1ot]

I'm using MultiMiner and I've tried two pools. If I don't use any arguments, it gets 16-17 kHash.
If I use the arguments:
-I 19 -g 1 -w 256 --thread-concurrency 16384

I get 100% errors and the same with even just -I 19.

I'm not sure what else to do? I get accepted shares with no arguments but it's so slow. What driver should I be using? Does anybody have experience with this card?

[Meska]

Lower your intensity and your TC (thread  concurrency).
For the hardware error, it's usually the TC


You can also play with :

Code:

--gpu-powertune 20 --gpu-threads 2[code]

I have a 280x so not sure, but something like :
[code]--gpu-threads 2 --gpu-powertune 20 --thread-concurrency 8192 --temp-target 80 --scan-time 1 --queue 0 --intensity 13 --lookup-gap 2

Give me the best result.
Putting more in TC give me too much hardware errors.

(but yes, it's a 280x, so maybe it's not the same).[/code][/code]

[Useless1d1ot]

Run it with CGMiner and you should get 475 khs.

cgminer --scrypt -o http://yourpool.com:PORT -u user -p password --thread-concurrency 21504 -I 20 -g 1 -w 256



~BCX~

Thanks. I will try running it seperately. I really liked the MultiMiner solution, but I'll give cgminer another go. I'm assuming you used the newest CGminer with those settings or...?

[traderman]

those kind of error usually happen from not enough system ram.

I'm using MultiMiner and I've tried two pools. If I don't use any arguments, it gets 16-17 kHash.
If I use the arguments:
-I 19 -g 1 -w 256 --thread-concurrency 16384

I get 100% errors and the same with even just -I 19.

I'm not sure what else to do? I get accepted shares with no arguments but it's so slow. What driver should I be using? Does anybody have experience with this card?

[aznatama]

The hardest part if finding YOUR specific card's TC/mem clock/core clock ratio.  I used "common" settings for my 7870, and was only getting ~300.  a small change to the above mentioned settings gave be 360kh/s stable at i19 (whereas it used to randomly crash drivers at i18/i19).

Read the readme.scrypt in the cgminer files and start from there.

Good luck with your optimization.

[iGotSpots]

Try a lower intensity, like i13. I had one build that was HW errors above 13 no matter what, but on I 13, it still hashed faster than anything else I had on i19

Bet it fixes it  

[Useless1d1ot]

Still getting errors. CGminer won't work at all.

Which settings are appropriate for BFGminer?

[TimPrice]

Did you try -I 13?
How much RAM you have?
How many cards? OS? Drivers?
Try --shaders option and other versions of cgminer, 2.11.*, 3.1.*, 3.4.*, ...

[glitchboy]

Do not set "--thread-concurrency" by yourself. cgminer/bfgminer picks the best value for your card automatically.

[aznatama]

^ not really.  it's only a vague starting point.

If you read the readme.scrypt, it will tell you to start with shaders * 4.  you will need to adjust from there.

[pontiacg5]

A thread concurrency is good if CGminer starts. If you try to use a TC too high CGminer will never start, it will even tell you you've set the TC too high and run out of memory. You are using the gpu use sync objects and gpu max alloc percent setx commands, right?

Look up settings for a 7870 and start there. This is a 7870 of mine, gets about 400kh/s

--intensity 19 -g 1 --worksize 256 --lookup-gap 2 --thread-concurrency 16384 --gpu-threads 1 --gpu-engine 915 --gpu-memclock 1250

Also, as stated above you always want to specify a TC, NOT shaders. Calling out shaders is pointless if you use TC, and CGminer hardly ever picks a good TC on its own.

The only other thing I would try is switching up to two threads, but 7870's don't seem to like this. Be sure to get I13 in there, otherwise it will do nothing but hardware errors.

-g 2 -I 13 --worksize 256 --lookup-gap 2