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Topic: Consolidated Litecoin Mining Guide for 5xxx, 6xxx, and 7xxx GPUs - page 25. (Read 624200 times)

matauc12

hero member

Activity: 658

Merit: 500

Quote from: tacotime on March 15, 2013, 08:38:38 AM

Quote from: matauc12 on March 15, 2013, 08:05:22 AM

I just want to advice people, although the gigabyte 7950 WF3 looks like a good buy, its complete POS. They come with a hardware locked core of 1.25 (default is supposed to be 1v ish) none of them over clocks higher than 1000/1450 and they run at 80c.

I have 5 of them unfortunately So getting roughly 580khs from cards that could get much more.

None of mine are hardware locked. Sad

Sad

I'll try and post a pic of my pcb after, wondering if they did a silent revision.

I googled and apparently its most that have been bought after December. Has the fx0 bios flashed on both CMOS.

Should also note this crappy new revision also comes with 8pin + 6pin vs 6pinx2

I'm trying to return them and get 3x7970 instead. Will be 300$ more for basically 500khs more, and better resale value. And probably much less hassle too. These 7950s are awful all around. Their temps are alarming, and cause instability. I'd always feel on the edge when leaving for a week (which I often do)

tacotime

legendary

Legendary level

Activity: 1484

Merit: 1005

Quote from: matauc12 on March 15, 2013, 08:05:22 AM

I just want to advice people, although the gigabyte 7950 WF3 looks like a good buy, its complete POS. They come with a hardware locked core of 1.25 (default is supposed to be 1v ish) none of them over clocks higher than 1000/1450 and they run at 80c.

I have 5 of them unfortunately So getting roughly 580khs from cards that could get much more.

None of mine are hardware locked. Sad

Sad

I'll try and post a pic of my pcb after, wondering if they did a silent revision.

tacotime

legendary

Legendary level

Activity: 1484

Merit: 1005

Quote from: -ck on March 15, 2013, 04:39:23 AM

Found a nice awkward bug and the next version of cgminer will fix the high thread concurrencies limitation on 79x0 devices and the intensity 13 limitation.

What was it? I'd like to fix the reaper kernel too if it was a problem with that.

-ck

legendary

Legendary level

Activity: 4088

Merit: 1631

Ruu \o/

Quote from: Flatlinezor on March 15, 2013, 04:43:10 AM

Quote from: -ck on March 15, 2013, 04:39:23 AM

Found a nice awkward bug and the next version of cgminer will fix the high thread concurrencies limitation on 79x0 devices and the intensity 13 limitation.

Oh yeah, I did not check the name sorry. It makes a difference in reaper, not cgminer, I forgot to mention. But I am telling you the truth trust me

Also, very good work on cgminer, and if the next release will indeed lift the intensity/concurrency issue, i'll get back right away from reaper on one of my cards, because the stratum support absence is a pain, applying the proxy all the time. Keep up the cool work!

I'm not sure you want to hear this, but the scrypt kernel in reaper is the same as in cgminer, and it also does not do anything with vector parameters for litecoin mining (strictly speaking, both kernels are fixed to 4 vectors internally).

Anyway thanks. Test builds can be found on the cgminer forum thread.

matauc12

hero member

Activity: 658

Merit: 500

I just want to advice people, although the gigabyte 7950 WF3 looks like a good buy, its complete POS. They come with a hardware locked core of 1.25 (default is supposed to be 1v ish) none of them over clocks higher than 1000/1450 and they run at 80c.

I have 5 of them unfortunately So getting roughly 580khs from cards that could get much more.

sgravina

sr. member

Activity: 451

Merit: 250

I'm switching to litecoin.

Running 2 5870's on a Windows 7 with i7 and 8 GBytes memory.

Code:

cgminer-2.11.2-win32\cgminer ^
--scrypt ^
-o http://newlc.ozco.in:9332 -u username -p password ^
-o localhost:9332 -u username -p password ^
--auto-fan ^
--shaders 1600 ^
--worksize 256 ^
--intensity 18 ^
--gpu-engine 900 ^
--gpu-memclock 1300 ^
-g 1

This works good. I get 415 KHases/sec from each card. But if I set "-g 2" then it crashes. No question here, just sharing.

Now on my Linux box, AMD 2 core Athlon, 2 GBytes Memory. Three 5870 and a 5850. This works:

Code:

cgminer \
-o http://newlc.ozco.in:9332 -u username -p password ^
-o localhost:9332 -u username -p password ^
--scrypt \
-g 1 \
--auto-fan \
--shaders 1600,1600,1600,1440 \
--worksize 256 \
--intensity 16 \
--gpu-memclock 1200,1200,1200,1200 \
--gpu-engine 800,800,800,775

But on an almost identical machine it won't work. Even though I tried a lot of variations of the shown parameters, plus --thread-concurrency. Why?

Would adding more system memory help?

Flatlinezor

member

Activity: 84

Merit: 10

Funny quote

Quote from: -ck on March 15, 2013, 04:39:23 AM

Found a nice awkward bug and the next version of cgminer will fix the high thread concurrencies limitation on 79x0 devices and the intensity 13 limitation.

Oh yeah, I did not check the name sorry. It makes a difference in reaper, not cgminer, I forgot to mention. But I am telling you the truth trust me

Also, very good work on cgminer, and if the next release will indeed lift the intensity/concurrency issue, i'll get back right away from reaper on one of my cards, because the stratum support absence is a pain, applying the proxy all the time. Keep up the cool work!

-ck

legendary

Legendary level

Activity: 4088

Merit: 1631

Ruu \o/

Found a nice awkward bug and the next version of cgminer will fix the high thread concurrencies limitation on 79x0 devices and the intensity 13 limitation.

-ck

legendary

Legendary level

Activity: 4088

Merit: 1631

Ruu \o/

Quote from: ?? on ??

Quote from: -ck on March 14, 2013, 08:04:15 PM

Just a few notes about cgminer that seem to be forgotten with scrypt...

Changing vectors does nothing.
Default lookup gap is 2, so setting 2 or 0 does nothing.
Default gpu threads are 2, so setting 2 does nothing.
Setting thread concurrency overrides shaders, so if you set thread concurrency, setting shaders does nothing.
Intensities over 13 for 79x0 just drops the hashrate or generates garbage so don't do that.
Magic core:mem ratios seem to be entirely hardware dependent: motherboard/CPU/GPU combos change it even for the same 79x0 device.
Magic core:mem ratios work much better on windows. On linux they don't seem to be anywhere near as effective.
Running CPU frequency scaling on linux (or the equivalent on windows) will slow down your GPU hashrate a little, so set your CPU to maximum performance equivalent.

If you want a video, me setting vectors 1 to 2 raising my 7870 to 410 instead of being on 350, without hw errors, let me know. Vectors indeed make a difference, sorry.

Considering I wrote cgminer, and that the vectors value isn't even passed to the kernel, I think I'd know.

flound1129

hero member

Activity: 938

Merit: 1000

www.multipool.us

Quote from: -ck on March 14, 2013, 08:04:15 PM

Just a few notes about cgminer that seem to be forgotten with scrypt...

Changing vectors does nothing.
Default lookup gap is 2, so setting 2 or 0 does nothing.
Default gpu threads are 2, so setting 2 does nothing.
Setting thread concurrency overrides shaders, so if you set thread concurrency, setting shaders does nothing.
Intensities over 13 for 79x0 just drops the hashrate or generates garbage so don't do that.
Magic core:mem ratios seem to be entirely hardware dependent: motherboard/CPU/GPU combos change it even for the same 79x0 device.
Magic core:mem ratios work much better on windows. On linux they don't seem to be anywhere near as effective.
Running CPU frequency scaling on linux (or the equivalent on windows) will slow down your GPU hashrate a little, so set your CPU to maximum performance equivalent.

Thanks that helps

Is there a .conf setting to not submit stales or is that only command line?

-ck

legendary

Legendary level

Activity: 4088

Merit: 1631

Ruu \o/

Just a few notes about cgminer that seem to be forgotten with scrypt...

Changing vectors does nothing.
Default lookup gap is 2, so setting 2 or 0 does nothing.
Default gpu threads are 2, so setting 2 does nothing.
Setting thread concurrency overrides shaders, so if you set thread concurrency, setting shaders does nothing.
Intensities over 13 for 79x0 just drops the hashrate or generates garbage so don't do that.
Magic core:mem ratios seem to be entirely hardware dependent: motherboard/CPU/GPU combos change it even for the same 79x0 device.
Magic core:mem ratios work much better on windows. On linux they don't seem to be anywhere near as effective.
Running CPU frequency scaling on linux (or the equivalent on windows) will slow down your GPU hashrate a little, so set your CPU to maximum performance equivalent.

Scratch

member

Activity: 84

Merit: 10

Quote from: meebs on March 14, 2013, 07:08:02 PM

Quote from: Flatlinezor on March 14, 2013, 09:11:40 AM

One thing is for sure, different shader amounts of different cards in one machine are not a good idea.

I can't for the love of god can make my 7970 work alongside a 7870 properly. The problem is NOT with the 7970, that hashes away 700-750 perfectly.

Are you running two different reaper instances?

I mine with a 7950 and a 7870 just fine.... 650 on the one and 400 on the other.

And by different instances I mean two completely seperate folders each configured seperately with a shortcut to each on the desktop

Try that out and let me know if it helps you at all...

ps. both cards are the tri-fan gigabyte models, not sure if that makes a difference...

Dont need two folders, just shortcut one to reaper1.conf which points to litecoin1.conf and the other to reaper2.conf which points to litecoin2.conf. eg: For my 5770 its "C:\Mining\REAPER\reaper.exe reaper57.conf"

meebs

hero member

Activity: 616

Merit: 500

Quote from: Flatlinezor on March 14, 2013, 09:11:40 AM

One thing is for sure, different shader amounts of different cards in one machine are not a good idea.

I can't for the love of god can make my 7970 work alongside a 7870 properly. The problem is NOT with the 7970, that hashes away 700-750 perfectly.

Are you running two different reaper instances?

I mine with a 7950 and a 7870 just fine.... 650 on the one and 400 on the other.

And by different instances I mean two completely seperate folders each configured seperately with a shortcut to each on the desktop

Try that out and let me know if it helps you at all...

ps. both cards are the tri-fan gigabyte models, not sure if that makes a difference...

tacotime

legendary

Legendary level

Activity: 1484

Merit: 1005

Updated cgminer settings for 7970

kronut

member

Activity: 86

Merit: 10

Thanks for sharing your settings, helps quite a bit switching over to litecoin with higher end cards.

I'll share my 6770 settings that get 200kh/s+ :

12.1 and SDK 2.6

"intensity" : "18",
"vectors" : "1,",
"worksize" : "256",
"kernel" : "scrypt",
"lookup-gap" : "2",
"thread-concurrency" : "4100",
"gpu-engine" : "960-960",
"gpu-memclock" : "1200",

Note that you cannot use the machine for anything else with i18, if you switch to i14 it's perfectly usable at 180kh/s.

tacotime

legendary

Legendary level

Activity: 1484

Merit: 1005

Quote from: Flatlinezor on March 14, 2013, 03:12:07 PM

No, you can use whatever you want with 7950. I'd suggest CGminer, you just have to tweak a couple of things. First of all, you Can't go over 13 intensity for starters. Set shaders, set vectors for 1, set lookup gap to 2.

For 7950 the sweet spot should be around 1.33 core to memory ratio.

Just used the new version of cgminer this morning, core:mem ratio of 0.68, only got 280 kh/s per card with all those settings. The 7970s and 7950s are very different with cgminer.

Flatlinezor

member

Activity: 84

Merit: 10

Funny quote

By the way, found a workaround to tweak my 7870 to acceptable levels, it is now doing 410. I had to install the mining stratum proxy to not lose shares as I'd do with normal reaper.

The 7870 key as it seems was to set vectors to 2. And by the way, I had to reorganize the PSU pcie and sata-->6pin molex-->6pin connectors, so the 7870 gets one dedicated pcie6 from the PSU, not just the 5v Rail ones. Now stability seems okay even at 20 intensity, so the driver restarts as a hunch, were indeed because of power management.

I really don't think i'd want to go higher now with the 7870, it is undervolted to 1.1 atm, might go lower, memory is at 1450 and core is 970. This is neat now. Whoever might struggle with a 7870, just try this, it'll surely work.

Already got a tip in the jar

)) Thanks!

Flatlinezor

member

Activity: 84

Merit: 10

Funny quote

No, you can use whatever you want with 7950. I'd suggest CGminer, you just have to tweak a couple of things. First of all, you Can't go over 13 intensity for starters. Set shaders, set vectors for 1, set lookup gap to 2.

For 7950 the sweet spot should be around 1.33 core to memory ratio.

tacotime

legendary

Legendary level

Activity: 1484

Merit: 1005

For 7950 use reaper

juve4v

hero member

Activity: 505

Merit: 500

Preliminary tests on my Sapphire 7950 doing 730 Mh/s but Im getting lots of HW errors

Anyone knows a fix ?

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