LTC mining with Reaper on a 7970 - page 2.

superfastkyle

sr. member

Activity: 437

Merit: 250

Do you remember when I called you out on saying "personally", or did you forget that already. I'm actually starting to enjoy these bitcoin forums, at first I was mad about all the scams/liars here but now I just hope I can use my new found lie detecting skills in more real life situations

Quote from: tacotime on October 16, 2012, 11:28:47 AM

Quote from: superfastkyle on October 16, 2012, 03:06:17 AM

oh wow what did I tell you tacotime can't get 700kh on a 7970 after all. If it was really possible to get an extra 20% from a 7970 why wouldn't a 7970 run much cooler when running at 550kh it does bitcoin mining at the same clock speeds? Surely enough to make up for a little bit of heat caused by extra ram usage. People still don't believe me on calling out bfl's lies but I did pretty good job here.

I was going by what other people told me. I'm sure we'll get some extra kh/s out of it when the kernel gets ironed out.

tacotime

legendary

Activity: 1484

Merit: 1005

Quote from: superfastkyle on October 16, 2012, 03:06:17 AM

oh wow what did I tell you tacotime can't get 700kh on a 7970 after all. If it was really possible to get an extra 20% from a 7970 why wouldn't a 7970 run much cooler when running at 550kh it does bitcoin mining at the same clock speeds? Surely enough to make up for a little bit of heat caused by extra ram usage. People still don't believe me on calling out bfl's lies but I did pretty good job here.

I was going by what other people told me. I'm sure we'll get some extra kh/s out of it when the kernel gets ironed out.

Rjb82

newbie

Activity: 57

Merit: 0

i think my personal best was 1100/1800 on my 7950 with the same settings (except concurrency, mine was 24576, and i run 19 aggression, so i can atleast still move stuff around)... and i THINK i was around 640's. i KNOW i was above 625.

I get 612 out of 1k/1750.

1850 locks up. and 1800 was... not entirely stable... it'd crash the driver after a few random hours. 1750 for days. it's a gigabyte 3 fan card. I forget the model #.

For simplicity sake i run 1k/1575 (max CCC lets me do) since i game on it also.

superfastkyle

sr. member

Activity: 437

Merit: 250

oh wow what did I tell you tacotime can't get 700kh on a 7970 after all. If it was really possible to get an extra 20% from a 7970 why wouldn't a 7970 run much cooler when running at 550kh it does bitcoin mining at the same clock speeds? Surely enough to make up for a little bit of heat caused by extra ram usage. People still don't believe me on calling out bfl's lies but I did pretty good job here.

tacotime

legendary

Activity: 1484

Merit: 1005

Quote from: luffy on October 15, 2012, 04:51:41 AM

@tacotime,
how much system RAM is occupied for these reaper settings?

~1.3 GB

I'm in the same boat as you guys, I can not get 700 kh/s out of a 7970. i'll have to experiment when i get more time

luffy

hero member

Activity: 607

Merit: 500

@tacotime,
how much system RAM is occupied for these reaper settings?

btcwalker

newbie

Activity: 24

Merit: 0

Quote from: tacotime on October 14, 2012, 05:06:59 PM

bump with settings for 760kh/s

http://i.piccy.info/i7/eef9270eec21626fce47de4a5b0bfafe/4-47-398/10015963/760.jpg

using catalyst 12.6 and app sdk 2.6

I just tried reaper configuration you provided on pic.
My system is:
OS: Win 7 x64
Drivers\sdk: Catalyst 12.6, sdk 2.6
Card: 7970, 1160mHz core, 1400mHz memory
Reaper: reaperv13beta4_64

The only difference I see is memory frequency (1850 instead of my 1400). The result is 385khash\s for 7970 and the weird thing is that my 7950 (1000mhz core \ 1375mhz memory) gives ~600khash\s, so I don't expect that increasing memory frequency will give much influence on the results, but I will try to check it later because it requires overclocking.

tacotime

legendary

Activity: 1484

Merit: 1005

http://i50.tinypic.com/1j9mw0.jpg

DiCE1904

legendary

Activity: 1118

Merit: 1002

Quote from: tacotime on October 14, 2012, 05:06:59 PM

bump with settings for 760kh/s

http://i.piccy.info/i7/eef9270eec21626fce47de4a5b0bfafe/4-47-398/10015963/760.jpg

using catalyst 12.6 and app sdk 2.6

link isnt working for me

tacotime

legendary

Activity: 1484

Merit: 1005

bump with settings for 760kh/s

http://i.piccy.info/i7/eef9270eec21626fce47de4a5b0bfafe/4-47-398/10015963/760.jpg

using catalyst 12.6 and app sdk 2.6

btcwalker

newbie

Activity: 24

Merit: 0

Quote from: tacotime on October 14, 2012, 12:03:45 PM

if you can mine at aggression 20 you should be able also to mine at aggression 16. but i guess if that's not the case that's not the case.

you could try,

Code:

worksize 256
vectors 1
aggression 16
threads_per_gpu 1
sharethreads 32
lookup_gap 2
gpu_thread_concurrency 34816

If the thread concurrency is within the correct range and threads_per_gpu set to 1 you should not get stales with high aggressions. But these cards act really weird and it's hard to tell why they do the things they do sometimes.

I just retried this agression with config you provided. It seems that previous hardware errors on that agression, I said about before, were because of something different. But this config doesn't provide any benefit for 7970, the result is 370khash\s.

tacotime

legendary

Activity: 1484

Merit: 1005

if you can mine at aggression 20 you should be able also to mine at aggression 16. but i guess if that's not the case that's not the case.

you could try,

Code:

worksize 256
vectors 1
aggression 16
threads_per_gpu 1
sharethreads 32
lookup_gap 2
gpu_thread_concurrency 34816

If the thread concurrency is within the correct range and threads_per_gpu set to 1 you should not get stales with high aggressions. But these cards act really weird and it's hard to tell why they do the things they do sometimes.

btcwalker

newbie

Activity: 24

Merit: 0

Quote

Maybe a stupid question, but have you tried aggression 16? This is about 30% faster than aggression 13 on my 7770.

yes, I did, and the result is 100% hardware errors reported by reaper. 13 and 20 aggressions are working well only.

tacotime

legendary

Activity: 1484

Merit: 1005

Quote from: btcwalker on October 14, 2012, 03:32:56 AM

The best config for 7970 is (565khash\s):

Quote

worksize 256
vectors 1
aggression 13
threads_per_gpu 1
sharethreads 32
lookup_gap 2
gpu_thread_concurrency 34816

Maybe I will continue experiments to find the better config. But it seems that 7970 is better for BTC mining because it is not hard to get ~700mhash\s

Maybe a stupid question, but have you tried aggression 16? This is about 30% faster than aggression 13 on my 7770.

Badonkadonk

hero member

Activity: 560

Merit: 500

was having some issues with my 7950`s when i switched to ltc mining, low speeds and loads of rejected / stale shares.

i solved my problem with going solo minig and changing to cgminer with "cgminer --scrypt -o 127.0.0.1:9332 -u username -p password --shaders 1792 -I 18 -w 256 -v 1 -g 1"

clocking my cards at 1000/1775 im getting ~600kh on each but tuned it down to 900/1675 to lower my heat issues and pumping out ~550kh each...

you should be able to pump out ~700kh with those settings

btcwalker

newbie

Activity: 24

Merit: 0

The following results have been achieved:

http://imageshack.us/a/img266/5644/7970reapertests.png

The best config for 7970 is (565khash\s):

Quote

worksize 256
vectors 1
aggression 13
threads_per_gpu 1
sharethreads 32
lookup_gap 2
gpu_thread_concurrency 34816

Maybe I will continue experiments to find the better config. But it seems that 7970 is better for BTC mining because it is not hard to get ~700mhash\s

tacotime

legendary

Activity: 1484

Merit: 1005

try these thread concurrencies with aggression 20 and worksize 64, threads_per_gpu 1

16384
17408
18432
19456
20480
21504
22528
23552
24576
25600
26624
27648
28672
29696
30720
31744
32768
33792
34816

at some point on the low end you'll get lots of HW errors and at some point on the high end you'll get a really slow speed. at some point in between you'll find your optimum thread_concurrency. unfortunately no one can tell you what that is, you need to experiment.

btcwalker

newbie

Activity: 24

Merit: 0

Something strange are going.

Quote

worksize 256
vectors 1
aggression 20
threads_per_gpu 1
sharethreads 32
lookup_gap 2
gpu_thread_concurrency 24576

I got ~600khash\s with that config on 7950 xfx black 1000mhz core \ 1375mhz memory

but

I got ~360khash\s with that config on 7970 msi lightning 1160mhz core \ 1400mhz memory

and the maximum I got from 7970 is ~550khash\s when the following config was used:

Quote

worksize 256
vectors 1
aggression 13
threads_per_gpu 4
sharethreads 32
lookup_gap 2
gpu_thread_concurrency 8192

May be I am doing something wrong? Why 7970 with greater clocks and hardware power are worse on the same config?

meebs

hero member

Activity: 616

Merit: 500

also keep in mind that memory clock matters.. core clock does NOT have to be as high as BTC mining formax hash rate.

on my 7950 my LTC hash rate is the same if my core is set to 1000 or 1175. Keep that in mind.. If i drop the core down to 930, then I lose about 2-3% speed. Note that this results in a pretty good power savings over BTC mining as it takes quite a lot less voltage and wattage to run the card at 1000 vs 1175

also with the settings above on two cards I am getting a combined speed of 1150 khash.

tacotime

legendary

Activity: 1484

Merit: 1005

Quote from: Tomatocage on September 29, 2012, 12:27:02 PM

Hmm, thanks. I still can't get past my inability to use anything beyond 8192 for gpu_thread_concurrency in litecoin.conf. Is there any other file I should be editing? My reaper.conf file looks like this:

Your reaper.conf should look like:

Code:

kernel reaper.cl
save_binaries yes
enable_graceful_shutdown no
long_polling yes

mine litecoin

your litecoin.conf should look like:

Code:

worksize 256
vectors 1
aggression 20
threads_per_gpu 1
sharethreads 32
lookup_gap 2
gpu_thread_concurrency 24576

Topic: LTC mining with Reaper on a 7970 - page 2. (Read 33008 times)