LTC mining with Reaper on a 7970 | Bitcointalksearch.org

#Darren

sr. member

Activity: 784

Merit: 250

DIA | Data infrastructure for DeFi

Quote from: Vorksholk on April 06, 2013, 03:59:38 PM

Quote from: #Darren on April 06, 2013, 02:51:16 PM

Quote from: Vorksholk on April 06, 2013, 11:51:30 AM

You don't have to put the cards in crossfire

The only detriment to performance with a multi-GPU system is increased heat. If your computers don't ventilate well (small areas, etc.) then two cards in the same place might just be too much heat and cause some throttling. If you have good (air or water or oil) cooling, you should be good to go.

Nice, thanks

Can you clarify if I can just keep running reaper with the same configuration when I add the second GPU? Or will I have to make some sort of changes (like running it twice, or changing the concurrency)?

Yeah, if you used the device 0 setting you will need to add device 1 as well. That's about it for all of that stuff, since they are the same card they should work with the same threadconc.

Thanks again,

are you saying the reaper config file should look like this?

Quote

kernel reaper.cl
save_binaries yes
enable_graceful_shutdown no
long_polling yes
device 0
# device 1

mine litecoin

Vorksholk

legendary

Activity: 1713

Merit: 1029

Quote from: #Darren on April 06, 2013, 02:51:16 PM

Quote from: Vorksholk on April 06, 2013, 11:51:30 AM

You don't have to put the cards in crossfire

The only detriment to performance with a multi-GPU system is increased heat. If your computers don't ventilate well (small areas, etc.) then two cards in the same place might just be too much heat and cause some throttling. If you have good (air or water or oil) cooling, you should be good to go.

Nice, thanks

Can you clarify if I can just keep running reaper with the same configuration when I add the second GPU? Or will I have to make some sort of changes (like running it twice, or changing the concurrency)?

Yeah, if you used the device 0 setting you will need to add device 1 as well. That's about it for all of that stuff, since they are the same card they should work with the same threadconc.

peacefulmind

full member

Activity: 196

Merit: 100

I have pulled my hair out over the last week over 7970s.

See last post here:https://bitcointalk.org/index.php?topic=117221.520

Quote from: peacefulmind on April 06, 2013, 02:36:06 PM

Taco can you take a look at my problem quoted below?

Quote

Okay - need some help on this anomaly.

First rig - Sapphire 7970 standard edition with Vapor X, used settings suggested in Taco's thread - out of the box 650k/H per second.

Second rig - two (2x) Sapphire 7970 "GHZ Editions", used exact same settings in Taco's thread - out of the box - only about 350 k/H per second.

I have spent the last week in "newbie purgatory" so have been unable to discuss this issue. Finally on the second rig, I was able to get 500k/H per second/card by putting aggression back to 13, and overclocking the memory to 1680Mhz.

Can anyone tell me WHY do two of the same brand/manufacturer, same model, have such huge variance in performance?

Why would the two "Ghz editions" VASTLY under-perform the standard one?

Does anyone have any suggestions experience with a Sapphire "GHZ Edition" that could explain the variance? The standard one was plug and play @ 650k. The better ones have taken a week of tweaking to even reach 500k/H, and NONE of the recommended settings worked. I know it is not bad cards because they both perform the same - what is different about the "GHZ editions" that is hurting them so much, and made them so finicky?

First rig is Q6600 65nm, 4GB DDR2, PCI-E 2.0, Win7 Pro 64, Sapphire 7970 - 650kH/s

Second rig is 22nm Quad i5 Ivy Bridge, 8GB DDR3, PCI-E 3.0, Win7 Pro 64, 2 x Sapphire 7970 "GHZ Editions" - 990kH/s (both cards)

I followed all instructions in this thread. The second rig would only do about 300 per card until I overclocked the RAM on both cards to 1700Mhz and dialed back aggression to 13. Any variance from that setting and I get LESS than 500kH per card.

I would REALLY like to get the potential out of these supposedly "better" Sapphire 7970 Ghz editions.

#Darren

sr. member

Activity: 784

Merit: 250

DIA | Data infrastructure for DeFi

Quote from: Vorksholk on April 06, 2013, 11:51:30 AM

You don't have to put the cards in crossfire

The only detriment to performance with a multi-GPU system is increased heat. If your computers don't ventilate well (small areas, etc.) then two cards in the same place might just be too much heat and cause some throttling. If you have good (air or water or oil) cooling, you should be good to go.

Nice, thanks

Can you clarify if I can just keep running reaper with the same configuration when I add the second GPU? Or will I have to make some sort of changes (like running it twice, or changing the concurrency)?

Vorksholk

legendary

Activity: 1713

Merit: 1029

You don't have to put the cards in crossfire

The only detriment to performance with a multi-GPU system is increased heat. If your computers don't ventilate well (small areas, etc.) then two cards in the same place might just be too much heat and cause some throttling. If you have good (air or water or oil) cooling, you should be good to go.

#Darren

sr. member

Activity: 784

Merit: 250

DIA | Data infrastructure for DeFi

Quote from: W-M on April 06, 2013, 06:23:32 AM

I'm not really sure if you have to link them using Crossfire or if the script works on both cards separately

hmm good point

I was sort of figuring that with the cards being linked together the script would just automatically use them both, but I may be wrong...

W-M

full member

Activity: 210

Merit: 100

In Crypto we Trust.

Quote from: #Darren on April 06, 2013, 06:13:46 AM

Can anyone tell me...

if I rig up 2 7970's on one mother board and "link them", will that be just as effective as having them in separate pc's, or would there be some sort of performance loss?

I'm not an expert, but I believe they should be equally effective. In fact, it would be even better for you, because you won't have to pay for the extra electricity for the second motherboard/CPU/etc. I'm not really sure if you have to link them using Crossfire or if the script works on both cards separately, but they should be just as effective of having them in different PC's.

#Darren

sr. member

Activity: 784

Merit: 250

DIA | Data infrastructure for DeFi

Can anyone tell me...

if I rig up 2 7970's on one mother board and "link them", will that be just as effective as having them in separate pc's, or would there be some sort of performance loss?

rclljj

newbie

Activity: 17

Merit: 0

very usefull
3ks for it

btcwalker

newbie

Activity: 24

Merit: 0

Quote from: romantic1 on March 03, 2013, 08:35:44 AM

Quote from: cdog on March 03, 2013, 06:35:59 AM

Im trying to decide between an 5970 and a 7970, buying a used card for gaming and LTC mining, putting price aside, which is better?

It seems a lot of people here have issues with their 7970 for LTC, I want a card thats hassle free as I dont want to tweak configs all day...

Thanks

7970 is very good for ltc ! See: https://bitcointalksearch.org/topic/hd7970-over-700khs-with-reaper-guide-148274

Please, show your ripper settings.
I didn't got more than 560 khash\s with 7970 even with 1160 mhz core
https://bitcointalksearch.org/topic/m.1271092

romantic1

member

Activity: 102

Merit: 10

Quote from: cdog on March 03, 2013, 06:35:59 AM

Im trying to decide between an 5970 and a 7970, buying a used card for gaming and LTC mining, putting price aside, which is better?

It seems a lot of people here have issues with their 7970 for LTC, I want a card thats hassle free as I dont want to tweak configs all day...

Thanks

7970 is very good for ltc ! See: https://bitcointalksearch.org/topic/hd7970-over-700khs-with-reaper-guide-148274

BBQKorv

sr. member

Activity: 280

Merit: 250

I would go for 7970 (GHz?), even the resale value alone is enough encouragement for me. After your done with mining on that card you will have better resale value and that directly adds more on the total profit of your operation.

btcwalker

newbie

Activity: 24

Merit: 0

Quote from: cdog on March 03, 2013, 06:35:59 AM

Im trying to decide between an 5970 and a 7970, buying a used card for gaming and LTC mining, putting price aside, which is better?

It seems a lot of people here have issues with their 7970 for LTC, I want a card thats hassle free as I dont want to tweak configs all day...

Thanks

Most of 7970 is not efficient in LTC mining, it works like 90% of 7950 in my case (7970 MSI Lightning vs 7950 PowerColor)
so if you want to mine LTC, 7970 is not good choice but for BTC and gaming its perfomance is awesome

cdog

hero member

Activity: 1036

Merit: 500

Im trying to decide between an 5970 and a 7970, buying a used card for gaming and LTC mining, putting price aside, which is better?

It seems a lot of people here have issues with their 7970 for LTC, I want a card thats hassle free as I dont want to tweak configs all day...

Thanks

Badonkadonk

hero member

Activity: 560

Merit: 500

Quote from: Aseras on October 19, 2012, 10:37:33 AM

I can make my 7970's say they are getting more than 800khash and reaper report 0 hw errors, but they are all rejects. same with cgminer in scrypt. If you push it too hard it just spits out garbage and thinks it's working fine, but you aren't accomplishing anything. The only way to tell is to monitor it from the pool side and watch the rejects.

pool-x was reporting 637 off that worker Wink

2-3% rejected... but i went back to btc mining... cba pumping and dumping ltc.

Aseras

hero member

Activity: 658

Merit: 500

I can make my 7970's say they are getting more than 800khash and reaper report 0 hw errors, but they are all rejects. same with cgminer in scrypt. If you push it too hard it just spits out garbage and thinks it's working fine, but you aren't accomplishing anything. The only way to tell is to monitor it from the pool side and watch the rejects.

Badonkadonk

hero member

Activity: 560

Merit: 500

7950 @~650kh 1175/1775 1150 core voltage. ~80c / cant be to hard to push a 7970 over 800kh can it? Tongue

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

superfastkyle

sr. member

Activity: 437

Merit: 250

your findings are almost identical to mine

Quote from: philips on October 16, 2012, 08:05:09 PM

The est I could squeeze out of a 7970 was 576 Kh/s (as reported by pool) with cgminer. I will buy some more RAM and try again from scratch.

philips

hero member

Activity: 700

Merit: 500

Quote from: tacotime on October 15, 2012, 11:26:21 PM

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

What was the maximum Kh/s you obtained from a 7970 as reported by the pool?

I am asking this because in every single test I made with various cards Ati or Nvidia reaper is always reporting significantly higher values than cgminer, while the pool itself reports equal values (in some cases cgminer slightly higher). Reaper just pretends higher values in my experience.

The best I could squeeze out of a 7970 was 576 Kh/s (as reported by pool) with cgminer. I will buy some more RAM and try again from scratch.

tacotime

legendary

Activity: 1484

Merit: 1005

Quote from: superfastkyle on October 16, 2012, 05:55:42 PM

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

Topic: LTC mining with Reaper on a 7970 (Read 33008 times)