Topic: High Error Rate vs. Poor Performance on new 7850, scrypt mining (Read 528 times)

It is also used for gaming, and browsing like this.

Thanks.

Is this your normal computer you use for mining and web browsing, etc? Or a mining rig? If its a rig, I'd say use bamt... Dead simple, can't go wrong, especially with 7xxx & R9 cards

-thread-concurrency 4096 -I 16 -w 256 -g 1

results in this.

 cgminer version 3.7.2 - Started: [2014-04-04 13:37:00]
------------------------------------------------------------------------------
 (5s):310.1K (avg):300.1Kh/s | A:64  R:0  HW:499  WU:18.1/m
 ST: 2  SS: 0  NB: 2  LW: 18  GF: 0  RF: 0
 Connected to crypto-coin-pool.com diff 16 with stratum as user EC488.CG6850
 Block: 27fef98f...  Diff:5.75K  Started: [13:38:48]  Best share: 116
------------------------------------------------------------------------------
 [P]ool management [G]PU management [ S ]ettings [D]isplay options [Q]uit
 GPU 0:  53.9C 1923RPM | 299.9K/300.1Kh/s | A:64 R:0 HW:505 WU:18.1/m I:16
------------------------------------------------------------------------------

 [2014-04-04 13:36:59] Started cgminer 3.7.2
 [2014-04-04 13:36:59] Probing for an alive pool
 [2014-04-04 13:37:00] Pool 0 difficulty changed to 32
 [2014-04-04 13:37:00] Network diff set to 5.75K
 [2014-04-04 13:37:44] Pool 0 difficulty changed to 16
 [2014-04-04 13:37:44] Accepted 07fdf9c8 Diff 32/32 GPU 0
 [2014-04-04 13:37:48] Accepted 0ab0f6e9 Diff 24/16 GPU 0
 [2014-04-04 13:38:29] Accepted 02354146 Diff 116/16 GPU 0
 [2014-04-04 13:38:48] Stratum from pool 0 detected new block

That gets me this.



 [2014-04-04 12:55:03] Started cgminer 3.7.2
 [2014-04-04 12:55:03] Started cgminer 3.7.2
 [2014-04-04 12:55:03] Probing for an alive pool
 [2014-04-04 12:55:03] Pool 0 difficulty changed to 32
 [2014-04-04 12:55:04] Maximum buffer memory device 0 supports says 536870912
 [2014-04-04 12:55:04] Your scrypt settings come to 671154176
 [2014-04-04 12:55:04] Error -61: clCreateBuffer (padbuffer8), decrease TC or in
crease LG
 [2014-04-04 12:55:04] Failed to init GPU thread 0, disabling device 0
 [2014-04-04 12:55:04] Restarting the GPU from the menu will not fix this.
 [2014-04-04 12:55:04] Try restarting cgminer.
Press enter to continue:

Thanks, but I haven't messed with that lately, I recall I had issues with whatever values I tried the past on the 6850, so I just gave it up and let cgminer pick out those values.  I will try setting mine at 16000 like yourself.  But I also thought, might be wrong, that it was a multiple of the shaders, a low number something like 4 times.

Thanks.


Update:

[2014-04-04 12:51:33] Started cgminer 3.7.2
[2014-04-04 12:51:33] Started cgminer 3.7.2
[2014-04-04 12:51:33] Probing for an alive pool
[2014-04-04 12:51:34] Pool 0 difficulty changed to 32
[2014-04-04 12:51:40] Maximum buffer memory device 0 supports says 536870912
[2014-04-04 12:51:40] Your scrypt settings come to 1048576000
[2014-04-04 12:51:40] Error -61: clCreateBuffer (padbuffer8), decrease TC or in
rease LG
[2014-04-04 12:51:40] Failed to init GPU thread 0, disabling device 0
[2014-04-04 12:51:40] Restarting the GPU from the menu will not fix this.
[2014-04-04 12:51:40] Try restarting cgminer.
ress enter to continue:

with "--shaders 1024 -I 18 --thread-concurrency 16000"

You are missing critical flags.

Make your batchfile this:

The only time I have had artifacts was when the card was defective. Setting issues have only caused me to have freezing/crashing problems.

What TC are you running? I own a Gigabyte 7850 2GB card and I run my TC at 16000 at -I 18 with no errors hashing at 365khs~370khs.

I just received this Powercolor 7850 from the egg, http://www.newegg.com/Product/Product.aspx?Item=N82E16814131562, and I have been having problems getting it run run faster than my 6850.

I've set the intensity to 12 and I still get HW errors.  I also get artifacts.  

I've set my batch file with;

cgminer --scrypt -o [removed pool and workers] --shaders 1024 -I 12


 cgminer version 3.7.2 - Started: [2014-04-04 11:57:51]
-------------------------------------------------------------------------------
 (5s):222.4K (avg):225.6Kh/s | A:3088  R:0  HW:49  WU:149.3/m
 ST: 2  SS: 0  NB: 9  LW: 112  GF: 0  RF: 0
 Connected to removed
 Block: 5f40cb59...  Diff:5.75K  Started: [12:12:25]  Best share: 1.56K
-------------------------------------------------------------------------------
 [P]ool management [G]PU management [ S ]ettings [D]isplay options [Q]uit
 GPU 0:  54.1C 1917RPM | 222.3K/225.6Kh/s | A:3088 R:0 HW: 49 WU:149.3/m I:12
-------------------------------------------------------------------------------

 [2014-04-04 12:16:28] Accepted 051200c6 Diff 50/32 GPU 0
 [2014-04-04 12:16:56] Accepted 033ec577 Diff 79/32 GPU 0
 [2014-04-04 12:17:34] Accepted 04658004 Diff 58/32 GPU 0
 [2014-04-04 12:18:07] Accepted 066139d2 Diff 40/32 GPU 0
 [2014-04-04 12:19:18] Accepted 03afd41f Diff 69/32 GPU 0
 [2014-04-04 12:19:26] Accepted 05476ad1 Diff 48/32 GPU 0
 [2014-04-04 12:19:40] Accepted 03ee95a3 Diff 65/32 GPU 0
 [2014-04-04 12:20:00] Accepted 0207754b Diff 126/32 GPU 0
 [2014-04-04 12:20:00] Accepted 01422215 Diff 203/32 GPU 0
 [2014-04-04 12:20:05] Accepted 0599d0a2 Diff 46/32 GPU 0
 [2014-04-04 12:20:06] Accepted 060e993b Diff 42/32 GPU 0
 [2014-04-04 12:20:11] Accepted 03826d24 Diff 73/32 GPU 0
 [2014-04-04 12:20:16] Accepted 07ad8711 Diff 33/32 GPU 0

The thing that isn't funny, I've been running my 6850 1GB from Gigabyte for months at I 16 without specifying any other type of variables and it runs at 225KHs with rarely an error and never artifacts.  I tried the same with this 7850 and have had zero accepts at I 16.  My novice tuning hasn't resulted in much either.  

Other GPU benchmarks seem to place the 7850 at about par with other 7850s.  So, I'm not sure if I just have to do special tuning with this powercolor 7850 or if the card is garbage or what?

Help, ideas?

Thanks.