Sapphire 11197-03-40G (7970) - need help optimizing for LTC mining

frediiii

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Activity: 335

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Quote from: Frizz23 on April 11, 2013, 11:41:09 PM

[...] the best one for LTC mining is the bog-standard Sapphire 7970. It does 680 Kh/s with no overclocking.

No idea why the other, much more expensive (and supposedly faster), Sapphire 7970s cards are much slower mining LTC.

I second that. I have a standard sapphire running at 688.8 Kh/s average with stock settings. it's Club3d 7970 neighbor pulls 652 Kh/s stock.

Frizz23

hero member

Activity: 1162

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Quote from: Martok88 on April 11, 2013, 05:06:24 PM

I've got 2 of these cards so far, each hitting ~580 Kh/s with stock settings.

I have tried lots of Sapphire 7970 cards (Vapor-X, OC, GHz Edition, 3 and 6GB versions, etc. ...), but the best one for LTC mining is the bog-standard Sapphire 7970. It does 680 Kh/s with no overclocking.

No idea why the other, much more expensive (and supposedly faster), Sapphire 7970s cards are much slower mining LTC.

Marrs

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Activity: 112

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My final settings are: --gpu-powertune 20 --gpu-fan 0-100 --gpu-engine 1024 --gpu-memclock 1692 -I 13 -w 256 --thread-concurrency 8192 -g 2

Your card may not overclock the same as mine. You might be able to go higher, or not as high.

Martok88

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Activity: 282

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Quote from: Marrs on April 11, 2013, 07:28:15 PM

Quote from: Martok88 on April 11, 2013, 07:22:59 PM

Quote from: Marrs on April 11, 2013, 06:33:23 PM

I get 700khs at 1024/1692, 8192 tc, 2 gpu threads, 13 intensity.

That specific ratio of core to memory seems to be the sweet spot for my sapphire 7970. I raised my memory as high as I could while keeping the system stable, then set the core using that ratio.

Thanks for the input. Do you have the exact same card, and what software did you use to OC?

Yes, I have that card exactly. I just use the core and memclock parameters (and power boost for stability) with cgminer.

Maybe the power boost is what I'm missing. What did you set yours to?

Marrs

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Activity: 112

Merit: 10

Quote from: Martok88 on April 11, 2013, 07:22:59 PM

Quote from: Marrs on April 11, 2013, 06:33:23 PM

I get 700khs at 1024/1692, 8192 tc, 2 gpu threads, 13 intensity.

That specific ratio of core to memory seems to be the sweet spot for my sapphire 7970. I raised my memory as high as I could while keeping the system stable, then set the core using that ratio.

Thanks for the input. Do you have the exact same card, and what software did you use to OC?

Yes, I have that card exactly. I just use the core and memclock parameters (and power boost for stability) with cgminer.

Martok88

sr. member

Activity: 282

Merit: 250

SteamBitShop.com

Quote from: Marrs on April 11, 2013, 06:33:23 PM

I get 700khs at 1024/1692, 8192 tc, 2 gpu threads, 13 intensity.

That specific ratio of core to memory seems to be the sweet spot for my sapphire 7970. I raised my memory as high as I could while keeping the system stable, then set the core using that ratio.

Thanks for the input. Do you have the exact same card, and what software did you use to OC?

Marrs

member

Activity: 112

Merit: 10

I get 700khs at 1024/1692, 8192 tc, 2 gpu threads, 13 intensity.

That specific ratio of core to memory seems to be the sweet spot for my sapphire 7970. I raised my memory as high as I could while keeping the system stable, then set the core using that ratio.

Martok88

sr. member

Activity: 282

Merit: 250

SteamBitShop.com

Quote from: pekv2 on April 11, 2013, 05:07:33 PM

Give this a read.

Consolidated Litecoin Mining Guide for 5xxx, 6xxx, and 7xxx GPUs

Thanks. I had read the guide before, but found someone's settings in the thread that pushed my cards up to ~635 Kh/s (1044 core, 1500 mem)
I'm still hoping for 700+ though, if anyone has any further advice.

ckolivas was able to get the memory clock up to 1900 stable: https://bitcointalksearch.org/topic/m.1635964

pekv2

hero member

Activity: 770

Merit: 502

Give this a read.

Consolidated Litecoin Mining Guide for 5xxx, 6xxx, and 7xxx GPUs

Martok88

sr. member

Activity: 282

Merit: 250

SteamBitShop.com

I've got 2 of these cards so far, each hitting ~580 Kh/s with stock settings.
I'm trying to overclock the memory and core for better rates, however they become unstable at about 1575 MHz memory clock, which seems pretty low.
This could have something to do with the "boost" feature, but I'm not really sure.
I'd really appreciate it if someone could point me in the right direction to get higher memory speeds.

Topic: Sapphire 11197-03-40G (7970) - need help optimizing for LTC mining (Read 4227 times)